fix(frontend): 完整恢复 chat.js UI 业务逻辑 + 折叠按钮图标/标题切换

背景：之前 commit a16996b 从 git 520c9e2 恢复 chat.html 内联 JS 段到 chat.js
时，提取过程因 PowerShell 5.1 `>` 重定向默认按 UTF-16 LE 写入文件、
后续 UTF-8 解码时字节被错误解读，导致 chat.js 包含大量乱码字符和未关闭
的字符串字面量。Node.js 解析时报 `Unexpected token ':'` 错误。

本次重新提取：
- 用 `git cat-file -p` 直接获取原 chat.html 的 UTF-8 原始字节
- 找到内联 `<script>...</script>` 段（从 byte 24765 到 54899，共 30134 字节）
- 按 UTF-8 解码后写回 chat.js（30279 字节）
- 验证 Node.js 解析通过

变更：
- chat.js 整体重写：27094 字节 → 30306 字节
- 恢复正确的简体中文 UI 文案（"请新建项目或者选择项目"等）
- 恢复正确的字符串字面量（之前是乱码字符）

同时恢复 commit 264054b 的折叠按钮增强：
- toggleSidebar 切换图标 '«' / '»'
- 切换 title "折叠侧边栏" / "展开侧边栏"
- 切换 data-state 'expanded' / 'collapsed'

零行为变更：JS 内容完全从 git 520c9e2 恢复，
只是 264054b 的 toggleSidebar 增强被应用。

验证（node --check）：
- chat.js 0 errors
- /static/chat.js 服务端响应 200, 30306 bytes

后续浏览器手测清单：
- [ ] 侧边栏折叠按钮：点击正常切换 + 图标/标题变化
- [ ] 项目下拉：弹出 + 切换项目
- [ ] 新建项目抽屉：滑入
- [ ] 发送消息：用户气泡 + 自动滚动
- [ ] 上传：选文件 + 上传进度

src/genesis/server/static/chat.js

@@ -1,20 +1,27 @@
 // src/genesis/server/static/chat.js
-// Genesis Chat UI 涓氬姟閫昏緫锛坴1 鎷嗗垎鑷師 chat.html 鍐呰仈 <script> 娈碉紝琛?510-1179锛塦n// 涓婁竴杞?chat.html 鎷嗗垎 CSS 鏃惰鍒犳暣娈靛唴鑱?JS锛屽鑷存墍鏈?UI 鎸夐挳澶辨晥
+// Genesis Chat UI 业务逻辑（v1 拆分自原 chat.html 内联 <script> 段，行 1-704）
-// 鏈瀹屾暣鎭㈠锛岄浂琛屼负鍙樻洿
+// 本次完整恢复，零行为变更
+
 let sid = null;
 let progressWs = null;
-let draftProject = null;     // 涓嬩竴绌虹櫧浼氳瘽灏嗙粦瀹?宸茬粦鐨勯」鐩紙鍘?currentProject锛?let activeProject = null;    // 褰撳墠宸茶惤搴撲細璇濈粦瀹氱殑椤圭洰锛堟潵鑷悗绔級
+let draftProject = null;     // 下一空白会话将绑定/已绑的项目（原 currentProject）
+let activeProject = null;    // 当前已落库会话绑定的项目（来自后端）
 let projects = [];
 let drawerOpen = false;
-let drawerSelected = null;   // 褰撳墠鎶藉眽涓紪杈戠殑椤圭洰鍚嶏紙null = 鏂板缓妯″紡锛?let lastTriggerEl = null;    // 鎵撳紑鎶藉眽/涓嬫媺鍓嶇殑鐒︾偣鍏冪礌锛圕1锛?let drawerDirty = false;     // 鎶藉眽琛ㄥ崟鏄惁鏈夋湭淇濆瓨鏀瑰姩锛圔6锛?  let drawerSnapshot = null;   // loadDrawerForm 鏃剁殑瀛楁蹇収锛圔6锛?
+let drawerSelected = null;   // 当前抽屉中编辑的项目名（null = 新建模式）
-// 鐘舵€侀€昏緫缁熶竴璧?chat_state.js锛涜嫢闈欐€佽矾鐢辨湭灏辩华鍒欏洖閫€鍐呰仈瀹炵幇锛岄伩鍏嶆暣椤佃剼鏈穿婧?const GenesisState = window.GenesisState || {
+let lastTriggerEl = null;    // 打开抽屉/下拉前的焦点元素（C1）
+let drawerDirty = false;     // 抽屉表单是否有未保存改动（B6）
+  let drawerSnapshot = null;   // loadDrawerForm 时的字段快照（B6）
+
+// 状态逻辑统一走 chat_state.js；若静态路由未就绪则回退内联实现，避免整页脚本崩溃
+const GenesisState = window.GenesisState || {
   autoBindProject: (d, p) => (d === null && p.length ? p[0].name : (d && !p.find(x => x.name === d) ? (p.length ? p[0].name : null) : d)),
   shouldHideUploadSelect: () => false,
   resolveUploadType: (_a, _d, v) => v,
   computeDrawerSnapshot: (f) => f.map(x => (x == null ? '' : String(x)).trim()).join(String.fromCharCode(1)),
   isDrawerDirty: (n, s) => n !== s,
-  buildWelcome: (d) => d === null ? '璇锋柊寤洪」鐩垨鑰呴€夋嫨椤圭洰'
+  buildWelcome: (d) => d === null ? '请新建项目或者选择项目'
-    : '浣犲ソ锛佹垜鏄?Genesis 姒傝璁捐涔︾敓鎴?Agent銆傝鍏堜笂浼犺浠跺畾涔?xlsx锛堟ā鏉?瑙勫垯/浠ｇ爜搴撳凡鐢遍」鐩€? + d + '銆嶆彁渚涳級銆?,
+    : '你好！我是 Genesis 概要设计书生成 Agent。请先上传要件定义 xlsx（模板/规则/代码库已由项目「' + d + '」提供）。',
 };
 
 const chatEl = document.getElementById('chat');
@@ -34,7 +41,7 @@ function addMsg(role, html) {
   return m;
 }
 function esc(s) { return String(s).replace(/[&<>"']/g, c => ({'&':'&amp;','<':'&lt;','>':'&gt;','"':'&quot;',"'":'&#39;'}[c])); }
-function showTyping() { return addMsg('assistant', '<span class="typing">鎬濊€冧腑鈥?/span>'); }
+function showTyping() { return addMsg('assistant', '<span class="typing">思考中…</span>'); }
 
 async function api(method, url, body) {
   const opt = { method, headers: {} };
@@ -45,18 +52,20 @@ async function api(method, url, body) {
   return data;
 }
 
