diff --git a/Agent.md b/Agent.md
index e99143ca..eb6a3cb9 100644
--- a/Agent.md
+++ b/Agent.md
@@ -85,7 +85,7 @@ Usage: say "tool loop" for the whole process, "round N" for a single LLM request
   - Streaming chat with delta rendering (16ms batching), markdown on done (marked + DOMPurify + local highlight.js subset), tool call status cards (2000-char truncation + expand)
   - Session list/switch/new/delete + right-click rename (context menu, #423) synced with daemon; own-stream busy lock (G65); broadcast streams from other clients tagged "来自其他客户端"
   - Disconnect/reconnect: red status dot, auto daemon respawn (stale-port detection), session resume, input bar restored on disconnect (no 30s fake-timeout)
-  - Unit tests `npm test` (255: 45 daemon_client + 19 conn-manager + 22 app-commands + 127 renderer smoke + 16 i18n + 7 integration + 3 commands + 7 build-config + 7 gui-state + 2 tool-group); RESPONSE_TYPES mirror daemon protocol verified against `daemon.py`
+  - Unit tests `npm test` (257: 45 daemon_client + 19 conn-manager + 22 app-commands + 129 renderer smoke + 16 i18n + 7 integration + 3 commands + 7 build-config + 7 gui-state + 2 tool-group); RESPONSE_TYPES mirror daemon protocol verified against `daemon.py`
 - **Scheduled tasks** — Task generalization + CRUD (rant 2026-08-12T18:23:15, #709/#710/#711)
   - Task handler generalized: `TaskHandler` (renamed from `EvolutionHandler`), repo-configured self-heal for any project, template lookup builtin → `~/.emrg/task-templates/<name>.md` → fallback
   - Daemon commands: `task_create/update/delete` + `task_template_create/list/update/delete` (tasks stored in `~/.emrg/tasks.yml`, custom type templates in `~/.emrg/task-templates/`)
@@ -119,7 +119,7 @@ pkill -f "emrg.server"; rm -f ~/.emrg/emrgd.port; python -m emrg
 ```
 
 Python: `uv run pytest tests/ -v` (825) — import check: `uv run python -c "from emrg.client.app import run_client"`
-GUI: `cd emrg/gui && npm test` (255: 45 daemon_client + 19 conn-manager + 22 app-commands + 127 renderer smoke + 16 i18n + 7 integration + 3 commands + 7 build-config + 7 gui-state + 2 tool-group) — syntax: `node --check main.js preload.js daemon_client.js renderer/js/*.js`
+GUI: `cd emrg/gui && npm test` (257: 45 daemon_client + 19 conn-manager + 22 app-commands + 129 renderer smoke + 16 i18n + 7 integration + 3 commands + 7 build-config + 7 gui-state + 2 tool-group) — syntax: `node --check main.js preload.js daemon_client.js renderer/js/*.js`
 CI: `uv run pytest` (ubuntu + **windows-2025 matrix** — Windows pytest 回归在 PR CI 即失败，v0.2.29 教训 #725) + GUI tests + **actionlint workflow lint** (`rhysd/actionlint@v1.7.12` gate, #444 — workflow 解析错误在 PR CI 即失败，如 `if:` secrets 上下文)
 Re-trigger: `scripts/re-trigger-ci.sh [branch]` (workflow_dispatch, #527 — 替代空 commit 重触发：Actions outage 会整段丢弃 push 事件，dispatch 走 API 路径不受影响)
 
diff --git a/emrg/gui/renderer/css/components.css b/emrg/gui/renderer/css/components.css
index 7b9af41f..837fc9de 100644
--- a/emrg/gui/renderer/css/components.css
+++ b/emrg/gui/renderer/css/components.css
@@ -927,6 +927,16 @@ dialog::backdrop {
   color: var(--text-3);
   word-break: break-all;
 }
+/* rant 10:41:43：rant 详情 markdown —— 【】标题预处理后的 h4 层次 + 嵌套列表缩进可见 */
