feat(web): 会话头像/名称可点击展开详情栏，移除"关于 MeetingIM"设置页

聊天窗口头部的头像和昵称此前只是静态展示，只有右侧"i"图标能展开
详情栏；现在点击头像或名称同样会触发 onToggleDetail，单聊群聊均
生效。

按产品决定移除设置里的"关于 MeetingIM"页面（桌面目录、移动端"我的"
二级设置列表两处入口一并去掉），该页面唯一内容是版本号和一个后端
本就不支持 platform=web 的检查更新按钮，删除后 AboutPage.tsx 和
仅被它使用的 lib/api/app.ts 一并清理为死代码。

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

web/src/features/messages/ConversationView.tsx

@@ -546,24 +546,26 @@ export function ConversationView() {
               <Link to="/messages" className="grid h-9.5 w-9.5 flex-none place-items-center text-text-heading md:hidden">
                 <Icon name="arrow_back_ios_new" />
               </Link>
-              <span
-                className={`grid h-9.5 w-9.5 flex-none place-items-center rounded-lg text-sm font-medium text-white ${avatarBgClass(topicId)}`}
-              >
-                {avatarLetter(peerName)}
-              </span>
-              <div className="flex flex-col">
-                <strong className="text-base font-semibold text-text-heading">
-                  {peerName}
-                  {isGroup ? <span className="ml-1 font-normal text-text-tertiary-2">({groupMemberCount})</span> : null}
-                </strong>
-                {isGroup ? (
-                  groupSublineParts.length ? <span className="text-xs text-text-tertiary-2">{groupSublineParts.join(' · ')}</span> : null
-                ) : (
-                  <span className={`text-xs ${contact?.online ? 'text-online' : 'text-text-tertiary-2'}`}>
-                    {contact?.online ? '在线' : '离线'}
-                  </span>
-                )}
-              </div>
+              <button type="button" onClick={onToggleDetail} className="flex items-center gap-2.5 text-left">
+                <span
+                  className={`grid h-9.5 w-9.5 flex-none place-items-center rounded-lg text-sm font-medium text-white ${avatarBgClass(topicId)}`}
+                >
+                  {avatarLetter(peerName)}
+                </span>
+                <div className="flex flex-col">
+                  <strong className="text-base font-semibold text-text-heading">
+                    {peerName}
+                    {isGroup ? <span className="ml-1 font-normal text-text-tertiary-2">({groupMemberCount})</span> : null}
+                  </strong>
+                  {isGroup ? (
+                    groupSublineParts.length ? <span className="text-xs text-text-tertiary-2">{groupSublineParts.join(' · ')}</span> : null
+                  ) : (
+                    <span className={`text-xs ${contact?.online ? 'text-online' : 'text-text-tertiary-2'}`}>
+                      {contact?.online ? '在线' : '离线'}
+                    </span>
+                  )}
+                </div>
+              </button>
             </div>
             <div className="flex items-center gap-1">
               {isGroup ? null : (

web/src/features/settings/AboutPage.tsx

@@ -1,47 +0,0 @@
-import { useMutation } from '@tanstack/react-query';
-
-import { getLatestRelease } from '@/lib/api/app';
-
-const CURRENT_VERSION = __APP_VERSION__;
-
-/**
- * README §8.7's "v0.25 · 有新版本" row. Confirmed live (2026-09-08): `platform:"web"` is REJECTED
- * outright -- `400 MALFORMED_REQUEST {"details":{"field":"platform"}}` -- the real backend only
- * accepts the doc's own example values (`ios`/`android`), no web support at all. Passing a wrong
- * platform to get SOME answer would be dishonest (it'd be checking updates for the wrong client),
- * so this shows an honest "not supported" state instead of pretending the check succeeded.
- */
-export function AboutPage() {
-  const checkMutation = useMutation({ mutationFn: () => getLatestRelease(CURRENT_VERSION) });
-
-  return (
-    <div className="mx-auto w-full max-w-[720px] px-5 py-8 md:px-10">
-      <h2 className="mb-4 text-xl font-semibold text-text-heading">关于 MeetingIM</h2>
-      <div className="rounded-xl bg-white text-sm">
-        <div className="flex items-center justify-between border-b border-border-list-item px-7 py-4">
-          <span className="text-text-body">当前版本</span>
-          <span className="text-text-tertiary-2">{CURRENT_VERSION}</span>
-        </div>
-        <button
-          type="button"
-          onClick={() => checkMutation.mutate()}
-          disabled={checkMutation.isPending}
-          className="flex w-full items-center justify-between px-7 py-4 text-left"
-        >
-          <span className="text-text-body">检查更新</span>
-          <span className="text-text-tertiary-2">
-            {checkMutation.isPending
-              ? '检查中…'
-              : checkMutation.isError
-                ? '暂不支持检查更新'
-                : checkMutation.data
-                  ? checkMutation.data.update_type === 'none'
-                    ? '已是最新版本'
-                    : `发现新版本 ${checkMutation.data.latest_version}`
-                  : '›'}
-          </span>
-        </button>
-      </div>
-    </div>
-  );
-}