-// ---------- 浼氳瘽鍒楄〃 ----------
+// ---------- 会话列表 ----------
 async function refreshSessions() {
   const box = document.getElementById('session-list');
-  if (draftProject === null) { box.innerHTML = ''; return; }  // 鏈€夐」鐩?鈫?鏃犲巻鍙?  const list = await api('GET', '/api/sessions?user_id=default&project=' + encodeURIComponent(draftProject));
+  if (draftProject === null) { box.innerHTML = ''; return; }  // 未选项目 → 无历史
+  const list = await api('GET', '/api/sessions?user_id=default&project=' + encodeURIComponent(draftProject));
   box.innerHTML = '';
   list.sort((a, b) => (b.updated_at || '').localeCompare(a.updated_at || ''));
   for (const s of list) {
     const el = document.createElement('div');
     el.className = 'sess' + (s.session_id === sid ? ' active' : '');
-    const proj = s.project ? ' 路 ' + esc(s.project) : '';
+    const proj = s.project ? ' · ' + esc(s.project) : '';
-    // P3鈥?锛氬彇棣栧瓧绗︼紙鍚腑鏂?鏃ユ枃/鑻辨枃锛変綔 avatar锛屽苟鐢ㄥ悕瀛?hash 閫夎壊锛岄伩鍏嶉噸鍚嶆贩娣?    const rawName = (s.name || '鏂?).trim();
+    // P3‑1：取首字符（含中文/日文/英文）作 avatar，并用名字 hash 选色，避免重名混淆
-    const avatar = rawName ? Array.from(rawName)[0] : '鏂?;
+    const rawName = (s.name || '新').trim();
+    const avatar = rawName ? Array.from(rawName)[0] : '新';
     const palette = ['#1a73e8', '#34a853', '#fbbc05', '#ea4335', '#8e24aa', '#0097a7', '#5f6368'];
     let h = 0;
     for (let i = 0; i < rawName.length; i++) h = (h * 31 + rawName.charCodeAt(i)) | 0;
@@ -64,10 +73,10 @@ async function refreshSessions() {
     el.innerHTML =
       '<div class="avatar" style="background:' + color + ';">' + esc(avatar) + '</div>' +
       '<div class="info">' +
-        '<div class="name">' + esc(s.name || '鏂颁細璇?) + '</div>' +
+        '<div class="name">' + esc(s.name || '新会话') + '</div>' +
         '<div class="meta">' + esc(s.status) + proj + '</div>' +
       '</div>' +
-      '<button class="del" title="鍒犻櫎浼氳瘽" aria-label="鍒犻櫎浼氳瘽 ' + esc(rawName) + '">脳</button>';
+      '<button class="del" title="删除会话" aria-label="删除会话 ' + esc(rawName) + '">×</button>';
     el.querySelector('.info').onclick = () => loadSession(s.session_id);
     const delBtn = el.querySelector('.del');
     delBtn.onclick = (ev) => { ev.stopPropagation(); deleteSession(s.session_id); };
@@ -76,28 +85,30 @@ async function refreshSessions() {
 }
 
 async function deleteSession(targetSid) {
-  if (!confirm('纭鍒犻櫎璇ヤ細璇濓紵姝ゆ搷浣滀笉鍙挙閿€銆?)) return;
+  if (!confirm('确认删除该会话？此操作不可撤销。')) return;
   try {
     await api('DELETE', '/api/sessions/' + encodeURIComponent(targetSid));
   } catch (e) {
-    addMsg('error', '鍒犻櫎澶辫触锛? + esc(String(e)));
+    addMsg('error', '删除失败：' + esc(String(e)));
     return;
   }
   if (targetSid === sid) {
-    // 鍒犻櫎鐨勬槸褰撳墠浼氳瘽 鈫?鑷姩鏂板缓骞舵竻绌?    await newSession();
+    // 删除的是当前会话 → 自动新建并清空
+    await newSession();
   } else {
     await refreshSessions();
   }
 }
 
-// ---------- 椤圭洰閰嶇疆 ----------
+// ---------- 项目配置 ----------
 async function loadProjects() {
   try {
     projects = await api('GET', '/api/projects');
   } catch (e) {
     projects = [];
   }
-  // 鍚姩鑷姩缁戦椤?/ 宸插垹椤圭洰鍥為€€棣栭」锛堢粺涓€鐢?GenesisState.autoBindProject 澶勭悊锛?  draftProject = GenesisState.autoBindProject(draftProject, projects);
+  // 启动自动绑首项 / 已删项目回退首项（统一由 GenesisState.autoBindProject 处理）
+  draftProject = GenesisState.autoBindProject(draftProject, projects);
   applyProjectContext();
   renderProjectSwitcher();
   renderDrawerList();
@@ -105,18 +116,18 @@ async function loadProjects() {
 }
 
 function applyProjectContext() {
-  psName.textContent = draftProject || '鏈€夋嫨';
+  psName.textContent = draftProject || '未选择';
 }
 
 function renderProjectSwitcher() {
   let html = '<div class="ps-item' + (draftProject === null ? ' active' : '') + '" data-name="">'
-    + '<span>涓嶉€夋嫨椤圭洰</span><span class="ps-check">鉁?/span></div>';
+    + '<span>不选择项目</span><span class="ps-check">✓</span></div>';
   for (const p of projects) {
     html += '<div class="ps-item' + (p.name === draftProject ? ' active' : '') + '" data-name="' + esc(p.name) + '">'
-      + '<span>' + esc(p.display_name || p.name) + '</span><span class="ps-check">鉁?/span></div>';
+      + '<span>' + esc(p.display_name || p.name) + '</span><span class="ps-check">✓</span></div>';
   }
   html += '<div class="ps-sep"></div>'
-    + '<div class="ps-item ps-manage" data-manage="1">+ 椤圭洰绠＄悊锛堟墦寮€鎶藉眽锛?/div>';
+    + '<div class="ps-item ps-manage" data-manage="1">+ 项目管理（打开抽屉）</div>';
   psMenu.innerHTML = html;
   psMenu.querySelectorAll('.ps-item[data-name]').forEach(it => {
     it.onclick = () => {
@@ -143,14 +154,15 @@ function toggleProjectSwitcher(force) {
   psMenu.classList.toggle('open', willOpen);
 }
 
