diff --git a/PROGRESS.md b/PROGRESS.md
index 0ea3cb3..df18cd1 100644
--- a/PROGRESS.md
+++ b/PROGRESS.md
@@ -2,7 +2,7 @@
 
 > 配合 `DESIGN.md`。本文件只记 phase 状态、决策偏差、文件量、下一步。每条 1-2 句:做了啥 + 关键判断;细节查 `git log` / `git diff` / `DESIGN §7.9`。
 
-最后更新:2026-06-07(前端模块化 Step 2:抽出 … / newtask / embed.js;main 1154 行)
+最后更新:2026-06-08(前端模块化 Step 2 完成:抽出 chat.js;main 75 行,路径 1 收官)
 
 ---
 
@@ -23,6 +23,7 @@
 
 ### 2026-06-06
 
+- **前端模块化 Step 2 收官:抽出 `chat.js`(对话视图)+ main.js 缩成 75 行入口**:最后也是最缠的一块——任务列表(浏览/筛选/滚动)+ selectTask 切换 + renderChatMeta/模型下拉 + renderMessages + live-run 助手 + sendMessage/cancel + fetchSse/handleSseEvent + 润色/粘贴文件 + 完成/废弃/删除/导出/清空(原 main.js 连续区 64–1132)→ `chat.js`(1086 行)。**决策:合一个 chat.js 而非强拆 tasks.js+stream.js**——读完依赖图确认二者共享 `state.liveRuns` + `chat-stream` DOM + run 生命周期,且 live-run 助手(renderLiveRunIfVisible/ensureRunningTaskSubscribed 等)被 selectTask 和 SSE 机器两边调用、骑墙;强拆会制造双向各 ~4-5 个 import 且边界不自然(用户已确认选合一)。导出 `loadTaskList`/`loadModels`/`selectTask`,embed/files/newtask 对这三个的 import 从 `./main.js` 改指 `./chat.js`;`formatUploadProgress` 加 export(粘贴上传进度用)。**chat 不调 enterApp → 与 main 无环**。`main.js` 仅留 `enterApp`(编排)+ `loadStorage` + Esc 关栈 + boot = **75 行入口**,import 精简到 11 行(layout/markdown/media 不再被 main 直接引用,但经 chat 仍在依赖图、副作用照常)。**校验升级**:除 node 全检 + import/export 一致性,新增**从 main BFS 的模块可达性检查**(14/14 可达,确保副作用模块不掉出图)。dev.html 4087 行单文件 → 14 个零构建 ES module + 纯 HTML;main 2719→75。**路径 1(拆文件)完成**,后续可按需进路径 2(给 chat/files 等局部引 Alpine/petite-vue 响应式)。
 - **前端模块化 Step 2:抽出 `embed.js`(iframe 模式)**:父页面经 postMessage 推 token 进入应用 + 401 重签(原 main.js 1147–1209 + 顶层 `_embedInitialTaskHandled` 一次性标志)→ `embed.js`(75 行)。导出 `embedInit`(boot 调)+ `embedPostToParent`/`embedShowWaiting`(auth 的 logout 在 embed 下通知父页面/显示等待态)——后两个从 main 迁出后,`auth.js` 对它们的 import 从 `./main.js` 改指 `./embed.js`(auth 仍从 main import enterApp)。反向 import main glue `enterApp`/`loadTaskList`/`selectTask`。main↔embed、auth↔embed 均运行时调用环,安全。main.js 删至 **1154 行**(2719 行起,已搬出约 58%)。node 全检过、import/export 一致性过、静态测试 2 过。剩 main 内:`enterApp` glue + tasks(列表/选择/渲染消息)+ stream(发送/SSE)+ boot + Esc 关栈,待最后一并处理 tasks+stream。
 - **前端模块化 Step 2:抽出 `newtask.js`(新建任务弹框)**:任务名 / 工作目录(新建 sentinel 或复用已有 + 二级 input 联动)/ 描述 / skill / 模型 select,提交 `POST /v1/tasks`(原 main.js 1146–1320)→ `newtask.js`(186 行)。顶层自绑 hd-new 打开 / nt-go 提交 / 各 input 联动;唯一对外导出 `loadFolderSuggestions`(供 main enterApp 初始化顶部 filter-wd、files 复制/移动后刷目录)——它从 main 迁来后,`files.js` 对它的 import 从 `./main.js` 改指 `./newtask.js`。反向 import main glue `loadModels`(加 `export`)/`loadTaskList`/`selectTask` + `logout`(auth)。main.js 删至 1220 行。node 全检过、import/export 一致性校验过、私有符号清零。
 - **前端模块化 Step 2:抽出 `media.js`(工具活动标签 + artifact 抽取/渲染)+ 收敛 downloadFile 反向依赖**:对话内 `toolActivityLabel`(工具调用→中文活动名)、`extractArtifactRels`(从结果文本/working_dir 提产物路径)、`extractMediaBanner`(seedream/seedance 横幅)、`renderArtifactBarHtml`(产物 chip 条 + 图/视频内联占位)、`upgradeMediaArtifacts`(占位异步 fetch blob 填 `<img>`/`<video>` 带缓存)、`downloadFile`(blob 下载)→ `media.js`(237 行,原 main.js 1134–1359)。**收敛点**:downloadFile 移入 media 后,`preview.js`/`files.js` 对它的 import 从 `./main.js` 改指 `./media.js` —— 把这条反向依赖从 main 挪开。media 导入极少(`escapeHtml`/`_categorize`(preview)/`state`/`logout`),与 preview 成 media↔preview 环(均运行时调用,安全)。**两次险漏靠校验抓回**:① 共享 const `ARTIFACT_PRODUCING_TOOLS`(main renderMessages/SSE 用 4 处,`.has()` 访问非函数调用,"被调标识符"法漏掉)② 内部函数 `_flushMediaArtifactCache`(selectTask 切任务清缓存用)—— 残留符号检查发现后补 export。新增**全模块 import/export 一致性校验脚本**(每个 `import{X}` 必在目标 `export`),11 模块全过。main.js 删至 1393 行。`node --check` 11 模块全过、静态测试 2 过。
diff --git a/web/static/js/chat.js b/web/static/js/chat.js
new file mode 100644
index 0000000..635cc57
--- /dev/null
+++ b/web/static/js/chat.js
@@ -0,0 +1,1086 @@
+// 对话视图(任务列表 + 选择/渲染消息 + 发送/SSE 流式 + 任务生命周期):
+// 任务列表浏览/筛选/滚动加载、selectTask 切换、renderChatMeta、模型下拉、
+// renderMessages、live-run 助手、sendMessage/cancel、fetchSse/handleSseEvent、
+// 润色/粘贴文件、完成/废弃/删除/导出/清空。共享 state.liveRuns + chat-stream DOM。
+// 各入口模块顶层自绑;对外导出 loadTaskList / loadModels / selectTask
+// (供 main enterApp、embed、files、newtask)。
+import { state } from "./state.js";
+import { $, showMenu } from "./dom.js";
+import { api } from "./api.js";
+import { escapeHtml, fmtTime, fmtTokens, fmtTimeAgo, taskUsageTooltip, formatTaskUsage, formatContextStats, formatUsageStats } from "./format.js";
+import { renderMd, highlightIn } from "./markdown.js";
+import { mqPhone, setMobileView } from "./layout.js";
+import { logout } from "./auth.js";
+import { openFilePreview, openPasteFilePreview, closePreviewIfShowing } from "./preview.js";
+import { loadFiles, scheduleFilesRefresh, uploadFiles, formatUploadProgress } from "./files.js";
+import { toolActivityLabel, _workingDirName, extractMediaBanner, extractArtifactRels, renderArtifactBarHtml, upgradeMediaArtifacts, ARTIFACT_PRODUCING_TOOLS, _flushMediaArtifactCache } from "./media.js";
+
+export async function loadModels() {
+  try {
+    const data = await api("GET", "/v1/models");
+    state.models = data.models || [];
+  } catch (e) {
+    state.models = [];  // 静默兜底:无模型清单时下拉不显示,不挡正常流程
+  }
+  try {
+    const data = await api("GET", "/v1/image_models");
+    state.imageModels = data.models || [];
+    // 默认锁定第一个(=agent_builder fallback);用户后续切换就会更新
+    if (!state.imageModel) {
+      const def = state.imageModels.find(m => m.is_default) || state.imageModels[0];
+      state.imageModel = def ? def.variant : "";
+    }
+  } catch (e) {
+    state.imageModels = [];
+    state.imageModel = "";
+  }
+  try {
+    const data = await api("GET", "/v1/video_models");
+    state.videoModels = data.models || [];
+    if (!state.videoModel) {
+      const def = state.videoModels.find(m => m.is_default) || state.videoModels[0];
+      state.videoModel = def ? def.variant : "";
+    }
+  } catch (e) {
+    state.videoModels = [];
+    state.videoModel = "";
+  }
+  // embed + task_id 场景下 selectTask 可能在 loadModels 完成前就跑完 renderChatMeta,
+  // 此时 models 为空 → 模型下拉不渲染。loadModels 收尾时如果已选中 task,补一次 chat-meta 重渲。
+  if (state.taskMeta) renderChatMeta();
+}
+
+// loadTaskList:默认 reset(filters/refresh/写操作后),append=true 由 sentinel observer 触发
+// 并发模型:append 受 taskLoading 互斥(避免观察器重复触发);reset 永远抢占,用 seq 丢弃过期响应
+let _taskLoadSeq = 0;
+export async function loadTaskList({ append = false } = {}) {
+  if (append && (state.taskLoading || !state.taskHasMore)) return;
+  const mySeq = ++_taskLoadSeq;
+  const nextPage = append ? state.taskPage + 1 : 1;
+  const params = new URLSearchParams();
+  params.set("page", nextPage);
+  params.set("page_size", state.taskPageSize);
+  const st = $("filter-status").value;
+  if (st) params.set("status", st);
+  const q = $("filter-q").value.trim();
+  if (q) params.set("q", q);
+  const wd = $("filter-wd").value.trim();
+  if (wd) params.set("working_dir", wd);
+  const ord = $("filter-order").value;
+  if (ord && ord !== "-created_at") params.set("ordering", ord);  // 默认值不发送,URL 更干净
+  state.taskLoading = true;
+  setSentinel(append ? "加载中…" : "");
+  try {
+    const data = await api("GET", "/v1/tasks?" + params.toString());
+    if (mySeq !== _taskLoadSeq) return;  // 已被更新的请求 supersede,丢弃
+    state.taskTotal = data.count || 0;
+    state.taskPage = data.page || nextPage;
+    state.taskPageSize = data.page_size || state.taskPageSize;
+    const results = data.results || [];
+    if (!append) state.taskLoaded = 0;
+    state.taskLoaded += results.length;
+    state.taskHasMore = state.taskLoaded < state.taskTotal;
+    renderTaskList(results, append);
+    renderTaskCount();
+  } catch (e) {
+    if (mySeq !== _taskLoadSeq) return;
+    if (e.status === 401) { logout(); return; }
+    if (!append) {
+      $("task-list").innerHTML = `<div class="empty">加载失败:${escapeHtml(e.message)}</div>`;
+      state.taskHasMore = false;
+    }
+    setSentinel(`加载失败:${e.message}`);
+  } finally {
+    if (mySeq === _taskLoadSeq) state.taskLoading = false;
+  }
+}
+
+function renderTaskCount() {
+  $("task-count").textContent = state.taskTotal > 0 ? `共 ${state.taskTotal} 个` : "";
+  if (state.taskTotal === 0) setSentinel("");
+  else if (!state.taskHasMore) setSentinel(state.taskPage > 1 ? "— 已加载全部 —" : "");
+  else setSentinel("");  // 还有更多 → 留空,observer 触发时再填"加载中"
+}
+
+function setSentinel(text) {
+  $("task-sentinel").textContent = text || "";
+}
+
+function renderTaskList(tasks, append = false) {
+  if (!append) state.tasksById = {};
+  for (const t of tasks) state.tasksById[t.task_id] = t;
+  if (!append && !tasks.length) {
+    $("task-list").innerHTML = `<div class="empty">(暂无任务)</div>`;
+    return;
+  }
+  if (append && !tasks.length) return;  // 末页空 batch,不动 DOM
+  const statusLabels = { active: "进行中", completed: "已完成", abandoned: "已废弃" };
+  const html = tasks.map((t) => {
+    const active = state.taskId === t.task_id ? " active" : "";
+    // 主行 = 任务名(必填字段);副行 = 工作目录 + description(都按需显示)
+    const taskName = t.name || "(未命名)";
+    const wdName = t.working_dir ? t.working_dir.split("/").filter(Boolean).pop() : "";
+    const desc = t.description || "";
+    const statusLabel = statusLabels[t.status] || t.status;
+    const rowTitle = `${taskName}\n${t.task_id}`;  // hover 出全名 + 完整 id(替代 meta 里被去掉的 id8)
+    return `
+      <div class="task-row${active}" data-tid="${t.task_id}" title="${escapeHtml(rowTitle)}" style="display:flex;align-items:flex-start;gap:6px;">
+        <div style="flex:1;min-width:0;">
+          <div class="desc">${escapeHtml(taskName)}</div>
+          ${wdName ? `<div class="meta muted" title="${escapeHtml(t.working_dir || "")}" style="display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;">📁 ${escapeHtml(wdName)}</div>` : ""}
+          ${desc ? `<div class="meta muted" title="${escapeHtml(desc)}" style="display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;">${escapeHtml(desc)}</div>` : ""}
+          <div class="meta">
+            <span class="badge ${t.status}">${statusLabel}</span>
+            ${t.skill ? `<span class="muted" title="${escapeHtml(t.skill)}">${escapeHtml(t.skill)}</span>` : ""}
+            <span class="num right-group">${t.n_messages || 0} 条</span>
+            <span class="num" title="${escapeHtml(taskUsageTooltip(t))}">${fmtTokens(t.tokens)} tok</span>
+            <span class="muted time-ago" title="${escapeHtml(fmtTime(t.updated_at))}">${escapeHtml(fmtTimeAgo(t.updated_at))}</span>
+          </div>
+        </div>
+        <button class="dd-toggle task-menu" data-tid="${t.task_id}" title="任务操作">⋯</button>
+      </div>
+    `;
+  }).join("");
+  const listEl = $("task-list");
+  let newRows;
+  if (append) {
+    const tmp = document.createElement("div");
+    tmp.innerHTML = html;
+    newRows = Array.from(tmp.children);
+    newRows.forEach((el) => listEl.appendChild(el));
+  } else {
+    listEl.innerHTML = html;
+    newRows = Array.from(listEl.querySelectorAll(".task-row"));
+  }
+  newRows.forEach((el) => {
+    if (!el.classList || !el.classList.contains("task-row")) return;
+    el.onclick = (e) => {
+      if (e.target.closest(".dd-toggle")) return;  // 菜单按钮点击不触发选中
+      selectTask(el.dataset.tid);
+    };
+    const btn = el.querySelector(".task-menu");
+    if (btn) {
+      btn.onclick = (e) => {
+        e.stopPropagation();
+        const t = state.tasksById[btn.dataset.tid];
+        if (!t) return;
+        showMenu(btn, taskMenuItems(t));
+      };
+    }
+  });
+}
+
+function taskMenuItems(t) {
+  const isActive = t.status === "active";
+  const hasMsg = (t.n_messages || 0) > 0;
+  return [
+    { act: "complete", label: "完成",       cls: "act-complete", disabled: !isActive,
+      onclick: () => setTaskStatus(t.task_id, "completed", t.name || "(未命名)") },
+    { act: "abandon",  label: "废弃",       cls: "act-abandon",  disabled: !isActive,
+      onclick: () => setTaskStatus(t.task_id, "abandoned", t.name || "(未命名)") },
+    { act: "export",   label: "导出对话记录",  cls: "act-export",   disabled: !hasMsg,
+      onclick: () => exportTask(t.task_id) },
+    { act: "delete",   label: "删除",       cls: "act-delete",
+      onclick: () => deleteTask(t.task_id, t.name || "(未命名)", t.n_messages || 0) },
+  ];
+}
+
+// 筛选 / 排序 / 刷新 一律 reset(loadTaskList 默认 append=false);追加由 sentinel observer 触发
+$("filter-status").onchange = () => loadTaskList();
+$("filter-order").onchange = () => loadTaskList();