+.rant-md h4 {
+  margin: 10px 0 4px;
+  font-size: 13px;
+  color: var(--text-1);
+}
+.rant-md li > ul,
+.rant-md li > ol {
+  margin-left: 1em;
+}
 .task-actions {
   display: flex;
   gap: 4px;
diff --git a/emrg/gui/renderer/js/dialogs.js b/emrg/gui/renderer/js/dialogs.js
index dbaeeb80..d2f7fa0e 100644
--- a/emrg/gui/renderer/js/dialogs.js
+++ b/emrg/gui/renderer/js/dialogs.js
@@ -1305,16 +1305,20 @@ const Dialogs = (() => {
         const msg = r.message || "";
         const firstLine = (msg.split("\n").find((l) => l.trim() !== "") || "").replace(/^#{1,6}\s+/, "").replace(/^[>*\-\s]+/, "");
         row.appendChild(el("span", { class: "rant-col-content" }, firstLine || "—"));
-        // 详情展开（rant 21:36:01：完整 message 按 markdown 渲染 + 进度显示）
+        // 详情展开/收起（rant 10:41:43：点击已展开的本行 → 收起，不再无条件重建）
         row.addEventListener("click", async () => {
-          const detail = list.querySelector(".rant-detail");
-          if (detail) detail.remove();
+          const existing = row.nextElementSibling;
+          const isSelfDetail = existing && existing.classList.contains("rant-detail");
+          // 先移除所有已展开的详情（含其他行的）
+          list.querySelectorAll(".rant-detail").forEach((d) => d.remove());
+          if (isSelfDetail) return; // 点自己已展开 → 收起
           const detailRow = el("div", { class: "rant-detail", style: "padding:6px 8px;border-top:1px solid var(--border);font-size:var(--fs-secondary);" });
           detailRow.appendChild(el("div", { class: "rant-meta" }, `${ts || "—"} · ${r.project || "—"} · ${stText}`));
           const md = el("div", { class: "msg-body rant-md" });
           try {
             if (window.emrgMarkdown && window.emrgMarkdown.renderMarkdown) {
-              md.innerHTML = await window.emrgMarkdown.renderMarkdown(msg);
+              // rant 10:41:43：【】标题预处理（markdown 视觉层次；不破坏原文）
+              md.innerHTML = await window.emrgMarkdown.renderMarkdown(preprocessRantMarkdown(msg));
             } else {
               md.textContent = msg;
             }
@@ -1333,6 +1337,20 @@ const Dialogs = (() => {
     }
   }
 
+  // rant 10:41:43：rant 详情 markdown 预处理 —— 行首 【xxx】 段标记映射为标题级
+  // （【任务】→####），让整篇有视觉层次；仅短行（≤60 字符）转标题，长内容行保持正文。
+  // 原文保留（只加 #### 前缀，不删除/改写原文）。
+  function preprocessRantMarkdown(text) {
+    if (!text) return text || "";
+    return String(text).split("\n").map((line) => {
+      const t = line.trim();
+      if (/^【[^】]{1,24}】/.test(t) && t.length <= 60) {
+        return `#### ${t}`;
+      }
+      return line;
+    }).join("\n");
+  }
+
   function openRantForm() {
     const form = $("rant-form");
     if (!form) return;
@@ -1564,6 +1582,7 @@ const Dialogs = (() => {
     showProjectSessionsInPanel, // rant 14:10:14 P5：项目面板内嵌会话列表（测试复用）
     initRantPanel, // rant 14:10:14 P4：rant 面板初始化
     renderRantList, // rant 14:10:14 P4：rant 列表渲染（测试/刷新复用）
+    preprocessRantMarkdown, // rant 10:41:43：rant 详情 markdown 【】标题预处理（测试复用）
     setRantFilter, // rant 14:10:14 P4：rant 状态筛选（测试复用）
     openRantForm, // rant 14:10:14 P4：新建 rant 表单（测试复用）
     submitRantForm, // rant 14:10:14 P4：rant 表单提交（测试复用）
diff --git a/emrg/gui/test/renderer.smoke.test.js b/emrg/gui/test/renderer.smoke.test.js