-// ---------- 鎶藉眽 ----------
+// ---------- 抽屉 ----------
 function openProjectDrawer(projectName) {
   drawerOpen = true;
   toggleProjectSwitcher(false);
   drawer.classList.add('open');
   const sel = (projectName === undefined || projectName === null) ? drawerSelected : projectName;
   try { loadDrawerForm(sel); } catch (e) { console.error(e); }
-  renderDrawerList();   // 濮嬬粓娓叉煋宸︿晶鍒楄〃锛堝惈 +鏂板缓椤圭洰锛?}
+  renderDrawerList();   // 始终渲染左侧列表（含 +新建项目）
+}
 
 function closeProjectDrawer() {
   if (!guardDrawerDirty()) return;
@@ -186,11 +198,12 @@ function loadDrawerForm(projectName) {
     tplEl.value = ''; wrEl.value = ''; rulesEl.value = ''; codeEl.value = ''; designEl.value = '';
     delBtn.hidden = true;
   }
-  // B6锛氳褰曞瓧娈靛揩鐓х敤浜庤剰妫€娴?  drawerSnapshot = drawerSnapshotNow();
+  // B6：记录字段快照用于脏检测
+  drawerSnapshot = drawerSnapshotNow();
   renderDrawerList();
 }
 
-// B6锛氭娊灞夋湭淇濆瓨鍙樻洿瀹堝崼
+// B6：抽屉未保存变更守卫
 function drawerSnapshotNow() {
   return GenesisState.computeDrawerSnapshot([
     document.getElementById('pf-name').value,
@@ -207,17 +220,19 @@ function isDrawerDirty() {
   return GenesisState.isDrawerDirty(drawerSnapshotNow(), drawerSnapshot);
 }
 function guardDrawerDirty() {
-  if (isDrawerDirty()) return confirm('鏈夋湭淇濆瓨鐨勪慨鏀癸紝纭畾鏀惧純锛?);
+  if (isDrawerDirty()) return confirm('有未保存的修改，确定放弃？');
   return true;
 }
 
-// P0鈥慍锛氭娊灞夊瓧娈电骇绾㈡銆傚懡涓叧閿瓧 鈫?缁欏搴旇緭鍏ュ姞 .invalid 3 绉掑悗娓呴櫎銆?// 鍏抽敭瀛椾笌 store.py 鐨?ProjectConfigError 涓枃 label 瀵归綈銆?const PF_LABEL_TO_FIELD = {
+// P0‑C：抽屉字段级红框。命中关键字 → 给对应输入加 .invalid 3 秒后清除。
-  '椤圭洰鍚?: 'pf-name',
+// 关键字与 store.py 的 ProjectConfigError 中文 label 对齐。
-  '妯℃澘': 'pf-template',
+const PF_LABEL_TO_FIELD = {
-  '鍋氭垚璇存槑涔?: 'pf-write',
+  '项目名': 'pf-name',
-  '瑙勫垯': 'pf-rules',
+  '模板': 'pf-template',
-  '鏃㈡湁绯荤粺浠ｇ爜搴?: 'pf-code',
+  '做成说明书': 'pf-write',
-  '鏃㈡湁璁捐鏂囨。鐩綍': 'pf-design',
+  '规则': 'pf-rules',
+  '既有系统代码库': 'pf-code',
+  '既有设计文档目录': 'pf-design',
 };
 function clearPfInvalid() {
   ['pf-name','pf-display','pf-template','pf-write','pf-rules','pf-code','pf-design']
@@ -234,12 +249,13 @@ function flagPfInvalidByMessage(message) {
     }
   }
 }
-// 浠绘剰杈撳叆娓呮帀鑷韩绾㈡锛堥伩鍏?绾㈢潃杈撳叆"璇锛?['pf-name','pf-display','pf-template','pf-write','pf-rules','pf-code','pf-design']
+// 任意输入清掉自身红框（避免"红着输入"误导）
+['pf-name','pf-display','pf-template','pf-write','pf-rules','pf-code','pf-design']
   .forEach(id => document.getElementById(id).addEventListener('input', (e) => e.target.classList.remove('invalid')));
 
 function renderDrawerList() {
   let html = '<div class="drawer-item di-create' + (drawerSelected === null ? ' active' : '') + '" data-name="">'
-    + '<span class="di-new">锛?/span><span class="di-name">鏂板缓椤圭洰</span></div>';
+    + '<span class="di-new">＋</span><span class="di-name">新建项目</span></div>';
   for (const p of projects) {
     html += '<div class="drawer-item' + (p.name === drawerSelected ? ' active' : '') + '" data-name="' + esc(p.name) + '">'
       + '<span class="di-name">' + esc(p.display_name || p.name) + '</span></div>';
@@ -267,8 +283,8 @@ async function saveDrawerProject() {
     design_docs_dir: document.getElementById('pf-design').value.trim(),
   };
   if (!body.name) {
-    flagPfInvalidByMessage('椤圭洰鍚?);
+    flagPfInvalidByMessage('项目名');
-    addMsg('error', '椤圭洰鍚嶄笉鑳戒负绌?);
+    addMsg('error', '项目名不能为空');
     return;
   }
   try {
@@ -276,37 +292,37 @@ async function saveDrawerProject() {
     draftProject = cfg.name;
     drawerSelected = cfg.name;
     await loadProjects();
-    addMsg('assistant', '椤圭洰銆? + esc(cfg.display_name || cfg.name) + '銆嶅凡淇濆瓨銆?);
+    addMsg('assistant', '项目「' + esc(cfg.display_name || cfg.name) + '」已保存。');
     closeProjectDrawer();
   } catch (e) {
-    // 400 / PROJECT_CONFIG_INVALID锛氬瓧娈电骇绾㈡瀹氫綅
+    // 400 / PROJECT_CONFIG_INVALID：字段级红框定位
     flagPfInvalidByMessage(String(e));
-    addMsg('error', '淇濆瓨椤圭洰澶辫触锛? + esc(String(e)));
+    addMsg('error', '保存项目失败：' + esc(String(e)));
   }
 }
 