+$("filter-wd").onchange = () => loadTaskList();   // select 选完立即筛
+$("btn-refresh-tasks").onclick = () => loadTaskList();
+
+// 搜索 q 是 text input → 300ms debounce 避免每字符打 API
+let _filterDebounce = null;
+$("filter-q").addEventListener("input", () => {
+  clearTimeout(_filterDebounce);
+  _filterDebounce = setTimeout(() => loadTaskList(), 300);
+});
+
+// 滚动加载:只让 task 列表区域滚,顶部标题 / 新建 / 筛选 / 排序固定。
+// rootMargin 提前 200px 触发,体感更顺;阈值 0 即可(刚进入即触发,append 期间 taskLoading 自带防抖)
+const _taskScrollObserver = new IntersectionObserver((entries) => {
+  if (entries[0].isIntersecting && state.taskHasMore && !state.taskLoading) {
+    loadTaskList({ append: true });
+  }
+}, { root: $("task-scroll"), rootMargin: "200px 0px" });
+_taskScrollObserver.observe($("task-sentinel"));
+
+// ───── select task ─────
+export async function selectTask(tid) {
+  if (state.evtSrc) { state.evtSrc.close(); state.evtSrc = null; }
+  // 切 task 清掉上个 task 累积的 inline media blob URL — 新 task 的 rel 不同,
+  // 旧 URL 留着只占内存。同 task 切回(tid === state.taskId)不算切换,跳过。
+  if (state.taskId && state.taskId !== tid) _flushMediaArtifactCache();
+  state.taskId = tid;
+  document.querySelectorAll(".task-row").forEach((el) => {
+    el.classList.toggle("active", el.dataset.tid === tid);
+  });
+  // 手机视图:选中任务自动切到对话面板(桌面 mqPhone 不命中 → no-op)
+  if (mqPhone.matches) setMobileView("mv-mid");
+  try {
+    const meta = await api("GET", "/v1/tasks/" + tid);
+    state.taskMeta = meta;
+    renderChatMeta();
+    await loadMessages();
+    if (meta.run_status === "running" || meta.run_status === "cancelling") {
+      ensureRunningTaskSubscribed(tid, `/v1/tasks/${tid}/events`);
+    } else {
+      renderLiveRunIfVisible();
+    }
+    // 文件面板自动跳到该 task 的 working_dir(user_root 下一级子目录),
+    // 不强绑定 — 用户可点 crumb 回上层看 user_root 其他目录
+    const wdName = meta.working_dir ? meta.working_dir.split("/").filter(Boolean).pop() : "";
+    state.filesPath = wdName || "";
+    await loadFiles();
+    refreshConcurrentWarnings();  // 同 wd 其他 task 活跃软警告 — 后台 fire-and-forget
+  } catch (e) {
+    if (e.status === 401) { logout(); return; }
+    $("chat-stream").innerHTML = `<div class="empty">加载失败:${escapeHtml(e.message)}</div>`;
+  }
+}
+
+// 拉同 wd 内除自己外仍 running/cancelling 的 task,渲染软警告 banner。
+// 同 wd 多 task 同时跑频率近 0(用户工作流以"同项目对话历史轨迹"为主,不并发),
+// 这里只做提示,不挡发送(对应 DESIGN §7.8 / §7.9 "信任 + 软警告 + 承认边界")。
+async function refreshConcurrentWarnings() {
+  const t = state.taskMeta;
+  if (!t || !t.working_dir) { state.concurrentWarnings = []; renderConcurrentWarning(); return; }
+  const wdName = t.working_dir.split("/").filter(Boolean).pop();
+  if (!wdName) { state.concurrentWarnings = []; renderConcurrentWarning(); return; }
+  const params = new URLSearchParams();
+  params.set("working_dir", wdName);
+  params.set("run_status", "running,cancelling");
+  params.set("page_size", "10");
+  try {
+    const data = await api("GET", "/v1/tasks?" + params.toString());
+    const others = (data.results || []).filter(r => r.task_id !== t.task_id);
+    state.concurrentWarnings = others;
+  } catch (e) {
+    // 警告失败不影响主功能,静默
+    state.concurrentWarnings = [];
+  }
+  renderConcurrentWarning();
+}
+
+function renderConcurrentWarning() {
+  const el = $("wd-concurrent-warn");
+  const others = state.concurrentWarnings;
+  if (!others || others.length === 0) { el.style.display = "none"; el.innerHTML = ""; return; }
+  const head = others[0];
+  const t = state.taskMeta;
+  const wdName = t && t.working_dir ? t.working_dir.split("/").filter(Boolean).pop() : "";
+  const more = others.length > 1 ? ` 等 ${others.length} 个` : "";
+  el.innerHTML = `⚠ 项目 "${escapeHtml(wdName)}" 内 task <span class="tname">${escapeHtml(head.name || "(未命名)")}</span> 正在 <span class="rs">${escapeHtml(head.run_status)}</span>${more} — 并发写同名中间产物可能互覆,建议等它结束再发`;
+  el.style.display = "block";
+}
+
+function renderChatMeta() {
+  const t = state.taskMeta;
+  if (!t) { $("chat-meta").innerHTML = `<span class="muted">(未选中任务)</span>`; return; }
+  const wdName = t.working_dir ? t.working_dir.split("/").filter(Boolean).pop() : "";
+  const taskName = t.name || "(未命名)";
+  const statusLabel = { active: "进行中", completed: "已完成", abandoned: "已废弃" }[t.status] || t.status;
+  // wdName 与 taskName 相同时(留空 fallback,多数场景)不重复显示 📁;
+  // 不同时(用户显式指定共享目录 / 改了 name)才挂 📁,提示"项目归属"
+  const wdBadge = (wdName && wdName !== taskName)
+    ? `<span class="muted" title="${escapeHtml(t.working_dir)}">📁 ${escapeHtml(wdName)}</span>`
+    : "";
+  $("chat-meta").innerHTML = `
+    <span style="font-weight:600;" title="${escapeHtml(taskName)}">${escapeHtml(taskName)}</span>
+    <span class="badge ${t.status}">${statusLabel}</span>
+    ${wdBadge}
+    ${t.skill ? `<span class="muted">${escapeHtml(t.skill)}</span>` : ""}
+    <span class="tid">${t.task_id.slice(0, 8)}</span>
+    ${formatTaskUsage(t)}
+    ${t.description ? `<span class="muted desc">${escapeHtml(t.description)}</span>` : ""}
+    <span class="spacer"></span>
+    ${renderModelDropdown(t)}
+    ${renderImageModelDropdown()}
+    ${renderVideoModelDropdown()}
+  `;
+  const sel = $("chat-model-sel");
+  if (sel) sel.onchange = onChangeModel;
+  const imgSel = $("chat-image-model-sel");
+  if (imgSel) imgSel.onchange = onChangeImageModel;
+  const vidSel = $("chat-video-model-sel");
+  if (vidSel) vidSel.onchange = onChangeVideoModel;
+  const active = t.status === "active";
+  $("chat-form").style.display = active ? "flex" : "none";
+  syncOptimizeBtn();
+  $("btn-done").disabled = !active;
+  $("btn-abandon").disabled = !active;
+  $("btn-delete-task").disabled = false;  // delete 不限 status(用户显式 confirm)
+  // 导出 / 清空:只要选中 task 就允许点(不按 n_messages 门禁 —— 历史 bug:
+  // 清空后 n_messages=0 disable,但新对话进来后 taskMeta 不重渲一直 disable;
+  // 0 条时点击不会出错(导出空 docx / 清空 confirm 显 0 条),让 UX 一致更省心)。
+  $("btn-export").disabled = false;
+  // 清空对话:仅活跃 run 期间禁用(后端 409,confirm 通过后才报错 UX 差)
+  const running = t.run_status === "running" || t.run_status === "cancelling";
+  $("btn-clear-msgs").disabled = running;
+}
+
+function renderModelDropdown(t) {
+  // 模型清单未加载好(或为空)时不渲染下拉,但 task 仍可正常用(后端走 task.model_profile)
+  if (!state.models || state.models.length === 0) return "";
+  const cur = t.model_profile || "";
+  const opts = state.models.map(m =>
+    `<option value="${escapeHtml(m.profile)}" ${m.profile === cur ? "selected" : ""}>${escapeHtml(m.display_name)}</option>`
+  ).join("");
+  return `<span class="muted small mdl-wrap" style="display:inline-flex;align-items:center;gap:4px;"><span class="mdl-text">模型</span><span class="mdl-icon" aria-hidden="true">💬</span><select id="chat-model-sel" class="small" style="width:auto;padding:1px 4px;font-size:12px;" title="切换 task 模型(下条消息生效)">${opts}</select></span>`;
+}
+
+function renderImageModelDropdown() {
+  // imageModels 为空(yaml 无 image variant)→ 不画下拉。注意不依赖 ARK_API_KEY 是否设了
+  // —— 这里只是展示元数据,真正调用时 backend 那边没 key 自然 tool 不挂(用户不会
+  // 在没 key 的环境点出图,prompt 里 seedream 工具压根不在 schema)。
+  if (!state.imageModels || state.imageModels.length === 0) return "";
+  const cur = state.imageModel || "";
+  const opts = state.imageModels.map(m =>
+    `<option value="${escapeHtml(m.variant)}" ${m.variant === cur ? "selected" : ""}>${escapeHtml(m.display_name)}</option>`
+  ).join("");
+  return `<span class="muted small mdl-wrap" style="display:inline-flex;align-items:center;gap:4px;"><span class="mdl-text">生图</span><span class="mdl-icon" aria-hidden="true">🖼</span><select id="chat-image-model-sel" class="small" style="width:auto;padding:1px 4px;font-size:12px;" title="下一条消息触发生图时使用的模型(本地选择,不入库)">${opts}</select></span>`;
+}
+
+function onChangeImageModel(ev) {
+  // 纯前端 state,不 PATCH;选中值随下一次 POST /v1/tasks/{id}/messages 的 image_model 字段一起发
+  state.imageModel = ev.target.value || "";
+  $("chat-hint").textContent = `生图模型 → ${ev.target.options[ev.target.selectedIndex].text}`;
+}
+
+function renderVideoModelDropdown() {
+  // 同 renderImageModelDropdown:videoModels 为空 → 不画。yaml 无 video 段 / 后端
+  // /v1/video_models 返空时下拉不出现,seedance tool 也不会在 schema 里。
+  if (!state.videoModels || state.videoModels.length === 0) return "";
+  const cur = state.videoModel || "";
+  const opts = state.videoModels.map(m =>
+    `<option value="${escapeHtml(m.variant)}" ${m.variant === cur ? "selected" : ""}>${escapeHtml(m.display_name)}</option>`
+  ).join("");
+  return `<span class="muted small mdl-wrap" style="display:inline-flex;align-items:center;gap:4px;"><span class="mdl-text">生视频</span><span class="mdl-icon" aria-hidden="true">🎬</span><select id="chat-video-model-sel" class="small" style="width:auto;padding:1px 4px;font-size:12px;" title="下一条消息触发生视频时使用的模型(本地选择,不入库)">${opts}</select></span>`;
+}
+
+function onChangeVideoModel(ev) {
+  state.videoModel = ev.target.value || "";
+  $("chat-hint").textContent = `生视频模型 → ${ev.target.options[ev.target.selectedIndex].text}`;
+}
+
+async function onChangeModel(ev) {
+  const sel = ev.target;
+  const newProfile = sel.value;
+  const t = state.taskMeta;
+  if (!t || !newProfile || newProfile === t.model_profile) return;
+  const oldProfile = t.model_profile || "";
+  try {
+    const updated = await api("PATCH", `/v1/tasks/${t.task_id}`, { model_profile: newProfile });
+    state.taskMeta = updated;
+    const running = updated.run_status === "running" || updated.run_status === "cancelling";
+    $("chat-hint").textContent = running
+      ? `已切到 ${newProfile} · 当前 run 跑完后生效`
+      : `已切到 ${newProfile}`;
+  } catch (e) {
+    sel.value = oldProfile;  // PATCH 失败 UI 回滚
+    $("chat-hint").textContent = `切换失败:${e.message}`;
+  }
+}
+
+async function loadMessages() {
+  const data = await api("GET", `/v1/tasks/${state.taskId}/messages`);
+  renderMessages(data.messages);
+}
+
+function getLiveRun(taskId) {
+  return taskId ? state.liveRuns.get(taskId) : null;
+}
+
+function isCurrentTaskStreaming() {
+  return !!getLiveRun(state.taskId);
+}
+
+function createLiveAssistantCard(run) {
+  const card = document.createElement("div");
+  card.className = "msg assistant live-run";
+  card.innerHTML = `<div class="role">助手</div><div class="body streaming">${run.acc ? renderMd(run.acc) : ""}</div>`;
+  run.card = card;
+  run.body = card.querySelector(".body");
+  return card;
+}
+
+function renderLiveRunIfVisible() {
+  const run = getLiveRun(state.taskId);
+  if (!run) {
+    setActionMode("idle");
+    return;
+  }
+  const wrap = $("chat-stream");
+  const card = run.card || createLiveAssistantCard(run);
+  if (run.body && run.acc) run.body.innerHTML = renderMd(run.acc);
+  if (card.parentElement !== wrap) wrap.appendChild(card);
+  wrap.scrollTop = wrap.scrollHeight;
+  setActionMode(run.cancelling ? "cancelling" : "streaming");
+  $("chat-hint").textContent = run.cancelling ? "停止中…" : "接收中…";
+}
+
+function ensureRunningTaskSubscribed(taskId, url) {
+  if (!taskId || getLiveRun(taskId)) return;
+  const run = {
+    taskId,
+    url,
+    acc: "",
+    pending: false,
+    seenRels: new Set(),
+    terminal: false,
+    card: null,
+    body: null,
+    cancelling: state.taskMeta && state.taskMeta.run_status === "cancelling",
+    workingDir: state.taskMeta && state.taskMeta.working_dir,
+  };
+  state.liveRuns.set(taskId, run);
+  state.streaming = true;
+  renderLiveRunIfVisible();
+  streamSse(url, run);
+}
+
+function setRunHint(run, text) {
+  if (state.taskId === run.taskId) $("chat-hint").textContent = text;
+}
+
+function renderMessages(msgs) {
+  const wrap = $("chat-stream");
+  wrap.innerHTML = "";
+  if (!msgs.length) {
+    wrap.innerHTML = `<div class="empty">(暂无消息 · 在下方输入开始对话)</div>`;
+    renderLiveRunIfVisible();
+    return;
+  }
+  // 模型切换点小标:assistant 行的 model_profile 与上一个 assistant 不同就插一行分隔
+  // (含首条);避免每条都标制造噪声。空 model_profile(历史旧数据)不画。
+  let lastAsstModel = null;
+  // chip 去重:同一路径在 tool 结果里挂过 inline 图后,assistant 正文 echo 同路径不再重挂。
+  // chronological 遍历,首次出现保留(tool 结果常在前),后续重复过滤掉。
+  const seenRels = new Set();
+  const pickFresh = (rels) => {
+    const fresh = [];
+    for (const r of rels) {
+      if (seenRels.has(r)) continue;
+      seenRels.add(r);
+      fresh.push(r);
+    }
+    return fresh;
+  };
+  for (const m of msgs) {
+    const p = m.payload || {};
+    const role = p.role || "?";