web/src/features/settings/SettingsLayout.tsx

@@ -15,7 +15,6 @@ const DIRECTORY = [
   { key: 'notifications', to: '/settings/notifications', icon: 'notifications', label: '消息通知' },
   { key: 'privacy', to: '/settings/privacy', icon: 'lock', label: '隐私' },
   { key: 'general', to: '/settings/general', icon: 'tune', label: '通用' },
-  { key: 'about', to: '/settings/about', icon: 'info', label: '关于 MeetingIM' },
 ];
 
 /**
@@ -183,14 +182,14 @@ export function SettingsLayout() {
         </div>
 
         {/* Mobile "设置" sub-list (mock `07/1e`) -- a second, DIFFERENT grouping from both the hub
-            above and the desktop directory: 清空缓存/意见反馈/关于 sit here directly, not nested
-            under 通用. 清空缓存 links through to 通用 rather than duplicating that action (and its
+            above and the desktop directory: 清空缓存/意见反馈 sit here directly, not nested under
+            通用. 清空缓存 links through to 通用 rather than duplicating that action (and its
             already-established "no fake byte count" honesty) in a second place; 意见反馈 has no
             generic post-login feedback endpoint anywhere in this protocol (the only feedback API,
             `/tenant-entry-feedback`, is unauthenticated and pre-login-only per its own name) so this
-            is a real, recorded backend gap, not a missed wire-up. 关于 omits the mock's red-dot
-            "有新版本" -- already confirmed elsewhere that state can never be real (the update-check
-            endpoint always rejects `platform=web`), showing it would be lying about system state. */}
+            is a real, recorded backend gap, not a missed wire-up. 关于 MeetingIM removed entirely per
+            product decision -- its only real content was a version string and an update-check the
+            backend rejects for `platform=web`, not worth a dedicated page. */}
         <div className={`flex-1 flex-col overflow-y-auto md:hidden ${mobileSubView ? 'flex' : 'hidden'}`}>
           <div className="grid h-12 flex-none grid-cols-[44px_1fr_44px] items-center bg-white px-1">
             <button type="button" onClick={() => setMobileSubView(false)} className="grid h-9 w-9 place-items-center text-text-heading">
@@ -201,7 +200,7 @@ export function SettingsLayout() {
           </div>
           <div className="flex flex-col gap-2.5 py-2.5">
             <div className="flex flex-col bg-white">
-              {DIRECTORY.filter((item) => item.key !== 'profile' && item.key !== 'about').map((item, i, arr) => (
+              {DIRECTORY.filter((item) => item.key !== 'profile').map((item, i, arr) => (
                 <Link
                   key={item.key}
                   to={item.to}
@@ -217,14 +216,10 @@ export function SettingsLayout() {
                 <span>清空缓存</span>
                 <Icon name="chevron_right" className="text-xl text-icon-arrow" />
               </Link>
-              <button type="button" onClick={notImplemented} className="flex items-center justify-between border-b border-border-list-item px-5 py-3.5 text-left text-base text-text-body">
+              <button type="button" onClick={notImplemented} className="flex items-center justify-between px-5 py-3.5 text-left text-base text-text-body">
                 <span>意见反馈</span>
                 <Icon name="chevron_right" className="text-xl text-icon-arrow" />
               </button>
-              <Link to="/settings/about" className="flex items-center justify-between px-5 py-3.5 text-base text-text-body no-underline">
-                <span>关于 MeetingIM</span>
-                <Icon name="chevron_right" className="text-xl text-icon-arrow" />
-              </Link>
             </div>
             <button type="button" onClick={logout} disabled={loggingOut} className="bg-white py-3.5 text-center text-base text-danger-text disabled:opacity-50">
               退出登录