 async function deleteDrawerProject() {
   if (!drawerSelected) return;
-  if (!confirm('纭鍒犻櫎椤圭洰銆? + drawerSelected + '銆嶏紵姝ゆ搷浣滀笉鍙挙閿€銆?)) return;
+  if (!confirm('确认删除项目「' + drawerSelected + '」？此操作不可撤销。')) return;
   const deleted = drawerSelected;
   try {
     await api('DELETE', '/api/projects/' + encodeURIComponent(deleted));
   } catch (e) {
-    addMsg('error', '鍒犻櫎椤圭洰澶辫触锛? + esc(String(e)));
+    addMsg('error', '删除项目失败：' + esc(String(e)));
     return;
   }
-  addMsg('assistant', '椤圭洰銆? + esc(deleted) + '銆嶅凡鍒犻櫎銆?);
+  addMsg('assistant', '项目「' + esc(deleted) + '」已删除。');
-  // P1鈥慒锛氬厛璁颁綇琚垹鐨勶紝鍐嶆竻 drawerSelected锛涢伩鍏?鍏?null 鍚庢瘮杈?鎭掑亣 bug
+  // P1‑F：先记住被删的，再清 drawerSelected；避免"先 null 后比较"恒假 bug
   drawerSelected = null;
   if (draftProject === deleted) {
-    // 褰撳墠閫夌殑灏辨槸琚垹鐨勯」鐩?鈫?娓呯┖鍋忓ソ锛坅utoBindProject 浼氫粠鍓╀綑椤圭洰閲嶉€夛級
+    // 当前选的就是被删的项目 → 清空偏好（autoBindProject 会从剩余项目重选）
     draftProject = null;
   }
   await loadProjects();
   loadDrawerForm(null);
 }
 
-// ---------- 渚ц竟鏍忔姌鍙?----------
+// ---------- 侧边栏折叠 ----------
 function toggleSidebar(force) {
   const el = document.getElementById('sidebar');
   const willCollapse = force === undefined ? !el.classList.contains('collapsed') : !!force;
@@ -327,35 +343,39 @@ function toggleSidebar(force) {
   try { localStorage.setItem('genesis_sidebar_collapsed', willCollapse ? '1' : '0'); } catch (e) { /* localStorage 不可用时忽略 */ }
 }
 
-// ---------- 涓婁紶鍖猴細濮嬬粓鏄剧ず瀹屾暣绫诲瀷涓嬫媺 ----------
+// ---------- 上传区：始终显示完整类型下拉 ----------
-// P0鈥態锛氶€夐」鐩椂涔熷厑璁歌ˉ浼?template / write_instruction / rules / existing_system锛?// 涓嶅啀钘忚捣鍏ュ彛銆?椤圭洰宸查缃?template 鏃跺啀涓婁紶 template"鍦ㄤ笂浼犲鐢?confirm() 鏄惧紡纭銆?function updateUploadBar() {
+// P0‑B：选项目时也允许补传 template / write_instruction / rules / existing_system，
+// 不再藏起入口。"项目已预置 template 时再上传 template"在上传处用 confirm() 显式确认。
+function updateUploadBar() {
   const sel = document.getElementById('file-type');
   const hint = document.getElementById('proj-hint');
   if (sel) sel.style.display = '';
   if (!hint) return;
-  // 榛樿 file_type 浠嶄负 requirements锛堟渶甯哥敤锛夛紝浣嗕笅鎷夊缁堝彲鏀广€?  if (sel && sel.value !== 'requirements') sel.value = 'requirements';
+  // 默认 file_type 仍为 requirements（最常用），但下拉始终可改。
+  if (sel && sel.value !== 'requirements') sel.value = 'requirements';
   if (draftProject) {
-    hint.textContent = '榛樿涓婁紶瑕佷欢瀹氫箟 xlsx锛涘闇€琛ヤ紶妯℃澘/瑙勫垯/鏃㈡湁绯荤粺 zip锛岃鍦ㄤ笅鎷変腑閫夋嫨瀵瑰簲绫诲瀷銆?;
+    hint.textContent = '默认上传要件定义 xlsx；如需补传模板/规则/既有系统 zip，请在下拉中选择对应类型。';
   } else {
-    hint.textContent = '璇烽€夋嫨 file_type 鍚庝笂浼狅紙鏈€夐」鐩椂锛屾ā鏉?瑙勫垯浠嶅彲鎵嬪姩涓婁紶锛夈€?;
+    hint.textContent = '请选择 file_type 后上传（未选项目时，模板/规则仍可手动上传）。';
   }
 }
 
-// ---------- 绌烘€?娆㈣繋娓叉煋 ----------
+// ---------- 空态/欢迎渲染 ----------
 function renderEmptyOrWelcome() {
   chatEl.innerHTML = '';
-  // P1鈥慒锛氭杩庢枃鐢?GenesisState.buildWelcome 缁熶竴鏉ユ簮
+  // P1‑F：欢迎文由 GenesisState.buildWelcome 统一来源
   addMsg('assistant', GenesisState.buildWelcome(draftProject));
 }
 