+    if (role === "system") continue;  // 不显示 system
+    if (role === "assistant" && m.model_profile && m.model_profile !== lastAsstModel) {
+      const dn = (state.models.find(x => x.profile === m.model_profile) || {}).display_name || m.model_profile;
+      const sep = document.createElement("div");
+      sep.className = "model-switch muted";
+      sep.style.cssText = "margin:8px 0;text-align:center;font-size:11px;letter-spacing:0.5px;";
+      sep.textContent = `── ${dn} ──`;
+      wrap.appendChild(sep);
+      lastAsstModel = m.model_profile;
+    }
+    if (role === "tool") {
+      // 嵌进上一个 assistant 的 tool_call(简化:直接独立显示)
+      const card = document.createElement("div");
+      card.className = "msg tool";
+      const txt = typeof p.content === "string" ? p.content : JSON.stringify(p.content);
+      const wd = _workingDirName(state.taskMeta && state.taskMeta.working_dir);
+      const banner = extractMediaBanner(p.name || "", txt || "");
+      // 工具结果只有产物工具(seedream/seedance)挂 chip + inline 大图;通用工具
+      // (grep/read/glob/shell)echo 的路径是"引用"不是"产物",不挂以免噪声。
+      const isProducer = ARTIFACT_PRODUCING_TOOLS.has(p.name || "");
+      const rels = isProducer ? pickFresh(extractArtifactRels(txt || "", wd)) : [];
+      card.innerHTML = `
+        <div class="role">工具调用 · ${escapeHtml(p.name || "")}</div>
+        <details class="tool-call"><summary>结果(${(txt || "").length} 字符)${banner}</summary><pre>${escapeHtml(txt || "")}</pre></details>
+        ${renderArtifactBarHtml(rels, isProducer)}
+      `;
+      wrap.appendChild(card);
+      continue;
+    }
+    const card = document.createElement("div");
+    card.className = "msg " + role;
+    const roleLabel = { user: "我", assistant: "助手", error: "错误" }[role] || role;
+    let html = `<div class="role">${roleLabel}</div>`;
+    if (typeof p.content === "string" && p.content) {
+      html += `<div class="body">${renderMd(p.content)}</div>`;
+      // assistant 正文里 echo 的 <wd>/... 路径**永远**挂 chip(绕开 seenRels —— 上面
+      // tool 结果可能 inline 过同图,但 chip 是小按钮无视觉污染,助手回复里有可
+      // 点的"产物锚点"比没有好);强制 allowInlineMedia=false 防止大图被重复 inline。
+      if (role === "assistant") {
+        const wd = _workingDirName(state.taskMeta && state.taskMeta.working_dir);
+        html += renderArtifactBarHtml(extractArtifactRels(p.content, wd), false);
+      }
+    }
+    if (Array.isArray(p.tool_calls) && p.tool_calls.length) {
+      const wd = _workingDirName(state.taskMeta && state.taskMeta.working_dir);
+      for (const tc of p.tool_calls) {
+        const fn = (tc.function && tc.function.name) || "?";
+        let argsObj = {};
+        let args = "";
+        try {
+          argsObj = JSON.parse((tc.function && tc.function.arguments) || "{}");
+          args = JSON.stringify(argsObj, null, 2);
+        } catch (e) { args = (tc.function && tc.function.arguments) || ""; }
+        const label = toolActivityLabel(fn, argsObj);
+        const isProducer = ARTIFACT_PRODUCING_TOOLS.has(fn);
+        const rels = isProducer ? pickFresh(extractArtifactRels(args, wd)) : [];
+        html += `
+          <details class="tool-call"><summary>${escapeHtml(label)}</summary><pre>${escapeHtml(args)}</pre></details>
+          ${renderArtifactBarHtml(rels, isProducer)}
+        `;
+      }
+    }
+    card.innerHTML = html;
+    highlightIn(card);
+    wrap.appendChild(card);
+  }
+  wrap.scrollTop = wrap.scrollHeight;
+  upgradeMediaArtifacts(wrap);
+  renderLiveRunIfVisible();
+}
+
+// ───── send + SSE ─────
+// 发送 / 停止 单按钮:idle → 发送(primary 红实心);streaming → 停止(danger 红边);
+// cancelling 是过渡态 — 用户点过停止后到 SSE 收到 cancelled/done 之间。
+function setActionMode(mode) {
+  const btn = $("chat-action");
+  btn.classList.remove("primary", "danger");
+  if (mode === "idle") {
+    btn.textContent = "发送";
+    btn.classList.add("primary");
+    btn.disabled = false;
+    btn.title = "";
+  } else if (mode === "streaming") {
+    btn.textContent = "停止";
+    btn.classList.add("danger");
+    btn.disabled = false;
+    btn.title = "停止当前流式回复";
+  } else if (mode === "cancelling") {
+    btn.textContent = "停止中…";
+    btn.classList.add("danger");
+    btn.disabled = true;
+  }
+}
+
+function chatAction() {
+  if (isCurrentTaskStreaming()) cancelCurrentTask();
+  else sendMessage();
+}
+
+$("chat-form").addEventListener("submit", (e) => { e.preventDefault(); chatAction(); });
+$("chat-input").addEventListener("keydown", (e) => {
+  // streaming 期间 Enter 不触发停止 —— 用户可能正在编辑下一条草稿,误触发风险高
+  if (e.key === "Enter" && !e.shiftKey) {
+    e.preventDefault();
+    if (!isCurrentTaskStreaming()) sendMessage();
+  }
+});
+$("chat-input").addEventListener("input", syncOptimizeBtn);
+// 粘贴含文件 → 直接上传到当前目录(复用拖拽通路);纯文本走默认
+// 反馈走 chat-hint:上传中 → 已粘贴 + chip;下一次发送会自然覆盖为"发送中…"。
+$("chat-input").addEventListener("paste", async (e) => {
+  const files = Array.from(e.clipboardData?.files || []);
+  if (!files.length) return;
+  e.preventDefault();
+  const hint = $("chat-hint");
+  const prevHint = hint.textContent;
+  hint.textContent = files.length === 1 ? `上传中:${files[0].name}…` : `上传中:${files.length} 个文件…`;
+  const saved = await uploadFiles(files, {
+    onProgress: (loaded, total) => {
+      hint.textContent = formatUploadProgress(files, loaded, total);
+    },
+  });
+  if (saved && saved.length) {
+    hint.innerHTML = `已粘贴 ${renderPasteFileChips(saved)} <span class="muted">可在右侧文件处查看</span>`;
+  } else {
+    hint.textContent = prevHint;  // 失败 alert 已弹,hint 回原
+  }
+});
+
+function renderPasteFileChips(saved) {
+  return (saved || []).map((f) => {
+    const rel = f.rel || f.name || "";
+    const name = f.name || (rel.split("/").pop() || rel);
+    return `<span class="paste-chip-wrap" data-rel="${escapeHtml(rel)}"><button type="button" class="art-chip paste-chip" data-rel="${escapeHtml(rel)}" title="${escapeHtml(rel)} · 点击预览">${escapeHtml(name)}</button><button type="button" class="paste-chip-del" data-rel="${escapeHtml(rel)}" title="删除该粘贴文件">×</button></span>`;
+  }).join("");
+}
+
+$("chat-hint").addEventListener("click", (e) => {
+  const del = e.target.closest && e.target.closest(".paste-chip-del[data-rel]");
+  if (del) {
+    e.stopPropagation();
+    deletePastedFile(del.dataset.rel, del.closest(".paste-chip-wrap"));
+    return;
+  }
+  const chip = e.target.closest && e.target.closest(".paste-chip[data-rel]");
+  if (!chip) return;
+  const rel = chip.dataset.rel;
+  if (rel) openPasteFilePreview(rel);
+});
+
+async function deletePastedFile(rel, wrap) {
+  if (!rel || !wrap) return;
+  const btn = wrap.querySelector(".paste-chip-del");
+  if (btn) btn.disabled = true;
+  try {
+    await api("POST", "/v1/files/delete", { path: rel, recursive: false });
+    closePreviewIfShowing(rel);
+    wrap.remove();
+    await loadFiles();
+    const hint = $("chat-hint");
+    if (!hint.querySelector(".paste-chip-wrap")) {
+      hint.innerHTML = `<span class="muted">已删除粘贴文件</span>`;
+    }
+  } catch (e) {
+    if (btn) btn.disabled = false;
+    if (e.status === 401) { logout(); return; }
+    alert("删除失败:" + e.message);
+  }
+}
+
+// 润色:同步调后端,把 textarea 内容替成优化后文本。用 execCommand('insertText')
+// 接 textarea 原生 undo 栈 — Ctrl+Z 一次回到原文。streaming 期间允许并行(后端
+// 不与主对话 run 互斥,各跑各的 LLM)。
+function syncOptimizeBtn() {
+  const btn = $("chat-optimize");
+  if (!btn) return;
+  if (state.optimizing) return;  // 进行中不在这条路径切
+  const has = ($("chat-input").value || "").trim().length > 0;
+  btn.disabled = !has || !state.taskId;
+}
+
+async function optimizePrompt() {
+  if (state.optimizing) return;
+  if (!state.taskId) return;
+  const ta = $("chat-input");
+  const original = (ta.value || "").trim();
+  if (!original) return;
+  const btn = $("chat-optimize");
+  state.optimizing = true;
+  btn.disabled = true;
+  const oldLabel = btn.textContent;
+  btn.textContent = "润色中…";
+  const oldHint = $("chat-hint").textContent;
+  $("chat-hint").textContent = "润色中…";
+  try {
+    const r = await api("POST", `/v1/tasks/${state.taskId}/optimize_prompt`, {
+      text: ta.value,  // 不 trim — 后端再 strip;保留尾部 newline 让用户感受不变
+      image_model: state.imageModel || "",
+      video_model: state.videoModel || "",
+    });
+    const optimized = (r.optimized || "").trim();
+    if (!optimized) throw new Error("空结果");
+    // execCommand('insertText') 把"全选 + 替换"作为一个 undo 单元接入 textarea 原生栈
+    ta.focus();
+    ta.select();
+    const ok = document.execCommand("insertText", false, optimized);
+    if (!ok) {
+      // execCommand 在某些环境(contentEditable=false 旧 Firefox)失败 — 兜底直接赋值
+      // 这种情况下 Ctrl+Z 失效,但功能不阻塞;贴提示让用户知道
+      ta.value = optimized;
+      $("chat-hint").textContent = "已润色(本浏览器不支持撤销,需自行保留草稿)";
+    } else {
+      const cost = typeof r.cost_cny === "number" ? r.cost_cny.toFixed(4) : "?";
+      $("chat-hint").textContent = `已润色 · ${r.tokens_in || 0}+${r.tokens_out || 0} tok · ¥${cost} · Ctrl+Z 撤销`;
+    }
+  } catch (e) {
+    if (e.status === 401) { logout(); return; }
+    $("chat-hint").textContent = `润色失败:${e.message}`;
+  } finally {
+    state.optimizing = false;
+    btn.textContent = oldLabel;
+    syncOptimizeBtn();
+  }
+}
+
+$("chat-optimize").onclick = optimizePrompt;
+
+// 对话流里 artifact chip / 内联 img 点击委托 — 复用右栏文件预览 modal(modal 内自带"下载")。
+// 视频走原生 <video controls>:点击=播放/暂停,全屏走浏览器自带按钮,不进 modal —
+// 弹个 modal 反而打断播放,不如交给浏览器。
+$("chat-stream").addEventListener("click", (e) => {
+  const chip = e.target.closest && e.target.closest(".art-chip");
+  if (chip) {
+    const rel = chip.dataset.rel;
+    if (rel) openFilePreview(rel);
+    return;
+  }
+  const inlineImg = e.target.closest && e.target.closest(".art-media-image[data-rel]");
+  if (inlineImg) {
+    const rel = inlineImg.dataset.rel;
+    if (rel) openFilePreview(rel);
+  }
+});
+
+async function sendMessage() {
+  if (!state.taskId) return;
+  if (isCurrentTaskStreaming()) return;
+  const content = $("chat-input").value.trim();
+  if (!content) return;
+  setActionMode("cancelling");  // 临时锁住,等 events_url 拿到再切 streaming
+  $("chat-hint").textContent = "发送中…";
+  const taskId = state.taskId;
+  try {
+    // 立刻渲染 user 消息卡(乐观)
+    const wrap = $("chat-stream");
+    const userCard = document.createElement("div");
+    userCard.className = "msg user";
+    userCard.innerHTML = `<div class="role">我</div><div class="body">${escapeHtml(content)}</div>`;
+    wrap.appendChild(userCard);
+
+    // assistant 流式占位卡
+    const asstCard = document.createElement("div");
+    asstCard.className = "msg assistant live-run";
+    asstCard.innerHTML = `<div class="role">助手</div><div class="body streaming"></div>`;
+    wrap.appendChild(asstCard);
+    wrap.scrollTop = wrap.scrollHeight;
+
+    const r = await api("POST", `/v1/tasks/${taskId}/messages`, {
+      content,
+      image_model: state.imageModel || "",
+      video_model: state.videoModel || "",
+    });
+    $("chat-input").value = "";
+    syncOptimizeBtn();
+    const run = {
+      taskId,
+      url: r.events_url,
+      acc: "",
+      pending: false,
+      seenRels: new Set(),
+      terminal: false,
+      card: asstCard,
+      body: asstCard.querySelector(".body"),
+      cancelling: false,
+      workingDir: state.taskMeta && state.taskMeta.working_dir,
+    };
+    state.liveRuns.set(taskId, run);
+    state.streaming = true;
+    setActionMode("streaming");
+    streamSse(r.events_url, run);
+  } catch (e) {
+    if (e.status === 401) { logout(); return; }
+    appendErrorCard(e.message);
+    setActionMode("idle");
+    $("chat-hint").textContent = "就绪";
+  }
+}
+
+async function cancelCurrentTask() {
+  const run = getLiveRun(state.taskId);
+  if (!state.taskId || !run) return;
+  run.cancelling = true;
+  setActionMode("cancelling");
+  $("chat-hint").textContent = "停止中…";
+  try {
+    await api("POST", `/v1/tasks/${state.taskId}/cancel`);
+    // 不重置 streaming / 按钮 — 等 SSE 的 cancelled / done 走完一并清
+  } catch (e) {
+    if (e.status === 401) { logout(); return; }
+    // 409 = 已结束 / 已 cancelling,不算错;其他贴 toast
+    if (e.status !== 409) appendErrorCard("cancel: " + e.message);
+    run.cancelling = false;
+    setActionMode("streaming");
+    $("chat-hint").textContent = "接收中…";
+  }
+}
+
+function streamSse(url, run) {
+  // EventSource 不支持自定义 header,token 走 query string(?token=...)