index c3b47ea8..361d3de1 100644
--- a/emrg/gui/test/renderer.smoke.test.js
+++ b/emrg/gui/test/renderer.smoke.test.js
@@ -102,6 +102,13 @@ function makeEl(id) {
       if (i >= 0) this.parentNode.children.splice(i + 1, 0, c);
       else this.parentNode.children.push(c);
     },
+    get nextElementSibling() {
+      // 忠实 DOM：下一兄弟节点（rant 10:41:43 点击收起依赖 row.nextElementSibling）
+      if (!this.parentNode) return null;
+      const i = this.parentNode.children.indexOf(this);
+      if (i < 0) return null;
+      return this.parentNode.children[i + 1] || null;
+    },
     remove() {
       // 真实脱离父节点（chat.js handleToolEnd 移除 .tool-spinner）
       if (this.parentNode) {
@@ -3270,6 +3277,56 @@ test("rant 14:10:14 P4：rant 面板列表（5 列 + 状态徽标三态 + 筛选
   assert.strictEqual(sent.message, "希望支持 X");
 });
 
+test("rant 10:41:43：preprocessRantMarkdown —— 【】段标记映射标题 + 原文保留 + 长行不转", () => {
+  const { ctx } = makeSandbox();
+  const pp = (s) => vm.runInContext(`EMRG_Dialogs.preprocessRantMarkdown(${JSON.stringify(s)})`, ctx);
+  // 短行 【xxx】 → #### 标题（原文保留，仅加前缀）
+  const out1 = pp("【任务】\n宿主要求：显示任务状态。\n【修改方案】\n加倒计时。");
+  assert.ok(out1.includes("#### 【任务】"), `【任务】应转 h4 标题：${out1}`);
+  assert.ok(out1.includes("#### 【修改方案】"), `【修改方案】应转 h4：${out1}`);
+  assert.ok(out1.includes("宿主要求：显示任务状态。"), "正文行保持原文");
+  // 长行（>60 字符，如带完整设计的 rant 标题）→ 不转标题，保持正文
+  const longLine = "【GUI 任务管理：显示任务当前状态 + 下次运行倒计时——完整设计如下，照抄实施，勿需再读文档】";
+  const out2 = pp(longLine);
+  assert.strictEqual(out2, longLine, "长行不应转标题");
+  // 空/非字符串安全
+  assert.strictEqual(pp(""), "", "空串安全");
+  assert.strictEqual(pp(null), "", "null 安全");
+});
+
+test("rant 10:41:43：rant 详情点击收起 —— 再点已展开行 → 收起；点其他行 → 换展开", async () => {
+  const rants = [
+    { timestamp: "2026-08-15T10:00:00", project: "emrg", status: "pending", progress: null, message: "【任务】\n第一条" },
+    { timestamp: "2026-08-15T11:00:00", project: "emrg", status: "pending", progress: null, message: "【任务】\n第二条" },
+  ];
+  const { ctx, els } = makeSandbox({
+    listRants: async () => rants,
+    listProjects: async () => [],
+  });
+  await tick();
+  await vm.runInContext("App.openRantsPanel()", ctx);
+  await tick();
+  const list = els["rant-list"];
+  const rows = list.children.filter((c) => c.className.includes("task-row"));
+  assert.strictEqual(rows.length, 2);
+  // 点行0 → 展开
+  rows[0].click();
+  await tick();
+  assert.ok(list.querySelector(".rant-detail"), "点行0应展开详情");
+  // 再点行0 → 收起（修复前：删+建 → 永远展开）
+  rows[0].click();
+  await tick();
+  assert.strictEqual(list.querySelector(".rant-detail"), null, "再点已展开行应收起");
+  // 点行0 → 展开；点行1 → 旧的收起、行1 展开（行为保持）
+  rows[0].click();
+  await tick();
+  assert.ok(list.querySelector(".rant-detail"), "行0展开");
+  rows[1].click();
+  await tick();
+  const details = list.children.filter((c) => c.className.includes("rant-detail"));
+  assert.strictEqual(details.length, 1, "切换查看不同 rant → 旧的收起新的展开（仅 1 个详情）");
+});
+
 test("rant 21:36:01/21:38:25/21:46:53：三面板标题 + Rant 列头 + 项目 hint 移除 + i18n.apply 保留控件", async () => {
   const htmlSrc = fs.readFileSync(path.join(__dirname, "..", "renderer", "index.html"), "utf-8");
   const i18nSrc = fs.readFileSync(path.join(__dirname, "..", "renderer", "js", "i18n.js"), "utf-8");