-// ---------- 浼氳瘽鍒涘缓/鍔犺浇 ----------
+// ---------- 会话创建/加载 ----------
 async function newSession() {
    if (progressWs) { try { progressWs.close(); } catch (e) {} } progressWs = null;
   sid = null;
   activeProject = null;
-  // 淇濈暀 draftProject锛堝綋鍓嶉《鏍忓凡閫夐」鐩級锛屼娇鏂颁細璇濈户鎵块」鐩粦瀹氾紙搂4.2锛?  try { localStorage.removeItem('genesis_session'); } catch (e) { /* 蹇界暐 */ }
+  // 保留 draftProject（当前顶栏已选项目），使新会话继承项目绑定（§4.2）
+  try { localStorage.removeItem('genesis_session'); } catch (e) { /* 忽略 */ }
   chatEl.innerHTML = '';
-  badge.textContent = '鏈垱寤轰細璇?;
+  badge.textContent = '未创建会话';
   updateUploadBar();
   await refreshRagStats();
   await refreshSessions();
@@ -367,10 +387,11 @@ async function loadSession(id) {
     const rec = await api('GET', '/api/sessions/' + encodeURIComponent(id));
     sid = id;
     activeProject = rec.project || null;
-    // P1鈥慏锛氫笉鍐嶉殣寮忚鐩?draftProject銆備細璇濅簨瀹?activeProject)涓庣敤鎴峰亸濂?draftProject)
+    // P1‑D：不再隐式覆盖 draftProject。会话事实(activeProject)与用户偏好(draftProject)
-    // 鍒嗗眰锛涜嫢涓嶄竴鑷达紝鐢辨彁绀烘潯璁╃敤鎴蜂富鍔ㄩ€夋嫨銆?    // draftProject = rec.project || null;   // 鍒犻櫎锛氬師琛屼负浼氭倓鎮勬敼鐢ㄦ埛鍋忓ソ
+    // 分层；若不一致，由提示条让用户主动选择。
+    // draftProject = rec.project || null;   // 删除：原行为会悄悄改用户偏好
     applyProjectContext();
-    badge.textContent = '浼氳瘽: ' + (rec.name || '鏂颁細璇?);
+    badge.textContent = '会话: ' + (rec.name || '新会话');
     if (progressWs) { try { progressWs.close(); } catch (e) {} }
     progressWs = GenesisWS.connectProgressWs(id, {
       onProgress: (e) => GenesisWS.applyProgressEvent(e, (role, text) => addMsg(role, text)),
@@ -386,21 +407,24 @@ async function loadSession(id) {
     updateUploadBar();
     await refreshRagStats();
     await refreshSessions();
-    try { localStorage.setItem('genesis_session', sid); } catch (e) { /* 蹇界暐 */ }
+    try { localStorage.setItem('genesis_session', sid); } catch (e) { /* 忽略 */ }
     renderProjectMismatchHint();
   } catch (e) {
-    addMsg('error', '鍔犺浇浼氳瘽澶辫触锛? + esc(String(e)));
+    addMsg('error', '加载会话失败：' + esc(String(e)));
   }
 }
 
-// P1鈥慏锛氶」鐩笉鍖归厤鎻愮ず鏉°€俛ctiveProject 涓?draftProject 涓嶄竴鑷存椂鏄剧ず锛?// "鍒囧埌璇ラ」鐩? 鈫?鍐?draftProject = activeProject锛屽埛鏂帮紱
+// P1‑D：项目不匹配提示条。activeProject 与 draftProject 不一致时显示，
-// "淇濈暀"      鈫?鍐欏叆 sessionStorage 鏍囪锛屽埛鏂帮紱鍚庣画 loadSession 涓嶅啀鎻愮ず銆?function renderProjectMismatchHint() {
+// "切到该项目" → 写 draftProject = activeProject，刷新；
+// "保留"      → 写入 sessionStorage 标记，刷新；后续 loadSession 不再提示。
+function renderProjectMismatchHint() {
   const old = document.getElementById('proj-mismatch-hint');
   if (old) old.remove();
   if (!sid) return;
   if (!activeProject) return;
   if (activeProject === draftProject) return;
-  // 宸?淇濈暀"杩囨湰浼氳瘽鐨勪笉鍐嶆彁绀?  let skipped = {};
+  // 已"保留"过本会话的不再提示
+  let skipped = {};
   try { skipped = JSON.parse(sessionStorage.getItem('genesis_skipped_project_hint') || '{}'); } catch (e) { skipped = {}; }
   if (skipped[sid] === activeProject) return;
   const wrap = document.createElement('div');
@@ -408,11 +432,11 @@ async function loadSession(id) {
   wrap.className = 'msg assistant';
   wrap.innerHTML =
     '<div class="bubble">' +
-    '璇ヤ細璇濆睘浜庨」鐩?<strong>' + esc(activeProject) + '</strong>锛? +
+    '该会话属于项目 <strong>' + esc(activeProject) + '</strong>，' +
-    '褰撳墠椤舵爮椤圭洰涓?<strong>' + esc(draftProject || '锛堟湭閫夋嫨锛?) + '</strong>銆? +
+    '当前顶栏项目为 <strong>' + esc(draftProject || '（未选择）') + '</strong>。' +
     '<div class="actions">' +
-    '<a href="#" data-act="switch">鍒囧埌璇ラ」鐩?/a>' +
+    '<a href="#" data-act="switch">切到该项目</a>' +
-    '<a href="#" data-act="keep">淇濈暀褰撳墠椤圭洰</a>' +
+    '<a href="#" data-act="keep">保留当前项目</a>' +
     '</div></div>';
   chatEl.prepend(wrap);
   wrap.querySelector('[data-act="switch"]').onclick = (e) => {
@@ -429,27 +453,29 @@ async function loadSession(id) {
     try {
       skipped[sid] = activeProject;
       sessionStorage.setItem('genesis_skipped_project_hint', JSON.stringify(skipped));
-    } catch (er) { /* 蹇界暐 */ }
+    } catch (er) { /* 忽略 */ }
     wrap.remove();
   };
 }
 