+  // 这里 SSE 走 same-origin,token 经 URL 传给后端 — 但当前后端只读 Authorization 头
+  // 简单做法:走带 token 的 fetch + ReadableStream 替代 EventSource
+  fetchSse(url, run).catch((e) => {
+    appendRunError(run, "sse: " + e.message);
+  });
+}
+
+function appendRunError(run, msg) {
+  if (state.taskId === run.taskId) {
+    appendErrorCard(msg);
+    return;
+  }
+  const host = run.card || createLiveAssistantCard(run);
+  const card = document.createElement("div");
+  card.className = "msg error";
+  card.innerHTML = `<div class="role">错误</div><div class="body">${escapeHtml(msg)}</div>`;
+  host.appendChild(card);
+}
+
+async function fetchSse(url, run) {
+  const body = run.body || (run.card && run.card.querySelector(".body"));
+  run.body = body;
+  const ctx = run;
+  const hint = $("chat-hint");
+  // 重连:reader 异常 / 自然 EOF 但未收到 done/error 时,GET events 重订阅。
+  // 后端 stream_events 重连入口会校验 run_status,task 已不活跃直接吐 done 关流;
+  // 这里 3 次失败再放弃,覆盖 systemctl restart 的 1~2s 抖动 + reaper 跑完的窗口。
+  const backoffs = [1000, 2000, 4000];
+  let attempt = 0;
+  try {
+    while (true) {
+      try {
+        await consumeSseStream(url, run.card, ctx);
+      } catch (e) {
+        if (ctx.terminal) break;  // 已收到 done/error,不重连
+        if (attempt >= backoffs.length) {
+          appendRunError(ctx, "连接已断开,刚才的回复可能未完成,请重发消息。");
+          break;
+        }
+        setRunHint(ctx, `连接断开,重连中…(${attempt + 1}/${backoffs.length})`);
+        await new Promise(r => setTimeout(r, backoffs[attempt]));
+        attempt++;
+        continue;
+      }
+      // consumeSseStream 正常返回:reader 收到 EOF
+      if (ctx.terminal) break;  // 正常收尾(看到 done/error)
+      // 未见 done/error 就 EOF → 服务端中途关流(进程被杀 / nginx 切),重连
+      if (attempt >= backoffs.length) {
+        appendRunError(ctx, "连接已断开,刚才的回复可能未完成,请重发消息。");
+        break;
+      }
+      setRunHint(ctx, `连接断开,重连中…(${attempt + 1}/${backoffs.length})`);
+      await new Promise(r => setTimeout(r, backoffs[attempt]));
+      attempt++;
+    }
+    // 最终定稿 + 代码高亮(流式中不 highlight,省 CPU)
+    if (ctx.body) {
+      ctx.body.innerHTML = renderMd(ctx.acc);
+      if (ctx.card) highlightIn(ctx.card);
+    }
+  } finally {
+    if (ctx.body) ctx.body.classList.remove("streaming");
+    state.liveRuns.delete(ctx.taskId);
+    state.streaming = state.liveRuns.size > 0;
+    if (state.taskId === ctx.taskId) {
+      hint.textContent = ctx.lastUsageHint || "就绪";
+      setActionMode("idle");
+    }
+  }
+  // 刷新 task meta + messages(拿真实持久化的);失败路径已退出,这里不再跑
+  loadTaskList();
+  if (state.taskId === ctx.taskId) {
+    await loadMessages();
+    loadFiles();  // 回复结束后右侧文件面板同步刷新(可能有新写入 / 修改的产物)
+    refreshConcurrentWarnings();  // 自己 task 收尾,顺便清/更新 banner(同 wd 邻居可能也变了)
+  }
+}
+
+async function consumeSseStream(url, asstCard, ctx) {
+  const r = await fetch(url, {
+    headers: { "Authorization": "Bearer " + state.token, "Accept": "text/event-stream" },
+  });
+  if (!r.ok) throw new Error(r.status + " " + r.statusText);
+  const reader = r.body.getReader();
+  const dec = new TextDecoder();
+  let buf = "";
+  setRunHint(ctx, "接收中…");
+  while (true) {
+    const { value, done } = await reader.read();
+    if (done) return;
+    buf += dec.decode(value, { stream: true });
+    while (true) {
+      const idx = buf.indexOf("\n\n");
+      if (idx < 0) break;
+      const frame = buf.slice(0, idx);
+      buf = buf.slice(idx + 2);
+      const ev = parseSseFrame(frame);
+      if (!ev) continue;
+      handleSseEvent(ev, asstCard, ctx);
+      if (ev.event === "done" || ev.event === "error") {
+        ctx.terminal = true;
+        return;
+      }
+    }
+  }
+}
+
+function parseSseFrame(frame) {
+  const lines = frame.split("\n");
+  let event = "msg"; let dataLines = [];
+  for (const ln of lines) {
+    if (ln.startsWith(":")) continue;  // comment
+    if (ln.startsWith("event:")) event = ln.slice(6).trim();
+    else if (ln.startsWith("data:")) dataLines.push(ln.slice(5).replace(/^ /, ""));
+  }
+  if (!dataLines.length) return { event, data: null };
+  const raw = dataLines.join("\n");
+  let data = null;
+  try { data = JSON.parse(raw); } catch (e) { data = raw; }
+  return { event, data };
+}
+
+function handleSseEvent(ev, asstCard, ctx) {
+  const t = ev.event;
+  asstCard = asstCard || ctx.card || createLiveAssistantCard(ctx);
+  ctx.card = asstCard;
+  ctx.body = ctx.body || asstCard.querySelector(".body");
+  const stream = $("chat-stream");
+  const visible = state.taskId === ctx.taskId;
+  // 用户拖到上面看历史时不抢滚动,只在贴底时跟流
+  const nearBottom = visible && (stream.scrollHeight - stream.scrollTop - stream.clientHeight < 120);
+  if (t === "llm_start") {
+    ctx.contextStats = ev.data || {};
+    setRunHint(ctx, formatContextStats(ctx.contextStats));
+  } else if (t === "llm_end") {
+    ctx.lastUsageHint = formatUsageStats(ev.data || {}, ctx.contextStats);
+    setRunHint(ctx, ctx.lastUsageHint);
+  } else if (t === "text" && ev.data && ev.data.delta) {
+    ctx.acc += ev.data.delta;
+    // rAF 节流:每帧最多 1 次重渲染,流式 token 高频时不抖
+    if (!ctx.pending) {
+      ctx.pending = true;
+      requestAnimationFrame(() => {
+        ctx.body.innerHTML = renderMd(ctx.acc);
+        ctx.pending = false;
+        if (nearBottom) stream.scrollTop = stream.scrollHeight;
+      });
+    }
+  } else if (t === "tool_call") {
+    const fn = (ev.data && ev.data.name) || "?";
+    const args = (ev.data && ev.data.args) || "";
+    const argsStr = typeof args === "string" ? args : JSON.stringify(args, null, 2);
+    const label = toolActivityLabel(fn, args);
+    const det = document.createElement("details");
+    det.className = "tool-call";
+    det.innerHTML = `<summary>${escapeHtml(label)}</summary><pre>${escapeHtml(argsStr)}</pre>`;
+    asstCard.appendChild(det);
+    const wd = _workingDirName(ctx.workingDir);
+    const isProducer = ARTIFACT_PRODUCING_TOOLS.has(fn);
+    const fresh = isProducer
+      ? extractArtifactRels(argsStr, wd).filter(r => !ctx.seenRels.has(r))
+      : [];
+    fresh.forEach(r => ctx.seenRels.add(r));
+    const barHtml = renderArtifactBarHtml(fresh, isProducer);
+    if (barHtml) {
+      asstCard.insertAdjacentHTML("beforeend", barHtml);
+      if (isProducer) upgradeMediaArtifacts(asstCard);
+    }
+  } else if (t === "tool_result") {
+    const txt = (ev.data && ev.data.result) || "";
+    const txtStr = typeof txt === "string" ? txt : JSON.stringify(txt, null, 2);
+    const toolName = (ev.data && ev.data.name) || "";
+    const banner = extractMediaBanner(toolName, txtStr);
+    const det = document.createElement("details");
+    det.className = "tool-call";
+    det.innerHTML = `<summary>工具结果${banner}</summary><pre>${escapeHtml(txtStr)}</pre>`;
+    asstCard.appendChild(det);
+    const wd = _workingDirName(ctx.workingDir);
+    const isProducer = ARTIFACT_PRODUCING_TOOLS.has(toolName);
+    const fresh = isProducer
+      ? extractArtifactRels(txtStr, wd).filter(r => !ctx.seenRels.has(r))
+      : [];
+    fresh.forEach(r => ctx.seenRels.add(r));
+    const barHtml = renderArtifactBarHtml(fresh, isProducer);
+    if (barHtml) {
+      asstCard.insertAdjacentHTML("beforeend", barHtml);
+      if (isProducer) upgradeMediaArtifacts(asstCard);
+    }
+    if (visible) scheduleFilesRefresh();  // 工具调用结果回来,FS 可能被改了,debounce 刷新右侧
+  } else if (t === "cancelled") {
+    const badge = document.createElement("div");
+    badge.className = "cancelled-badge";
+    badge.textContent = "已停止";
+    asstCard.appendChild(badge);
+  } else if (t === "error") {
+    const msg = (ev.data && (ev.data.msg || ev.data.error)) || JSON.stringify(ev.data);
+    appendRunError(ctx, msg);
+  }
+  if (nearBottom) stream.scrollTop = stream.scrollHeight;
+}
+
+function appendErrorCard(msg) {
+  const card = document.createElement("div");
+  card.className = "msg error";
+  card.innerHTML = `<div class="role">错误</div><div class="body">${escapeHtml(msg)}</div>`;
+  $("chat-stream").appendChild(card);
+  $("chat-stream").scrollTop = $("chat-stream").scrollHeight;
+}
+
+// ───── done / abandon / delete / export ─────
+$("btn-done").onclick = () => state.taskId && setTaskStatus(state.taskId, "completed", (state.taskMeta && state.taskMeta.name) || "");
+$("btn-abandon").onclick = () => state.taskId && setTaskStatus(state.taskId, "abandoned", (state.taskMeta && state.taskMeta.name) || "");
+$("btn-delete-task").onclick = () => {
+  if (!state.taskId) return;
+  const t = state.taskMeta || {};
+  deleteTask(state.taskId, t.name || "(未命名)", t.n_messages || 0);
+};
+$("btn-export").onclick = () => state.taskId && exportTask(state.taskId);
+$("btn-clear-msgs").onclick = () => {
+  if (!state.taskId) return;
+  const t = state.taskMeta || {};
+  clearMessages(state.taskId, t.name || "(未命名)", t.n_messages || 0);
+};
+
+async function clearMessages(tid, name, nMsg) {
+  if (!confirm(`确认清空「${name}」的对话(${nMsg} 条消息)?\n\n将删除全部对话历史并重置 token 计数;工作目录下的文件保留。`)) return;
+  try {
+    const updated = await api("POST", "/v1/tasks/" + tid + "/clear");
+    if (state.taskId === tid) {
+      state.taskMeta = updated;
+      renderChatMeta();
+      renderMessages([]);
+      $("chat-hint").textContent = "对话已清空";
+    }
+    loadTaskList();
+  } catch (e) {
+    if (e.status === 401) { logout(); return; }
+    alert("清空失败:" + e.message);
+  }
+}
+
+async function setTaskStatus(tid, status, name) {
+  const labels = { completed: "已完成", abandoned: "已废弃" };
+  if (!confirm(`确认将「${name || tid.slice(0,8)}」置为「${labels[status] || status}」?`)) return;
+  try {
+    await api("PATCH", "/v1/tasks/" + tid, { status });
+    if (state.taskId === tid) await selectTask(tid);
+    loadTaskList();
+  } catch (e) {
+    if (e.status === 401) { logout(); return; }
+    alert("操作失败:" + e.message);
+  }
+}
+
+async function deleteTask(tid, name, nMsg) {
+  if (!confirm(`确认硬删除任务「${name}」(${nMsg} 条消息)?\n\n将清掉对话历史和 DB 行,但工作目录下的文件保留。`)) return;
+  try {
+    await api("DELETE", "/v1/tasks/" + tid);
+    if (state.taskId === tid) {
+      if (state.evtSrc) { state.evtSrc.close(); state.evtSrc = null; }
+      state.taskId = null;
+      state.taskMeta = null;
+      state.concurrentWarnings = [];
+      renderConcurrentWarning();
+      $("chat-meta").innerHTML = `<span class="muted">(未选中任务)</span>`;
+      $("chat-stream").innerHTML = `<div class="empty">请在左侧选一个任务</div>`;
+      $("chat-form").style.display = "none";
+      $("btn-done").disabled = true;
+      $("btn-abandon").disabled = true;
+      $("btn-delete-task").disabled = true;
+      $("btn-export").disabled = true;
+      $("btn-clear-msgs").disabled = true;
+    }
+    loadTaskList();
+    loadFiles();
+  } catch (e) {
+    if (e.status === 401) { logout(); return; }
+    alert("删除失败:" + e.message);
+  }
+}
+
+function exportTask(tid) {
+  fetch("/v1/tasks/" + tid + "/export", {
+    headers: { "Authorization": "Bearer " + state.token },
+  }).then(async (r) => {
+    if (!r.ok) { alert("导出失败:" + r.status); return; }
+    const blob = await r.blob();
+    const a = document.createElement("a");
+    a.href = URL.createObjectURL(blob);
+    a.download = "chat_" + tid.slice(0, 8) + ".docx";
+    document.body.appendChild(a); a.click();
+    setTimeout(() => { URL.revokeObjectURL(a.href); a.remove(); }, 1000);
+  });
+}
diff --git a/web/static/js/embed.js b/web/static/js/embed.js
index 85358a9..46433f6 100644
--- a/web/static/js/embed.js
+++ b/web/static/js/embed.js
@@ -3,7 +3,8 @@
 // embedPostToParent / embedShowWaiting(auth 的 logout 在 embed 下通知父页面/显示等待态)。
 import { state, LS_TOKEN, LS_UID, LS_NAME, EMBED_PARENT_ORIGIN, EMBED_INITIAL_TASK_ID } from "./state.js";
 import { $ } from "./dom.js";
-import { enterApp, loadTaskList, selectTask } from "./main.js";
+import { enterApp } from "./main.js";