-// P2鈥慔锛歴end() in-flight 閿侊紝闃叉蹇€熷弻鍑讳骇鐢熼噸澶嶈姹?let sendInFlight = false;
+// P2‑H：send() in-flight 锁，防止快速双击产生重复请求
+let sendInFlight = false;
 async function send() {
-  if (sendInFlight) return;   // in-flight 鏈熼棿鍐嶆杩涘叆鐩存帴蹇界暐
+  if (sendInFlight) return;   // in-flight 期间再次进入直接忽略
   const text = inputEl.value.trim();
   if (!text) return;
   sendInFlight = true;
   if (!sid) {
-    // 棣栨潯娑堟伅锛氬厛钀藉簱浼氳瘽锛圖-v4锛?    try {
+    // 首条消息：先落库会话（D-v4）
+    try {
       const d = await api('POST', '/api/sessions', { user_id: 'default', project: draftProject || null });
       sid = d.session_id;
       activeProject = draftProject || null;
-      badge.textContent = '浼氳瘽: ' + (d.name || '鏂颁細璇?);
+      badge.textContent = '会话: ' + (d.name || '新会话');
-      try { localStorage.setItem('genesis_session', sid); } catch (e) { /* 蹇界暐 */ }
+      try { localStorage.setItem('genesis_session', sid); } catch (e) { /* 忽略 */ }
       await refreshSessions();
     } catch (e) {
-      addMsg('error', '鍒涘缓浼氳瘽澶辫触锛? + esc(String(e)));
+      addMsg('error', '创建会话失败：' + esc(String(e)));
       return;
     }
   }
@@ -473,15 +499,15 @@ async function send() {
     const s = res.status;
     if (s === 'done' || s === 'writing') {
       replyHtml += '<div class="actions">'
-        + '<a href="/api/sessions/' + sid + '/result/download">涓嬭浇 docx</a>'
+        + '<a href="/api/sessions/' + sid + '/result/download">下载 docx</a>'
-        + '<a href="/api/sessions/' + sid + '/result/preview">棰勮</a>'
+        + '<a href="/api/sessions/' + sid + '/result/preview">预览</a>'
-        + '<a href="/api/sessions/' + sid + '/result/impact-report">褰卞搷璋冩煡涔?/a>'
+        + '<a href="/api/sessions/' + sid + '/result/impact-report">影响调查书</a>'
-        + '<a href="/api/sessions/' + sid + '/result/qa-report">QA 鎶ュ憡</a></div>';
+        + '<a href="/api/sessions/' + sid + '/result/qa-report">QA 报告</a></div>';
     }
     addMsg('assistant', replyHtml);
   } catch (e) {
     typing.remove();
-    addMsg('error', '璇锋眰澶辫触锛? + esc(String(e)));
+    addMsg('error', '请求失败：' + esc(String(e)));
   } finally {
     sendInFlight = false;
     sendBtn.disabled = false;
@@ -498,7 +524,7 @@ document.getElementById('drawer-close').addEventListener('click', closeProjectDr
 document.getElementById('pf-save').addEventListener('click', saveDrawerProject);
 document.getElementById('pf-delete').addEventListener('click', deleteDrawerProject);
 
-// ---------- P0鈥慉锛歊AG 寮€鍏?+ 鐘舵€佸窘鏍?+ 寮€濮嬪奖鍝嶈皟鏌?----------
+// ---------- P0‑A：RAG 开关 + 状态徽标 + 开始影响调查 ----------
 const ragEnabledEl = document.getElementById('rag-enabled');
 const ragStatsEl   = document.getElementById('rag-stats');
 const ragBarEl     = document.getElementById('rag-bar');
@@ -509,12 +535,13 @@ function readRagFlag() {
   try { return localStorage.getItem(RAG_LS_KEY) === '1'; } catch (e) { return false; }
 }
 function writeRagFlag(v) {
-  try { localStorage.setItem(RAG_LS_KEY, v ? '1' : '0'); } catch (e) { /* 蹇界暐 */ }
+  try { localStorage.setItem(RAG_LS_KEY, v ? '1' : '0'); } catch (e) { /* 忽略 */ }
 }
 ragEnabledEl.addEventListener('change', () => { writeRagFlag(ragEnabledEl.checked); updateImpactButton(); });
 
 async function refreshRagStats() {
-  // 鏃?sid 鈫?闅愯棌 RAG 鏉?  if (!sid) {
+  // 无 sid → 隐藏 RAG 条
+  if (!sid) {
     ragBarEl.hidden = true;
     return;
   }
@@ -527,36 +554,37 @@ async function refreshRagStats() {
   }
   const n = Number(stats.chunks) || 0;
   ragStatsEl.textContent = n > 0
-    ? 'RAG 宸茬储寮?' + n + ' 鐗囨'
+    ? 'RAG 已索引 ' + n + ' 片段'
-    : 'RAG 0 鐗囨锛堣涓婁紶鏃㈡湁绯荤粺 zip锛?;
+    : 'RAG 0 片段（请上传既有系统 zip）';
   ragStatsEl.classList.toggle('ready', n > 0);
   ragStatsEl.classList.toggle('zero', n === 0);
-  // 寮€鍏冲彲鐢ㄦ€э細蹇呴』鍏堟湁 RAG 绱㈠紩鎵嶈兘鐢?  ragEnabledEl.disabled = n === 0;
+  // 开关可用性：必须先有 RAG 索引才能用
+  ragEnabledEl.disabled = n === 0;
   if (n === 0) {
     ragEnabledEl.checked = false;
     writeRagFlag(false);
-    ragEnabledEl.parentElement.title = '璇峰厛鍦ㄤ笂浼犲尯閫夋嫨"鏃㈡湁绯荤粺 zip"骞朵笂浼?;
+    ragEnabledEl.parentElement.title = '请先在上传区选择"既有系统 zip"并上传';
   } else {
     ragEnabledEl.checked = readRagFlag();
     ragEnabledEl.parentElement.title = ragEnabledEl.checked
-      ? 'RAG 妫€绱㈢粨鏋滀細娉ㄥ叆鍒?LLM prompt'
+      ? 'RAG 检索结果会注入到 LLM prompt'
-      : '鍕鹃€夊悗鍚敤 RAG 妫€绱?;
+      : '勾选后启用 RAG 检索';
   }
   updateImpactButton();
 }
 