+import { loadTaskList, selectTask } from "./chat.js";
 
 // embed 首个 task 自动定位的一次性标志(仅 embed 段使用)
 let _embedInitialTaskHandled = false;
diff --git a/web/static/js/files.js b/web/static/js/files.js
index 5b4f5c0..cf3cd0f 100644
--- a/web/static/js/files.js
+++ b/web/static/js/files.js
@@ -11,7 +11,7 @@ import { escapeHtml, humanSize } from "./format.js";
 import { openFilePreview } from "./preview.js";
 import { logout } from "./auth.js";
 import { downloadFile } from "./media.js";
-import { selectTask, loadTaskList } from "./main.js";
+import { selectTask, loadTaskList } from "./chat.js";
 import { loadFolderSuggestions } from "./newtask.js";
 
 // ───── files(user-rooted,不绑 task) ─────
@@ -349,7 +349,7 @@ function uploadFilesLabel(files) {
   if (!files || !files.length) return "";
   return files.length === 1 ? files[0].name : `${files[0].name} 等 ${files.length} 个文件`;
 }
-function formatUploadProgress(files, loaded, total) {
+export function formatUploadProgress(files, loaded, total) {
   const denom = total || uploadTotalBytes(files);
   const pct = denom ? Math.min(100, Math.max(0, Math.round((loaded / denom) * 100))) : 0;
   const sizeText = denom ? ` · ${humanSize(Math.min(loaded, denom))}/${humanSize(denom)}` : "";
diff --git a/web/static/js/main.js b/web/static/js/main.js
index 5c37c65..0fe67e2 100644
--- a/web/static/js/main.js
+++ b/web/static/js/main.js
@@ -1,25 +1,16 @@
-// zcbot dev 控制台主逻辑(login / 任务 / 流式 / 文件 / 预览 / embed / boot)。
-// 路径 1 模块化:叶子(state/format/dom/api/markdown)+ layout 已抽成独立模块;
-// 本文件是剩余主体,后续步骤会继续从这里把各功能段逐个剥成独立模块。
-import {
-  state,
-  LS_TOKEN, LS_UID, LS_NAME,
-  EMBED, EMBED_PARENT_ORIGIN, EMBED_INITIAL_TASK_ID,
-} from "./state.js";
-import {
-  escapeHtml, humanSize, fmtTime, fmtTokens,
-  taskUsageTooltip, formatTaskUsage, formatContextStats, formatUsageStats, fmtTimeAgo,
-} from "./format.js";
-import { $, showMenu } from "./dom.js";
+// zcbot dev 控制台入口 + 编排:enterApp(应用初始化)、loadStorage(存储用量)、
+// Esc 关弹窗栈、boot。功能逻辑全在各模块(chat/files/preview/media/auth/newtask/embed/layout/…),
+// 经各模块顶层 import 拉入依赖图(layout/markdown/media 由 chat 等引入,副作用照常)。
+import { state, EMBED } from "./state.js";
+import { humanSize, fmtTime } from "./format.js";
+import { $ } from "./dom.js";
 import { api } from "./api.js";
-import { renderMd, highlightIn } from "./markdown.js";
-import { mqPhone, setMobileView } from "./layout.js";
-import { logout, closeChpwModal } from "./auth.js";
-import { openFilePreview, openPasteFilePreview, closeFilePreview, closeMiniPreview, closePreviewIfShowing, _categorize } from "./preview.js";
-import { loadFiles, scheduleFilesRefresh, closeSrcPicker, uploadFiles } from "./files.js";
-import { toolActivityLabel, _workingDirName, extractMediaBanner, extractArtifactRels, renderArtifactBarHtml, upgradeMediaArtifacts, ARTIFACT_PRODUCING_TOOLS, _flushMediaArtifactCache } from "./media.js";
+import { closeChpwModal } from "./auth.js";
+import { closeFilePreview, closeMiniPreview } from "./preview.js";
+import { closeSrcPicker, loadFiles } from "./files.js";
 import { loadFolderSuggestions } from "./newtask.js";
 import { embedInit } from "./embed.js";
+import { loadTaskList, loadModels } from "./chat.js";
 
 // ───── enter app ─────
 export function enterApp() {
@@ -61,1075 +52,6 @@ async function loadStorage() {
   el.classList.add("show");
 }
 
-export async function loadModels() {
-  try {
-    const data = await api("GET", "/v1/models");
-    state.models = data.models || [];
-  } catch (e) {
-    state.models = [];  // 静默兜底:无模型清单时下拉不显示,不挡正常流程
-  }
-  try {
-    const data = await api("GET", "/v1/image_models");
-    state.imageModels = data.models || [];
-    // 默认锁定第一个(=agent_builder fallback);用户后续切换就会更新
-    if (!state.imageModel) {
-      const def = state.imageModels.find(m => m.is_default) || state.imageModels[0];
-      state.imageModel = def ? def.variant : "";
-    }
-  } catch (e) {
-    state.imageModels = [];
-    state.imageModel = "";
-  }
-  try {
-    const data = await api("GET", "/v1/video_models");
-    state.videoModels = data.models || [];
-    if (!state.videoModel) {
-      const def = state.videoModels.find(m => m.is_default) || state.videoModels[0];
-      state.videoModel = def ? def.variant : "";
-    }
-  } catch (e) {
-    state.videoModels = [];
-    state.videoModel = "";
-  }
-  // embed + task_id 场景下 selectTask 可能在 loadModels 完成前就跑完 renderChatMeta,
-  // 此时 models 为空 → 模型下拉不渲染。loadModels 收尾时如果已选中 task,补一次 chat-meta 重渲。
-  if (state.taskMeta) renderChatMeta();
-}
-
-// loadTaskList:默认 reset(filters/refresh/写操作后),append=true 由 sentinel observer 触发
-// 并发模型:append 受 taskLoading 互斥(避免观察器重复触发);reset 永远抢占,用 seq 丢弃过期响应
-let _taskLoadSeq = 0;
-export async function loadTaskList({ append = false } = {}) {
-  if (append && (state.taskLoading || !state.taskHasMore)) return;
-  const mySeq = ++_taskLoadSeq;
-  const nextPage = append ? state.taskPage + 1 : 1;
-  const params = new URLSearchParams();
-  params.set("page", nextPage);
-  params.set("page_size", state.taskPageSize);
-  const st = $("filter-status").value;
-  if (st) params.set("status", st);
-  const q = $("filter-q").value.trim();
-  if (q) params.set("q", q);
-  const wd = $("filter-wd").value.trim();
-  if (wd) params.set("working_dir", wd);
-  const ord = $("filter-order").value;
-  if (ord && ord !== "-created_at") params.set("ordering", ord);  // 默认值不发送,URL 更干净
-  state.taskLoading = true;
-  setSentinel(append ? "加载中…" : "");
-  try {
-    const data = await api("GET", "/v1/tasks?" + params.toString());
-    if (mySeq !== _taskLoadSeq) return;  // 已被更新的请求 supersede,丢弃
-    state.taskTotal = data.count || 0;
-    state.taskPage = data.page || nextPage;
-    state.taskPageSize = data.page_size || state.taskPageSize;
-    const results = data.results || [];
-    if (!append) state.taskLoaded = 0;
-    state.taskLoaded += results.length;
-    state.taskHasMore = state.taskLoaded < state.taskTotal;
-    renderTaskList(results, append);
-    renderTaskCount();
-  } catch (e) {
-    if (mySeq !== _taskLoadSeq) return;
-    if (e.status === 401) { logout(); return; }
-    if (!append) {
-      $("task-list").innerHTML = `<div class="empty">加载失败:${escapeHtml(e.message)}</div>`;
-      state.taskHasMore = false;
-    }
-    setSentinel(`加载失败:${e.message}`);
-  } finally {
-    if (mySeq === _taskLoadSeq) state.taskLoading = false;
-  }
-}
-
-function renderTaskCount() {
-  $("task-count").textContent = state.taskTotal > 0 ? `共 ${state.taskTotal} 个` : "";
-  if (state.taskTotal === 0) setSentinel("");
-  else if (!state.taskHasMore) setSentinel(state.taskPage > 1 ? "— 已加载全部 —" : "");
-  else setSentinel("");  // 还有更多 → 留空,observer 触发时再填"加载中"
-}
-
-function setSentinel(text) {
-  $("task-sentinel").textContent = text || "";
-}
-
-function renderTaskList(tasks, append = false) {
-  if (!append) state.tasksById = {};
-  for (const t of tasks) state.tasksById[t.task_id] = t;
-  if (!append && !tasks.length) {
-    $("task-list").innerHTML = `<div class="empty">(暂无任务)</div>`;
-    return;
-  }
-  if (append && !tasks.length) return;  // 末页空 batch,不动 DOM
-  const statusLabels = { active: "进行中", completed: "已完成", abandoned: "已废弃" };
-  const html = tasks.map((t) => {
-    const active = state.taskId === t.task_id ? " active" : "";
-    // 主行 = 任务名(必填字段);副行 = 工作目录 + description(都按需显示)
-    const taskName = t.name || "(未命名)";
-    const wdName = t.working_dir ? t.working_dir.split("/").filter(Boolean).pop() : "";
-    const desc = t.description || "";
-    const statusLabel = statusLabels[t.status] || t.status;
-    const rowTitle = `${taskName}\n${t.task_id}`;  // hover 出全名 + 完整 id(替代 meta 里被去掉的 id8)
-    return `
-      <div class="task-row${active}" data-tid="${t.task_id}" title="${escapeHtml(rowTitle)}" style="display:flex;align-items:flex-start;gap:6px;">
-        <div style="flex:1;min-width:0;">
-          <div class="desc">${escapeHtml(taskName)}</div>
-          ${wdName ? `<div class="meta muted" title="${escapeHtml(t.working_dir || "")}" style="display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;">📁 ${escapeHtml(wdName)}</div>` : ""}
-          ${desc ? `<div class="meta muted" title="${escapeHtml(desc)}" style="display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;">${escapeHtml(desc)}</div>` : ""}
-          <div class="meta">
-            <span class="badge ${t.status}">${statusLabel}</span>
-            ${t.skill ? `<span class="muted" title="${escapeHtml(t.skill)}">${escapeHtml(t.skill)}</span>` : ""}
-            <span class="num right-group">${t.n_messages || 0} 条</span>
-            <span class="num" title="${escapeHtml(taskUsageTooltip(t))}">${fmtTokens(t.tokens)} tok</span>
-            <span class="muted time-ago" title="${escapeHtml(fmtTime(t.updated_at))}">${escapeHtml(fmtTimeAgo(t.updated_at))}</span>
-          </div>
-        </div>
-        <button class="dd-toggle task-menu" data-tid="${t.task_id}" title="任务操作">⋯</button>
-      </div>
-    `;
-  }).join("");
-  const listEl = $("task-list");
-  let newRows;
-  if (append) {
-    const tmp = document.createElement("div");
-    tmp.innerHTML = html;
-    newRows = Array.from(tmp.children);
-    newRows.forEach((el) => listEl.appendChild(el));
-  } else {
-    listEl.innerHTML = html;
-    newRows = Array.from(listEl.querySelectorAll(".task-row"));
-  }
-  newRows.forEach((el) => {
-    if (!el.classList || !el.classList.contains("task-row")) return;
-    el.onclick = (e) => {
-      if (e.target.closest(".dd-toggle")) return;  // 菜单按钮点击不触发选中
-      selectTask(el.dataset.tid);
-    };
-    const btn = el.querySelector(".task-menu");
-    if (btn) {
-      btn.onclick = (e) => {
-        e.stopPropagation();
-        const t = state.tasksById[btn.dataset.tid];
-        if (!t) return;
-        showMenu(btn, taskMenuItems(t));
-      };
-    }
-  });
-}
-
-function taskMenuItems(t) {
-  const isActive = t.status === "active";
-  const hasMsg = (t.n_messages || 0) > 0;
-  return [
-    { act: "complete", label: "完成",       cls: "act-complete", disabled: !isActive,
-      onclick: () => setTaskStatus(t.task_id, "completed", t.name || "(未命名)") },
-    { act: "abandon",  label: "废弃",       cls: "act-abandon",  disabled: !isActive,
-      onclick: () => setTaskStatus(t.task_id, "abandoned", t.name || "(未命名)") },
-    { act: "export",   label: "导出对话记录",  cls: "act-export",   disabled: !hasMsg,
-      onclick: () => exportTask(t.task_id) },
-    { act: "delete",   label: "删除",       cls: "act-delete",
-      onclick: () => deleteTask(t.task_id, t.name || "(未命名)", t.n_messages || 0) },
-  ];
-}
-
-// 筛选 / 排序 / 刷新 一律 reset(loadTaskList 默认 append=false);追加由 sentinel observer 触发
-$("filter-status").onchange = () => loadTaskList();
-$("filter-order").onchange = () => loadTaskList();
-$("filter-wd").onchange = () => loadTaskList();   // select 选完立即筛
-$("btn-refresh-tasks").onclick = () => loadTaskList();
-
-// 搜索 q 是 text input → 300ms debounce 避免每字符打 API
-let _filterDebounce = null;
-$("filter-q").addEventListener("input", () => {
-  clearTimeout(_filterDebounce);
-  _filterDebounce = setTimeout(() => loadTaskList(), 300);
-});
-
-// 滚动加载:只让 task 列表区域滚,顶部标题 / 新建 / 筛选 / 排序固定。
-// rootMargin 提前 200px 触发,体感更顺;阈值 0 即可(刚进入即触发,append 期间 taskLoading 自带防抖)
-const _taskScrollObserver = new IntersectionObserver((entries) => {
-  if (entries[0].isIntersecting && state.taskHasMore && !state.taskLoading) {
-    loadTaskList({ append: true });
-  }
-}, { root: $("task-scroll"), rootMargin: "200px 0px" });
-_taskScrollObserver.observe($("task-sentinel"));
-
-// ───── select task ─────
-export async function selectTask(tid) {
-  if (state.evtSrc) { state.evtSrc.close(); state.evtSrc = null; }
-  // 切 task 清掉上个 task 累积的 inline media blob URL — 新 task 的 rel 不同,