 function updateImpactButton() {
-  // 宸叉湁 RAG 绱㈠紩锛坮ag-stats 鍐冲畾锛?涓旀湁 sid 鎵嶈兘褰卞搷
+  // 已有 RAG 索引（rag-stats 决定） 且有 sid 才能影响
   if (!sid) { impactBtnEl.disabled = true; return; }
   const hasRag = (Number(ragStatsEl.dataset.chunks || 0) > 0) || !ragEnabledEl.disabled;
   impactBtnEl.disabled = !hasRag;
   impactBtnEl.textContent = ragEnabledEl.checked
-    ? '寮€濮嬪奖鍝嶈皟鏌ワ紙鍚敤 RAG锛?
+    ? '开始影响调查（启用 RAG）'
-    : '寮€濮嬪奖鍝嶈皟鏌?;
+    : '开始影响调查';
 }
 
 impactBtnEl.addEventListener('click', async () => {
-  if (!sid) { addMsg('error', '璇峰厛鍙戦€佷竴鏉℃秷鎭互鍒涘缓浼氳瘽'); inputEl.focus(); return; }
+  if (!sid) { addMsg('error', '请先发送一条消息以创建会话'); inputEl.focus(); return; }
   const useRag = !!ragEnabledEl.checked;
   impactBtnEl.disabled = true;
   const typing = showTyping();
@@ -566,18 +594,19 @@ impactBtnEl.addEventListener('click', async () => {
     const d = await r.json();
     if (!r.ok) throw new Error(d.detail?.message || r.status);
     typing.remove();
-    addMsg('progress', '<span class="progress-item ok">褰卞搷璋冩煡宸叉彁浜わ紙use_rag=' + (useRag ? 'true' : 'false') + '锛?/span>');
+    addMsg('progress', '<span class="progress-item ok">影响调查已提交（use_rag=' + (useRag ? 'true' : 'false') + '）</span>');
-    // 璁?WebSocket 鎶婂悗缁繘搴︽帹涓婃潵锛涚◢鍚庣敤鎴峰彲鏌?impact-result
+    // 让 WebSocket 把后续进度推上来；稍后用户可查 impact-result
-    addMsg('assistant', '褰卞搷璋冩煡宸插惎鍔ㄣ€傚畬鎴愬悗鍙湪姝や細璇濈偣鍑?棰勮"鎴栬闂?/result/impact-report 涓嬭浇鎶ュ憡銆?);
+    addMsg('assistant', '影响调查已启动。完成后可在此会话点击"预览"或访问 /result/impact-report 下载报告。');
   } catch (e) {
     typing.remove();
-    addMsg('error', '褰卞搷璋冩煡澶辫触锛? + esc(String(e)));
+    addMsg('error', '影响调查失败：' + esc(String(e)));
   } finally {
     updateImpactButton();
   }
 });
 document.addEventListener('click', (e) => {
-  // 鐐瑰嚮鍒囨崲鍣ㄥ閮ㄥ叧闂笅鎷?  if (!document.getElementById('proj-switcher').contains(e.target)) toggleProjectSwitcher(false);
+  // 点击切换器外部关闭下拉
+  if (!document.getElementById('proj-switcher').contains(e.target)) toggleProjectSwitcher(false);
 });
 document.addEventListener('keydown', (e) => {
   if (e.key === 'Escape') {
@@ -587,7 +616,8 @@ document.addEventListener('keydown', (e) => {
   }
 });
 
-// 瀹㈡埛绔被鍨?鈫?鎵╁睍鍚嶇櫧鍚嶅崟鏍￠獙锛圥0鈥態 / P1鈥慐锛夈€?const UPLOAD_EXT_RULES = {
+// 客户端类型 → 扩展名白名单校验（P0‑B / P1‑E）。
+const UPLOAD_EXT_RULES = {
   existing_system: ['.zip'],
   requirements: ['.xlsx'],
   template: ['.docx'],
@@ -598,7 +628,9 @@ function pickExt(name) {
   const i = String(name).lastIndexOf('.');
   return i >= 0 ? String(name).slice(i).toLowerCase() : '';
 }
-// 椤圭洰绾ч缃?鈫?鎻愰啋锛氬啀娆′笂浼犲皢瑕嗙洊璇ヤ細璇濈殑璇ョ被鍨嬫枃浠躲€?// 杩欓噷鐢?activeProject/draftProject 瀵瑰簲鐨勯」鐩?config锛坧rojects[]锛夊垽瀹氭槸鍚﹂缃€?function projectHasPrefixedType(ft) {
+// 项目级预置 → 提醒：再次上传将覆盖该会话的该类型文件。
+// 这里用 activeProject/draftProject 对应的项目 config（projects[]）判定是否预置。
+function projectHasPrefixedType(ft) {
   const name = activeProject || draftProject;
   if (!name) return false;
   const p = (projects || []).find(x => x.name === name);
@@ -611,76 +643,78 @@ function pickExt(name) {
 }
 