-  // 旧 URL 留着只占内存。同 task 切回(tid === state.taskId)不算切换,跳过。
-  if (state.taskId && state.taskId !== tid) _flushMediaArtifactCache();
-  state.taskId = tid;
-  document.querySelectorAll(".task-row").forEach((el) => {
-    el.classList.toggle("active", el.dataset.tid === tid);
-  });
-  // 手机视图:选中任务自动切到对话面板(桌面 mqPhone 不命中 → no-op)
-  if (mqPhone.matches) setMobileView("mv-mid");
-  try {
-    const meta = await api("GET", "/v1/tasks/" + tid);
-    state.taskMeta = meta;
-    renderChatMeta();
-    await loadMessages();
-    if (meta.run_status === "running" || meta.run_status === "cancelling") {
-      ensureRunningTaskSubscribed(tid, `/v1/tasks/${tid}/events`);
-    } else {
-      renderLiveRunIfVisible();
-    }
-    // 文件面板自动跳到该 task 的 working_dir(user_root 下一级子目录),
-    // 不强绑定 — 用户可点 crumb 回上层看 user_root 其他目录
-    const wdName = meta.working_dir ? meta.working_dir.split("/").filter(Boolean).pop() : "";
-    state.filesPath = wdName || "";
-    await loadFiles();
-    refreshConcurrentWarnings();  // 同 wd 其他 task 活跃软警告 — 后台 fire-and-forget
-  } catch (e) {
-    if (e.status === 401) { logout(); return; }
-    $("chat-stream").innerHTML = `<div class="empty">加载失败:${escapeHtml(e.message)}</div>`;
-  }
-}
-
-// 拉同 wd 内除自己外仍 running/cancelling 的 task,渲染软警告 banner。
-// 同 wd 多 task 同时跑频率近 0(用户工作流以"同项目对话历史轨迹"为主,不并发),
-// 这里只做提示,不挡发送(对应 DESIGN §7.8 / §7.9 "信任 + 软警告 + 承认边界")。
-async function refreshConcurrentWarnings() {
-  const t = state.taskMeta;
-  if (!t || !t.working_dir) { state.concurrentWarnings = []; renderConcurrentWarning(); return; }
-  const wdName = t.working_dir.split("/").filter(Boolean).pop();
-  if (!wdName) { state.concurrentWarnings = []; renderConcurrentWarning(); return; }
-  const params = new URLSearchParams();
-  params.set("working_dir", wdName);
-  params.set("run_status", "running,cancelling");
-  params.set("page_size", "10");
-  try {
-    const data = await api("GET", "/v1/tasks?" + params.toString());
-    const others = (data.results || []).filter(r => r.task_id !== t.task_id);
-    state.concurrentWarnings = others;
-  } catch (e) {
-    // 警告失败不影响主功能,静默
-    state.concurrentWarnings = [];
-  }
-  renderConcurrentWarning();
-}
-
-function renderConcurrentWarning() {
-  const el = $("wd-concurrent-warn");
-  const others = state.concurrentWarnings;
-  if (!others || others.length === 0) { el.style.display = "none"; el.innerHTML = ""; return; }
-  const head = others[0];
-  const t = state.taskMeta;
-  const wdName = t && t.working_dir ? t.working_dir.split("/").filter(Boolean).pop() : "";
-  const more = others.length > 1 ? ` 等 ${others.length} 个` : "";
-  el.innerHTML = `⚠ 项目 "${escapeHtml(wdName)}" 内 task <span class="tname">${escapeHtml(head.name || "(未命名)")}</span> 正在 <span class="rs">${escapeHtml(head.run_status)}</span>${more} — 并发写同名中间产物可能互覆,建议等它结束再发`;
-  el.style.display = "block";
-}
-
-function renderChatMeta() {
-  const t = state.taskMeta;
-  if (!t) { $("chat-meta").innerHTML = `<span class="muted">(未选中任务)</span>`; return; }
-  const wdName = t.working_dir ? t.working_dir.split("/").filter(Boolean).pop() : "";
-  const taskName = t.name || "(未命名)";
-  const statusLabel = { active: "进行中", completed: "已完成", abandoned: "已废弃" }[t.status] || t.status;
-  // wdName 与 taskName 相同时(留空 fallback,多数场景)不重复显示 📁;
-  // 不同时(用户显式指定共享目录 / 改了 name)才挂 📁,提示"项目归属"
-  const wdBadge = (wdName && wdName !== taskName)
-    ? `<span class="muted" title="${escapeHtml(t.working_dir)}">📁 ${escapeHtml(wdName)}</span>`
-    : "";
-  $("chat-meta").innerHTML = `
-    <span style="font-weight:600;" title="${escapeHtml(taskName)}">${escapeHtml(taskName)}</span>
-    <span class="badge ${t.status}">${statusLabel}</span>
-    ${wdBadge}
-    ${t.skill ? `<span class="muted">${escapeHtml(t.skill)}</span>` : ""}
-    <span class="tid">${t.task_id.slice(0, 8)}</span>
-    ${formatTaskUsage(t)}
-    ${t.description ? `<span class="muted desc">${escapeHtml(t.description)}</span>` : ""}
-    <span class="spacer"></span>
-    ${renderModelDropdown(t)}
-    ${renderImageModelDropdown()}
-    ${renderVideoModelDropdown()}
-  `;
-  const sel = $("chat-model-sel");
-  if (sel) sel.onchange = onChangeModel;
-  const imgSel = $("chat-image-model-sel");
-  if (imgSel) imgSel.onchange = onChangeImageModel;
-  const vidSel = $("chat-video-model-sel");
-  if (vidSel) vidSel.onchange = onChangeVideoModel;
-  const active = t.status === "active";
-  $("chat-form").style.display = active ? "flex" : "none";
-  syncOptimizeBtn();
-  $("btn-done").disabled = !active;
-  $("btn-abandon").disabled = !active;
-  $("btn-delete-task").disabled = false;  // delete 不限 status(用户显式 confirm)
-  // 导出 / 清空:只要选中 task 就允许点(不按 n_messages 门禁 —— 历史 bug:
-  // 清空后 n_messages=0 disable,但新对话进来后 taskMeta 不重渲一直 disable;
-  // 0 条时点击不会出错(导出空 docx / 清空 confirm 显 0 条),让 UX 一致更省心)。
-  $("btn-export").disabled = false;
-  // 清空对话:仅活跃 run 期间禁用(后端 409,confirm 通过后才报错 UX 差)
-  const running = t.run_status === "running" || t.run_status === "cancelling";
-  $("btn-clear-msgs").disabled = running;
-}
-
-function renderModelDropdown(t) {
-  // 模型清单未加载好(或为空)时不渲染下拉,但 task 仍可正常用(后端走 task.model_profile)
-  if (!state.models || state.models.length === 0) return "";
-  const cur = t.model_profile || "";
-  const opts = state.models.map(m =>
-    `<option value="${escapeHtml(m.profile)}" ${m.profile === cur ? "selected" : ""}>${escapeHtml(m.display_name)}</option>`
-  ).join("");
-  return `<span class="muted small mdl-wrap" style="display:inline-flex;align-items:center;gap:4px;"><span class="mdl-text">模型</span><span class="mdl-icon" aria-hidden="true">💬</span><select id="chat-model-sel" class="small" style="width:auto;padding:1px 4px;font-size:12px;" title="切换 task 模型(下条消息生效)">${opts}</select></span>`;
-}
-
-function renderImageModelDropdown() {
-  // imageModels 为空(yaml 无 image variant)→ 不画下拉。注意不依赖 ARK_API_KEY 是否设了
-  // —— 这里只是展示元数据,真正调用时 backend 那边没 key 自然 tool 不挂(用户不会
-  // 在没 key 的环境点出图,prompt 里 seedream 工具压根不在 schema)。
-  if (!state.imageModels || state.imageModels.length === 0) return "";
-  const cur = state.imageModel || "";
-  const opts = state.imageModels.map(m =>
-    `<option value="${escapeHtml(m.variant)}" ${m.variant === cur ? "selected" : ""}>${escapeHtml(m.display_name)}</option>`
-  ).join("");
-  return `<span class="muted small mdl-wrap" style="display:inline-flex;align-items:center;gap:4px;"><span class="mdl-text">生图</span><span class="mdl-icon" aria-hidden="true">🖼</span><select id="chat-image-model-sel" class="small" style="width:auto;padding:1px 4px;font-size:12px;" title="下一条消息触发生图时使用的模型(本地选择,不入库)">${opts}</select></span>`;
-}
-
-function onChangeImageModel(ev) {
-  // 纯前端 state,不 PATCH;选中值随下一次 POST /v1/tasks/{id}/messages 的 image_model 字段一起发
-  state.imageModel = ev.target.value || "";
-  $("chat-hint").textContent = `生图模型 → ${ev.target.options[ev.target.selectedIndex].text}`;
-}
-
-function renderVideoModelDropdown() {
-  // 同 renderImageModelDropdown:videoModels 为空 → 不画。yaml 无 video 段 / 后端
-  // /v1/video_models 返空时下拉不出现,seedance tool 也不会在 schema 里。
-  if (!state.videoModels || state.videoModels.length === 0) return "";
-  const cur = state.videoModel || "";
-  const opts = state.videoModels.map(m =>
-    `<option value="${escapeHtml(m.variant)}" ${m.variant === cur ? "selected" : ""}>${escapeHtml(m.display_name)}</option>`
-  ).join("");
-  return `<span class="muted small mdl-wrap" style="display:inline-flex;align-items:center;gap:4px;"><span class="mdl-text">生视频</span><span class="mdl-icon" aria-hidden="true">🎬</span><select id="chat-video-model-sel" class="small" style="width:auto;padding:1px 4px;font-size:12px;" title="下一条消息触发生视频时使用的模型(本地选择,不入库)">${opts}</select></span>`;
-}
-
-function onChangeVideoModel(ev) {
-  state.videoModel = ev.target.value || "";
-  $("chat-hint").textContent = `生视频模型 → ${ev.target.options[ev.target.selectedIndex].text}`;
-}
-
-async function onChangeModel(ev) {
-  const sel = ev.target;
-  const newProfile = sel.value;
-  const t = state.taskMeta;
-  if (!t || !newProfile || newProfile === t.model_profile) return;
-  const oldProfile = t.model_profile || "";
-  try {
-    const updated = await api("PATCH", `/v1/tasks/${t.task_id}`, { model_profile: newProfile });
-    state.taskMeta = updated;
-    const running = updated.run_status === "running" || updated.run_status === "cancelling";
-    $("chat-hint").textContent = running
-      ? `已切到 ${newProfile} · 当前 run 跑完后生效`
-      : `已切到 ${newProfile}`;
-  } catch (e) {
-    sel.value = oldProfile;  // PATCH 失败 UI 回滚
-    $("chat-hint").textContent = `切换失败:${e.message}`;
-  }
-}
-
-async function loadMessages() {
-  const data = await api("GET", `/v1/tasks/${state.taskId}/messages`);
-  renderMessages(data.messages);
-}
-
-function getLiveRun(taskId) {
-  return taskId ? state.liveRuns.get(taskId) : null;
-}
-
-function isCurrentTaskStreaming() {
-  return !!getLiveRun(state.taskId);
-}
-
-function createLiveAssistantCard(run) {
-  const card = document.createElement("div");
-  card.className = "msg assistant live-run";
-  card.innerHTML = `<div class="role">助手</div><div class="body streaming">${run.acc ? renderMd(run.acc) : ""}</div>`;
-  run.card = card;
-  run.body = card.querySelector(".body");
-  return card;
-}
-
-function renderLiveRunIfVisible() {
-  const run = getLiveRun(state.taskId);
-  if (!run) {
-    setActionMode("idle");
-    return;
-  }
-  const wrap = $("chat-stream");
-  const card = run.card || createLiveAssistantCard(run);
-  if (run.body && run.acc) run.body.innerHTML = renderMd(run.acc);
-  if (card.parentElement !== wrap) wrap.appendChild(card);
-  wrap.scrollTop = wrap.scrollHeight;
-  setActionMode(run.cancelling ? "cancelling" : "streaming");
-  $("chat-hint").textContent = run.cancelling ? "停止中…" : "接收中…";
-}
-
-function ensureRunningTaskSubscribed(taskId, url) {
-  if (!taskId || getLiveRun(taskId)) return;
-  const run = {
-    taskId,
-    url,
-    acc: "",
-    pending: false,
-    seenRels: new Set(),
-    terminal: false,
-    card: null,
-    body: null,
-    cancelling: state.taskMeta && state.taskMeta.run_status === "cancelling",
-    workingDir: state.taskMeta && state.taskMeta.working_dir,
-  };
-  state.liveRuns.set(taskId, run);
-  state.streaming = true;
-  renderLiveRunIfVisible();
-  streamSse(url, run);
-}
-
-function setRunHint(run, text) {
-  if (state.taskId === run.taskId) $("chat-hint").textContent = text;
-}
-
-function renderMessages(msgs) {
-  const wrap = $("chat-stream");
-  wrap.innerHTML = "";
-  if (!msgs.length) {
-    wrap.innerHTML = `<div class="empty">(暂无消息 · 在下方输入开始对话)</div>`;
-    renderLiveRunIfVisible();
-    return;
-  }
-  // 模型切换点小标:assistant 行的 model_profile 与上一个 assistant 不同就插一行分隔
-  // (含首条);避免每条都标制造噪声。空 model_profile(历史旧数据)不画。
-  let lastAsstModel = null;
-  // chip 去重:同一路径在 tool 结果里挂过 inline 图后,assistant 正文 echo 同路径不再重挂。
-  // chronological 遍历,首次出现保留(tool 结果常在前),后续重复过滤掉。
-  const seenRels = new Set();
-  const pickFresh = (rels) => {
-    const fresh = [];
-    for (const r of rels) {
-      if (seenRels.has(r)) continue;
-      seenRels.add(r);
-      fresh.push(r);
-    }
-    return fresh;
-  };
-  for (const m of msgs) {
-    const p = m.payload || {};
-    const role = p.role || "?";
-    if (role === "system") continue;  // 不显示 system
-    if (role === "assistant" && m.model_profile && m.model_profile !== lastAsstModel) {
-      const dn = (state.models.find(x => x.profile === m.model_profile) || {}).display_name || m.model_profile;
-      const sep = document.createElement("div");
-      sep.className = "model-switch muted";
-      sep.style.cssText = "margin:8px 0;text-align:center;font-size:11px;letter-spacing:0.5px;";
-      sep.textContent = `── ${dn} ──`;
-      wrap.appendChild(sep);
-      lastAsstModel = m.model_profile;
-    }
-    if (role === "tool") {
-      // 嵌进上一个 assistant 的 tool_call(简化:直接独立显示)
-      const card = document.createElement("div");
-      card.className = "msg tool";
-      const txt = typeof p.content === "string" ? p.content : JSON.stringify(p.content);
-      const wd = _workingDirName(state.taskMeta && state.taskMeta.working_dir);
-      const banner = extractMediaBanner(p.name || "", txt || "");
-      // 工具结果只有产物工具(seedream/seedance)挂 chip + inline 大图;通用工具
-      // (grep/read/glob/shell)echo 的路径是"引用"不是"产物",不挂以免噪声。
-      const isProducer = ARTIFACT_PRODUCING_TOOLS.has(p.name || "");
-      const rels = isProducer ? pickFresh(extractArtifactRels(txt || "", wd)) : [];
-      card.innerHTML = `
-        <div class="role">工具调用 · ${escapeHtml(p.name || "")}</div>
-        <details class="tool-call"><summary>结果(${(txt || "").length} 字符)${banner}</summary><pre>${escapeHtml(txt || "")}</pre></details>
-        ${renderArtifactBarHtml(rels, isProducer)}
-      `;
-      wrap.appendChild(card);
-      continue;
-    }
-    const card = document.createElement("div");
-    card.className = "msg " + role;
-    const roleLabel = { user: "我", assistant: "助手", error: "错误" }[role] || role;
-    let html = `<div class="role">${roleLabel}</div>`;
-    if (typeof p.content === "string" && p.content) {
-      html += `<div class="body">${renderMd(p.content)}</div>`;
-      // assistant 正文里 echo 的 <wd>/... 路径**永远**挂 chip(绕开 seenRels —— 上面
-      // tool 结果可能 inline 过同图,但 chip 是小按钮无视觉污染,助手回复里有可
-      // 点的"产物锚点"比没有好);强制 allowInlineMedia=false 防止大图被重复 inline。
-      if (role === "assistant") {
-        const wd = _workingDirName(state.taskMeta && state.taskMeta.working_dir);
-        html += renderArtifactBarHtml(extractArtifactRels(p.content, wd), false);
-      }
-    }
-    if (Array.isArray(p.tool_calls) && p.tool_calls.length) {
-      const wd = _workingDirName(state.taskMeta && state.taskMeta.working_dir);
-      for (const tc of p.tool_calls) {
-        const fn = (tc.function && tc.function.name) || "?";
-        let argsObj = {};
-        let args = "";
-        try {
-          argsObj = JSON.parse((tc.function && tc.function.arguments) || "{}");
-          args = JSON.stringify(argsObj, null, 2);
-        } catch (e) { args = (tc.function && tc.function.arguments) || ""; }
-        const label = toolActivityLabel(fn, argsObj);
-        const isProducer = ARTIFACT_PRODUCING_TOOLS.has(fn);
-        const rels = isProducer ? pickFresh(extractArtifactRels(args, wd)) : [];
-        html += `
-          <details class="tool-call"><summary>${escapeHtml(label)}</summary><pre>${escapeHtml(args)}</pre></details>
-          ${renderArtifactBarHtml(rels, isProducer)}
-        `;
-      }
-    }
-    card.innerHTML = html;
-    highlightIn(card);
-    wrap.appendChild(card);
-  }
-  wrap.scrollTop = wrap.scrollHeight;
-  upgradeMediaArtifacts(wrap);
-  renderLiveRunIfVisible();
-}
-
-// ───── send + SSE ─────
-// 发送 / 停止 单按钮:idle → 发送(primary 红实心);streaming → 停止(danger 红边);
-// cancelling 是过渡态 — 用户点过停止后到 SSE 收到 cancelled/done 之间。
-function setActionMode(mode) {
-  const btn = $("chat-action");
-  btn.classList.remove("primary", "danger");
-  if (mode === "idle") {
-    btn.textContent = "发送";
-    btn.classList.add("primary");
-    btn.disabled = false;
-    btn.title = "";
-  } else if (mode === "streaming") {
-    btn.textContent = "停止";
-    btn.classList.add("danger");
-    btn.disabled = false;
-    btn.title = "停止当前流式回复";
-  } else if (mode === "cancelling") {
-    btn.textContent = "停止中…";
-    btn.classList.add("danger");
-    btn.disabled = true;
-  }
-}
-
-function chatAction() {
-  if (isCurrentTaskStreaming()) cancelCurrentTask();
-  else sendMessage();
-}
-
-$("chat-form").addEventListener("submit", (e) => { e.preventDefault(); chatAction(); });
-$("chat-input").addEventListener("keydown", (e) => {
-  // streaming 期间 Enter 不触发停止 —— 用户可能正在编辑下一条草稿,误触发风险高
-  if (e.key === "Enter" && !e.shiftKey) {
-    e.preventDefault();
-    if (!isCurrentTaskStreaming()) sendMessage();
-  }
-});
-$("chat-input").addEventListener("input", syncOptimizeBtn);
-// 粘贴含文件 → 直接上传到当前目录(复用拖拽通路);纯文本走默认
-// 反馈走 chat-hint:上传中 → 已粘贴 + chip;下一次发送会自然覆盖为"发送中…"。
-$("chat-input").addEventListener("paste", async (e) => {
-  const files = Array.from(e.clipboardData?.files || []);
-  if (!files.length) return;
-  e.preventDefault();
-  const hint = $("chat-hint");
-  const prevHint = hint.textContent;
-  hint.textContent = files.length === 1 ? `上传中:${files[0].name}…` : `上传中:${files.length} 个文件…`;
-  const saved = await uploadFiles(files, {
-    onProgress: (loaded, total) => {
-      hint.textContent = formatUploadProgress(files, loaded, total);
-    },
-  });
-  if (saved && saved.length) {
-    hint.innerHTML = `已粘贴 ${renderPasteFileChips(saved)} <span class="muted">可在右侧文件处查看</span>`;
-  } else {
-    hint.textContent = prevHint;  // 失败 alert 已弹,hint 回原
-  }
-});
-
-function renderPasteFileChips(saved) {
-  return (saved || []).map((f) => {
-    const rel = f.rel || f.name || "";
-    const name = f.name || (rel.split("/").pop() || rel);
-    return `<span class="paste-chip-wrap" data-rel="${escapeHtml(rel)}"><button type="button" class="art-chip paste-chip" data-rel="${escapeHtml(rel)}" title="${escapeHtml(rel)} · 点击预览">${escapeHtml(name)}</button><button type="button" class="paste-chip-del" data-rel="${escapeHtml(rel)}" title="删除该粘贴文件">×</button></span>`;
-  }).join("");
-}
-
-$("chat-hint").addEventListener("click", (e) => {
-  const del = e.target.closest && e.target.closest(".paste-chip-del[data-rel]");
-  if (del) {
-    e.stopPropagation();
-    deletePastedFile(del.dataset.rel, del.closest(".paste-chip-wrap"));
-    return;
-  }
-  const chip = e.target.closest && e.target.closest(".paste-chip[data-rel]");
-  if (!chip) return;
-  const rel = chip.dataset.rel;
-  if (rel) openPasteFilePreview(rel);
-});
-
-async function deletePastedFile(rel, wrap) {
-  if (!rel || !wrap) return;
-  const btn = wrap.querySelector(".paste-chip-del");
-  if (btn) btn.disabled = true;
-  try {
-    await api("POST", "/v1/files/delete", { path: rel, recursive: false });
-    closePreviewIfShowing(rel);
-    wrap.remove();
-    await loadFiles();
-    const hint = $("chat-hint");
-    if (!hint.querySelector(".paste-chip-wrap")) {
-      hint.innerHTML = `<span class="muted">已删除粘贴文件</span>`;
-    }
-  } catch (e) {
-    if (btn) btn.disabled = false;
-    if (e.status === 401) { logout(); return; }
-    alert("删除失败:" + e.message);
-  }
-}
-
-// 润色:同步调后端,把 textarea 内容替成优化后文本。用 execCommand('insertText')
-// 接 textarea 原生 undo 栈 — Ctrl+Z 一次回到原文。streaming 期间允许并行(后端
-// 不与主对话 run 互斥,各跑各的 LLM)。
-function syncOptimizeBtn() {
-  const btn = $("chat-optimize");
-  if (!btn) return;
-  if (state.optimizing) return;  // 进行中不在这条路径切
-  const has = ($("chat-input").value || "").trim().length > 0;
-  btn.disabled = !has || !state.taskId;
-}
-
-async function optimizePrompt() {
-  if (state.optimizing) return;
-  if (!state.taskId) return;
-  const ta = $("chat-input");
-  const original = (ta.value || "").trim();
-  if (!original) return;
-  const btn = $("chat-optimize");
-  state.optimizing = true;
-  btn.disabled = true;
-  const oldLabel = btn.textContent;
-  btn.textContent = "润色中…";
-  const oldHint = $("chat-hint").textContent;
-  $("chat-hint").textContent = "润色中…";
-  try {
-    const r = await api("POST", `/v1/tasks/${state.taskId}/optimize_prompt`, {
-      text: ta.value,  // 不 trim — 后端再 strip;保留尾部 newline 让用户感受不变
-      image_model: state.imageModel || "",
-      video_model: state.videoModel || "",
-    });
-    const optimized = (r.optimized || "").trim();
-    if (!optimized) throw new Error("空结果");
-    // execCommand('insertText') 把"全选 + 替换"作为一个 undo 单元接入 textarea 原生栈
-    ta.focus();
-    ta.select();
-    const ok = document.execCommand("insertText", false, optimized);
-    if (!ok) {
-      // execCommand 在某些环境(contentEditable=false 旧 Firefox)失败 — 兜底直接赋值
-      // 这种情况下 Ctrl+Z 失效,但功能不阻塞;贴提示让用户知道
-      ta.value = optimized;
-      $("chat-hint").textContent = "已润色(本浏览器不支持撤销,需自行保留草稿)";
-    } else {
-      const cost = typeof r.cost_cny === "number" ? r.cost_cny.toFixed(4) : "?";
-      $("chat-hint").textContent = `已润色 · ${r.tokens_in || 0}+${r.tokens_out || 0} tok · ¥${cost} · Ctrl+Z 撤销`;
-    }
-  } catch (e) {
-    if (e.status === 401) { logout(); return; }
-    $("chat-hint").textContent = `润色失败:${e.message}`;
-  } finally {
-    state.optimizing = false;
-    btn.textContent = oldLabel;
-    syncOptimizeBtn();
-  }
-}
-
-$("chat-optimize").onclick = optimizePrompt;
-
-// 对话流里 artifact chip / 内联 img 点击委托 — 复用右栏文件预览 modal(modal 内自带"下载")。
-// 视频走原生 <video controls>:点击=播放/暂停,全屏走浏览器自带按钮,不进 modal —
-// 弹个 modal 反而打断播放,不如交给浏览器。
-$("chat-stream").addEventListener("click", (e) => {
-  const chip = e.target.closest && e.target.closest(".art-chip");
-  if (chip) {
-    const rel = chip.dataset.rel;
-    if (rel) openFilePreview(rel);
-    return;
-  }
-  const inlineImg = e.target.closest && e.target.closest(".art-media-image[data-rel]");
-  if (inlineImg) {
-    const rel = inlineImg.dataset.rel;
-    if (rel) openFilePreview(rel);
-  }
-});
-
-async function sendMessage() {
-  if (!state.taskId) return;
-  if (isCurrentTaskStreaming()) return;
-  const content = $("chat-input").value.trim();
-  if (!content) return;
-  setActionMode("cancelling");  // 临时锁住,等 events_url 拿到再切 streaming
-  $("chat-hint").textContent = "发送中…";
-  const taskId = state.taskId;
-  try {
-    // 立刻渲染 user 消息卡(乐观)
-    const wrap = $("chat-stream");
-    const userCard = document.createElement("div");
-    userCard.className = "msg user";
-    userCard.innerHTML = `<div class="role">我</div><div class="body">${escapeHtml(content)}</div>`;
-    wrap.appendChild(userCard);
-
-    // assistant 流式占位卡
-    const asstCard = document.createElement("div");
-    asstCard.className = "msg assistant live-run";
-    asstCard.innerHTML = `<div class="role">助手</div><div class="body streaming"></div>`;
-    wrap.appendChild(asstCard);
-    wrap.scrollTop = wrap.scrollHeight;
-
-    const r = await api("POST", `/v1/tasks/${taskId}/messages`, {
-      content,
-      image_model: state.imageModel || "",
-      video_model: state.videoModel || "",
-    });
-    $("chat-input").value = "";
-    syncOptimizeBtn();
-    const run = {
-      taskId,
-      url: r.events_url,
-      acc: "",
-      pending: false,
-      seenRels: new Set(),
-      terminal: false,
-      card: asstCard,
-      body: asstCard.querySelector(".body"),
-      cancelling: false,
-      workingDir: state.taskMeta && state.taskMeta.working_dir,
-    };
-    state.liveRuns.set(taskId, run);
-    state.streaming = true;
-    setActionMode("streaming");
-    streamSse(r.events_url, run);
-  } catch (e) {
-    if (e.status === 401) { logout(); return; }
-    appendErrorCard(e.message);
-    setActionMode("idle");
-    $("chat-hint").textContent = "就绪";
-  }
-}
-
-async function cancelCurrentTask() {
-  const run = getLiveRun(state.taskId);
-  if (!state.taskId || !run) return;
-  run.cancelling = true;
-  setActionMode("cancelling");
-  $("chat-hint").textContent = "停止中…";
-  try {
-    await api("POST", `/v1/tasks/${state.taskId}/cancel`);
-    // 不重置 streaming / 按钮 — 等 SSE 的 cancelled / done 走完一并清
-  } catch (e) {
-    if (e.status === 401) { logout(); return; }
-    // 409 = 已结束 / 已 cancelling,不算错;其他贴 toast
-    if (e.status !== 409) appendErrorCard("cancel: " + e.message);
-    run.cancelling = false;
-    setActionMode("streaming");
-    $("chat-hint").textContent = "接收中…";
-  }
-}
-
-function streamSse(url, run) {
-  // EventSource 不支持自定义 header,token 走 query string(?token=...)