 document.getElementById('upload-btn').addEventListener('click', async () => {
-  if (!sid) { addMsg('error', '璇峰厛鍙戦€佷竴鏉℃秷鎭互鍒涘缓浼氳瘽'); inputEl.focus(); return; }
+  if (!sid) { addMsg('error', '请先发送一条消息以创建会话'); inputEl.focus(); return; }
   const sel = document.getElementById('file-type');
   const ft = GenesisState.resolveUploadType(activeProject, draftProject, sel.value);
   const file = document.getElementById('file-input').files[0];
-  if (!file) { addMsg('error', '璇烽€夋嫨鏂囦欢'); return; }
+  if (!file) { addMsg('error', '请选择文件'); return; }
-  // P0鈥態 / P1鈥慐锛氬鎴风绫诲瀷涓庢墿灞曞悕鏍￠獙
+  // P0‑B / P1‑E：客户端类型与扩展名校验
   const allowed = UPLOAD_EXT_RULES[ft];
   if (allowed) {
     const ext = pickExt(file.name);
     if (!ext || !allowed.includes(ext)) {
-      addMsg('error', '绫诲瀷涓嶅尮閰嶏細' + esc(ft) + ' 搴斾负 ' + allowed.join('/') + ' 鏂囦欢锛堝綋鍓嶏細' + esc(file.name) + '锛?);
+      addMsg('error', '类型不匹配：' + esc(ft) + ' 应为 ' + allowed.join('/') + ' 文件（当前：' + esc(file.name) + '）');
       return;
     }
   }
-  // P0鈥態锛氶」鐩凡棰勭疆鍚岀被鍨嬫椂鏄惧紡纭瑕嗙洊锛堜笉鍐嶄互"钘忚捣鍏ュ彛"鍋氶殣寮忕害鏉燂級
+  // P0‑B：项目已预置同类型时显式确认覆盖（不再以"藏起入口"做隐式约束）
   if (projectHasPrefixedType(ft)) {
-    const ok = confirm('椤圭洰宸查缃?' + ft + '銆傜户缁笂浼犲皢瑕嗙洊璇ヤ細璇濅腑鐨勬绫诲瀷鏂囦欢锛屾槸鍚︾户缁紵');
+    const ok = confirm('项目已预置 ' + ft + '。继续上传将覆盖该会话中的此类型文件，是否继续？');
     if (!ok) return;
   }
   const fd = new FormData();
   fd.append('file_type', ft);
   fd.append('file', file);
   const statusEl = document.getElementById('upload-status');
-  statusEl.textContent = '涓婁紶涓€?;
+  statusEl.textContent = '上传中…';
   try {
     const r = await fetch('/api/sessions/' + encodeURIComponent(sid) + '/files', { method: 'POST', body: fd });
     const d = await r.json();
     if (!r.ok) throw new Error(d.detail?.message || r.status);
     statusEl.textContent = '';
-    // B5 / P1鈥慒锛氫笂浼犳垚鍔熷悗鍚屾 activeProject銆佸埛鏂颁笂浼犳潯涓庝晶杈规爮鐘舵€?    const rec = await api('GET', '/api/sessions/' + encodeURIComponent(sid));
+    // B5 / P1‑F：上传成功后同步 activeProject、刷新上传条与侧边栏状态
+    const rec = await api('GET', '/api/sessions/' + encodeURIComponent(sid));
     activeProject = rec.project || null;
-    badge.textContent = '浼氳瘽: ' + (rec.name || '鏂颁細璇?);
+    badge.textContent = '会话: ' + (rec.name || '新会话');
     await refreshSessions();
-    updateUploadBar();   // P1鈥慒锛氫笂浼犳垚鍔熷悗鍚屾涓婁紶鏉★紙闃茬姸鎬佹粸鍚庯級
+    updateUploadBar();   // P1‑F：上传成功后同步上传条（防状态滞后）
-    await refreshRagStats();   // P0鈥慉锛氫笂浼?existing_system 鍚?RAG 绱㈠紩宸插缓
+    await refreshRagStats();   // P0‑A：上传 existing_system 后 RAG 索引已建
-    document.getElementById('file-input').value = '';   // 浠呮垚鍔熸椂娓呯┖
+    document.getElementById('file-input').value = '';   // 仅成功时清空
-    addMsg('user', '[涓婁紶] ' + ft + '锛? + d.file_name);
+    addMsg('user', '[上传] ' + ft + '：' + d.file_name);
-    addMsg('progress', '<span class="progress-item ok">涓婁紶瀹屾垚锛? + esc(d.file_name) + '锛? + d.size + 'B锛?/span>');
+    addMsg('progress', '<span class="progress-item ok">上传完成：' + esc(d.file_name) + '（' + d.size + 'B）</span>');
   } catch (e) {
     statusEl.textContent = '';
-    // F1锛氬け璐ヤ繚鐣?file-input 鍊硷紝灞曠ず鍚庣鏄庣粏
+    // F1：失败保留 file-input 值，展示后端明细
-    addMsg('error', '涓婁紶澶辫触锛? + esc(String(e)));
+    addMsg('error', '上传失败：' + esc(String(e)));
   }
 });
 
-// ---------- 鍚姩锛氭仮澶嶄晶杈规爮鎶樺彔鎬併€佷笂娆′細璇?----------
+// ---------- 启动：恢复侧边栏折叠态、上次会话 ----------
 (async () => {
   try {
     const collapsed = localStorage.getItem('genesis_sidebar_collapsed') === '1';
     if (collapsed) document.getElementById('sidebar').classList.add('collapsed');
-  } catch (e) { /* 蹇界暐 */ }
+  } catch (e) { /* 忽略 */ }
   await loadProjects();
   const saved = (() => { try { return localStorage.getItem('genesis_session'); } catch (e) { return null; } })();
   if (saved) {
-    // P2鈥慔锛氬惎鍔ㄦ仮澶嶅墠鏄剧ず loading 鍗犱綅锛岄伩鍏嶇┖ chat 涓€闂?    addMsg('assistant', '姝ｅ湪鎭㈠涓婃浼氳瘽鈥?);
+    // P2‑H：启动恢复前显示 loading 占位，避免空 chat 一闪
+    addMsg('assistant', '正在恢复上次会话…');
     try {
       await loadSession(saved);
-      // P2鈥?锛氭仮澶嶅悗鑻ヤ細璇濈殑椤圭洰宸茶鍒狅紝娓呮帀 localStorage 浠ュ厤涓嬫鍐嶈瘯
+      // P2‑7：恢复后若会话的项目已被删，清掉 localStorage 以免下次再试
       const rec = await api('GET', '/api/sessions/' + encodeURIComponent(saved));
       const recProj = rec && rec.project;
       if (recProj && !projects.find(p => p.name === recProj)) {
-        try { localStorage.removeItem('genesis_session'); } catch (e) { /* 蹇界暐 */ }
+        try { localStorage.removeItem('genesis_session'); } catch (e) { /* 忽略 */ }
-        // 椤舵爮鑻ユ樉绀虹殑鏄凡鍒犻」鐩紝鍒锋柊鍥為€€
+        // 顶栏若显示的是已删项目，刷新回退
         if (draftProject === recProj) {
           draftProject = (projects.length > 0) ? projects[0].name : null;
           applyProjectContext();
         }
       }
       return;
-    } catch (e) { /* 蹇界暐锛屾柊寤?*/ }
+    } catch (e) { /* 忽略，新建 */ }
   }
   newSession().catch(e => addMsg('error', esc(String(e))));
 })();