-  // 这里 SSE 走 same-origin,token 经 URL 传给后端 — 但当前后端只读 Authorization 头
-  // 简单做法:走带 token 的 fetch + ReadableStream 替代 EventSource
-  fetchSse(url, run).catch((e) => {
-    appendRunError(run, "sse: " + e.message);
-  });
-}
-
-function appendRunError(run, msg) {
-  if (state.taskId === run.taskId) {
-    appendErrorCard(msg);
-    return;
-  }
-  const host = run.card || createLiveAssistantCard(run);
-  const card = document.createElement("div");
-  card.className = "msg error";
-  card.innerHTML = `<div class="role">错误</div><div class="body">${escapeHtml(msg)}</div>`;
-  host.appendChild(card);
-}
-
-async function fetchSse(url, run) {
-  const body = run.body || (run.card && run.card.querySelector(".body"));
-  run.body = body;
-  const ctx = run;
-  const hint = $("chat-hint");
-  // 重连:reader 异常 / 自然 EOF 但未收到 done/error 时,GET events 重订阅。
-  // 后端 stream_events 重连入口会校验 run_status,task 已不活跃直接吐 done 关流;
-  // 这里 3 次失败再放弃,覆盖 systemctl restart 的 1~2s 抖动 + reaper 跑完的窗口。
-  const backoffs = [1000, 2000, 4000];
-  let attempt = 0;
-  try {
-    while (true) {
-      try {
-        await consumeSseStream(url, run.card, ctx);
-      } catch (e) {
-        if (ctx.terminal) break;  // 已收到 done/error,不重连
-        if (attempt >= backoffs.length) {
-          appendRunError(ctx, "连接已断开,刚才的回复可能未完成,请重发消息。");
-          break;
-        }
-        setRunHint(ctx, `连接断开,重连中…(${attempt + 1}/${backoffs.length})`);
-        await new Promise(r => setTimeout(r, backoffs[attempt]));
-        attempt++;
-        continue;
-      }
-      // consumeSseStream 正常返回:reader 收到 EOF
-      if (ctx.terminal) break;  // 正常收尾(看到 done/error)
-      // 未见 done/error 就 EOF → 服务端中途关流(进程被杀 / nginx 切),重连
-      if (attempt >= backoffs.length) {
-        appendRunError(ctx, "连接已断开,刚才的回复可能未完成,请重发消息。");
-        break;
-      }
-      setRunHint(ctx, `连接断开,重连中…(${attempt + 1}/${backoffs.length})`);
-      await new Promise(r => setTimeout(r, backoffs[attempt]));
-      attempt++;
-    }
-    // 最终定稿 + 代码高亮(流式中不 highlight,省 CPU)
-    if (ctx.body) {
-      ctx.body.innerHTML = renderMd(ctx.acc);
-      if (ctx.card) highlightIn(ctx.card);
-    }
-  } finally {
-    if (ctx.body) ctx.body.classList.remove("streaming");
-    state.liveRuns.delete(ctx.taskId);
-    state.streaming = state.liveRuns.size > 0;
-    if (state.taskId === ctx.taskId) {
-      hint.textContent = ctx.lastUsageHint || "就绪";
-      setActionMode("idle");
-    }
-  }
-  // 刷新 task meta + messages(拿真实持久化的);失败路径已退出,这里不再跑
-  loadTaskList();
-  if (state.taskId === ctx.taskId) {
-    await loadMessages();
-    loadFiles();  // 回复结束后右侧文件面板同步刷新(可能有新写入 / 修改的产物)
-    refreshConcurrentWarnings();  // 自己 task 收尾,顺便清/更新 banner(同 wd 邻居可能也变了)
-  }
-}
-
-async function consumeSseStream(url, asstCard, ctx) {
-  const r = await fetch(url, {
-    headers: { "Authorization": "Bearer " + state.token, "Accept": "text/event-stream" },
-  });
-  if (!r.ok) throw new Error(r.status + " " + r.statusText);
-  const reader = r.body.getReader();
-  const dec = new TextDecoder();
-  let buf = "";
-  setRunHint(ctx, "接收中…");
-  while (true) {
-    const { value, done } = await reader.read();
-    if (done) return;
-    buf += dec.decode(value, { stream: true });
-    while (true) {
-      const idx = buf.indexOf("\n\n");
-      if (idx < 0) break;
-      const frame = buf.slice(0, idx);
-      buf = buf.slice(idx + 2);
-      const ev = parseSseFrame(frame);
-      if (!ev) continue;
-      handleSseEvent(ev, asstCard, ctx);
-      if (ev.event === "done" || ev.event === "error") {
-        ctx.terminal = true;
-        return;
-      }
-    }
-  }
-}
-
-function parseSseFrame(frame) {
-  const lines = frame.split("\n");
-  let event = "msg"; let dataLines = [];
-  for (const ln of lines) {
-    if (ln.startsWith(":")) continue;  // comment
-    if (ln.startsWith("event:")) event = ln.slice(6).trim();
-    else if (ln.startsWith("data:")) dataLines.push(ln.slice(5).replace(/^ /, ""));
-  }
-  if (!dataLines.length) return { event, data: null };
-  const raw = dataLines.join("\n");
-  let data = null;
-  try { data = JSON.parse(raw); } catch (e) { data = raw; }
-  return { event, data };
-}
-
-function handleSseEvent(ev, asstCard, ctx) {
-  const t = ev.event;
-  asstCard = asstCard || ctx.card || createLiveAssistantCard(ctx);
-  ctx.card = asstCard;
-  ctx.body = ctx.body || asstCard.querySelector(".body");
-  const stream = $("chat-stream");
-  const visible = state.taskId === ctx.taskId;
-  // 用户拖到上面看历史时不抢滚动,只在贴底时跟流
-  const nearBottom = visible && (stream.scrollHeight - stream.scrollTop - stream.clientHeight < 120);
-  if (t === "llm_start") {
-    ctx.contextStats = ev.data || {};
-    setRunHint(ctx, formatContextStats(ctx.contextStats));
-  } else if (t === "llm_end") {
-    ctx.lastUsageHint = formatUsageStats(ev.data || {}, ctx.contextStats);
-    setRunHint(ctx, ctx.lastUsageHint);
-  } else if (t === "text" && ev.data && ev.data.delta) {
-    ctx.acc += ev.data.delta;
-    // rAF 节流:每帧最多 1 次重渲染,流式 token 高频时不抖
-    if (!ctx.pending) {
-      ctx.pending = true;
-      requestAnimationFrame(() => {
-        ctx.body.innerHTML = renderMd(ctx.acc);
-        ctx.pending = false;
-        if (nearBottom) stream.scrollTop = stream.scrollHeight;
-      });
-    }
-  } else if (t === "tool_call") {
-    const fn = (ev.data && ev.data.name) || "?";
-    const args = (ev.data && ev.data.args) || "";
-    const argsStr = typeof args === "string" ? args : JSON.stringify(args, null, 2);
-    const label = toolActivityLabel(fn, args);
-    const det = document.createElement("details");
-    det.className = "tool-call";
-    det.innerHTML = `<summary>${escapeHtml(label)}</summary><pre>${escapeHtml(argsStr)}</pre>`;
-    asstCard.appendChild(det);
-    const wd = _workingDirName(ctx.workingDir);
-    const isProducer = ARTIFACT_PRODUCING_TOOLS.has(fn);
-    const fresh = isProducer
-      ? extractArtifactRels(argsStr, wd).filter(r => !ctx.seenRels.has(r))
-      : [];
-    fresh.forEach(r => ctx.seenRels.add(r));
-    const barHtml = renderArtifactBarHtml(fresh, isProducer);
-    if (barHtml) {
-      asstCard.insertAdjacentHTML("beforeend", barHtml);
-      if (isProducer) upgradeMediaArtifacts(asstCard);
-    }
-  } else if (t === "tool_result") {
-    const txt = (ev.data && ev.data.result) || "";
-    const txtStr = typeof txt === "string" ? txt : JSON.stringify(txt, null, 2);
-    const toolName = (ev.data && ev.data.name) || "";
-    const banner = extractMediaBanner(toolName, txtStr);
-    const det = document.createElement("details");
-    det.className = "tool-call";
-    det.innerHTML = `<summary>工具结果${banner}</summary><pre>${escapeHtml(txtStr)}</pre>`;
-    asstCard.appendChild(det);
-    const wd = _workingDirName(ctx.workingDir);
-    const isProducer = ARTIFACT_PRODUCING_TOOLS.has(toolName);
-    const fresh = isProducer
-      ? extractArtifactRels(txtStr, wd).filter(r => !ctx.seenRels.has(r))
-      : [];
-    fresh.forEach(r => ctx.seenRels.add(r));
-    const barHtml = renderArtifactBarHtml(fresh, isProducer);
-    if (barHtml) {
-      asstCard.insertAdjacentHTML("beforeend", barHtml);
-      if (isProducer) upgradeMediaArtifacts(asstCard);
-    }
-    if (visible) scheduleFilesRefresh();  // 工具调用结果回来,FS 可能被改了,debounce 刷新右侧
-  } else if (t === "cancelled") {
-    const badge = document.createElement("div");
-    badge.className = "cancelled-badge";
-    badge.textContent = "已停止";
-    asstCard.appendChild(badge);
-  } else if (t === "error") {
-    const msg = (ev.data && (ev.data.msg || ev.data.error)) || JSON.stringify(ev.data);
-    appendRunError(ctx, msg);
-  }
-  if (nearBottom) stream.scrollTop = stream.scrollHeight;
-}
-
-function appendErrorCard(msg) {
-  const card = document.createElement("div");
-  card.className = "msg error";
-  card.innerHTML = `<div class="role">错误</div><div class="body">${escapeHtml(msg)}</div>`;
-  $("chat-stream").appendChild(card);
-  $("chat-stream").scrollTop = $("chat-stream").scrollHeight;
-}
-
-// ───── done / abandon / delete / export ─────
-$("btn-done").onclick = () => state.taskId && setTaskStatus(state.taskId, "completed", (state.taskMeta && state.taskMeta.name) || "");
-$("btn-abandon").onclick = () => state.taskId && setTaskStatus(state.taskId, "abandoned", (state.taskMeta && state.taskMeta.name) || "");
-$("btn-delete-task").onclick = () => {
-  if (!state.taskId) return;
-  const t = state.taskMeta || {};
-  deleteTask(state.taskId, t.name || "(未命名)", t.n_messages || 0);
-};
-$("btn-export").onclick = () => state.taskId && exportTask(state.taskId);
-$("btn-clear-msgs").onclick = () => {
-  if (!state.taskId) return;
-  const t = state.taskMeta || {};
-  clearMessages(state.taskId, t.name || "(未命名)", t.n_messages || 0);
-};
-
-async function clearMessages(tid, name, nMsg) {
-  if (!confirm(`确认清空「${name}」的对话(${nMsg} 条消息)?\n\n将删除全部对话历史并重置 token 计数;工作目录下的文件保留。`)) return;
-  try {
-    const updated = await api("POST", "/v1/tasks/" + tid + "/clear");
-    if (state.taskId === tid) {
-      state.taskMeta = updated;
-      renderChatMeta();
-      renderMessages([]);
-      $("chat-hint").textContent = "对话已清空";
-    }
-    loadTaskList();
-  } catch (e) {
-    if (e.status === 401) { logout(); return; }
-    alert("清空失败:" + e.message);
-  }
-}
-
-async function setTaskStatus(tid, status, name) {
-  const labels = { completed: "已完成", abandoned: "已废弃" };
-  if (!confirm(`确认将「${name || tid.slice(0,8)}」置为「${labels[status] || status}」?`)) return;
-  try {
-    await api("PATCH", "/v1/tasks/" + tid, { status });
-    if (state.taskId === tid) await selectTask(tid);
-    loadTaskList();
-  } catch (e) {
-    if (e.status === 401) { logout(); return; }
-    alert("操作失败:" + e.message);
-  }
-}
-
-async function deleteTask(tid, name, nMsg) {
-  if (!confirm(`确认硬删除任务「${name}」(${nMsg} 条消息)?\n\n将清掉对话历史和 DB 行,但工作目录下的文件保留。`)) return;
-  try {
-    await api("DELETE", "/v1/tasks/" + tid);
-    if (state.taskId === tid) {
-      if (state.evtSrc) { state.evtSrc.close(); state.evtSrc = null; }
-      state.taskId = null;
-      state.taskMeta = null;
-      state.concurrentWarnings = [];
-      renderConcurrentWarning();
-      $("chat-meta").innerHTML = `<span class="muted">(未选中任务)</span>`;
-      $("chat-stream").innerHTML = `<div class="empty">请在左侧选一个任务</div>`;
-      $("chat-form").style.display = "none";
-      $("btn-done").disabled = true;
-      $("btn-abandon").disabled = true;
-      $("btn-delete-task").disabled = true;
-      $("btn-export").disabled = true;
-      $("btn-clear-msgs").disabled = true;
-    }
-    loadTaskList();
-    loadFiles();
-  } catch (e) {
-    if (e.status === 401) { logout(); return; }
-    alert("删除失败:" + e.message);
-  }
-}
-
-function exportTask(tid) {
-  fetch("/v1/tasks/" + tid + "/export", {
-    headers: { "Authorization": "Bearer " + state.token },
-  }).then(async (r) => {
-    if (!r.ok) { alert("导出失败:" + r.status); return; }
-    const blob = await r.blob();
-    const a = document.createElement("a");
-    a.href = URL.createObjectURL(blob);
-    a.download = "chat_" + tid.slice(0, 8) + ".docx";
-    document.body.appendChild(a); a.click();
-    setTimeout(() => { URL.revokeObjectURL(a.href); a.remove(); }, 1000);
-  });
-}
 
 // ───── Esc 关弹窗栈(跨模块协调:chpw/选入/文件预览/小预览)─────
 document.addEventListener("keydown", (e) => {
diff --git a/web/static/js/newtask.js b/web/static/js/newtask.js
index 00e580e..940f81c 100644
--- a/web/static/js/newtask.js
+++ b/web/static/js/newtask.js
@@ -6,7 +6,7 @@ import { state } from "./state.js";
 import { api } from "./api.js";
 import { escapeHtml } from "./format.js";
 import { logout } from "./auth.js";
-import { loadModels, loadTaskList, selectTask } from "./main.js";
+import { loadModels, loadTaskList, selectTask } from "./chat.js";
 
 // ───── new task ─────
 // wd 二级 input 默认跟随 name;用户一旦手改二级 input → 脱钩;清空二级 input 重置 flag