修复禅道Bug清单中的前端问题：好友申请source校验、群解散二次验证缺失、

群解散事件未处理、错误码翻译缺失、恢复登录页误导性提示

- 好友申请首次必失败30000（P0）：AddFriendModal把手机号搜索单独标记为
  source:"phone"上报，但后端serveIMFriendRequestCreate的source校验只认
  search/qr/group，命中default分支返回"invalid friend request source"。
  改为手机号搜索也统一上报source:"search"（后端本就不区分具体搜索渠道），
  用两个全新、此前无任何关系的测试账号验证首次申请200成功
- 解散群聊需要短信二次验证但完整流程从未实现（P0）：新增
  SecurityChallengeModal通用二次验证弹层（POST /security/challenges→
  验证码→verify→action_token）+ requestActionToken()（stores/
  securityChallenge.ts，与requestConfirm同一模式），接入解散群聊和转让
  群主（后者此前也因缺X-Action-Token必然404/400）。同时发现并修复
  imDelete对无body请求不显式传空对象体，导致携带Content-Type:
  application/json但请求体真正为空时后端JSON解码失败返回400——实测确认
  两个问题都解决后DELETE返回200
- 群聊被解散但当前正查看该群的用户界面不会跳转（P1）：新增
  topics.ts的subscribeTopicGone()监听SDK自身的onDeleteTopic回调，
  ConversationView据此在当前会话被解散时弹出提示并跳转回消息列表
- P2P会话发起方标题栏显示原始topic id、对方明明在线却显示离线：确认
  为上一轮已修复的isCommType()根因问题的同一症状，本轮实测（新建从未
  聊过天的账号对）已不再复现；群内消息发送者显示原始uid的关联描述同样
  实测未复现
- 好友关系冲突（已是好友/申请正在处理中）报错英文原文透出：翻译表补充
  FRIEND_REQUEST_CONFLICT
- 深链/刷新页面时的"改为重新登录"链接此前在任何恢复登录过程中都会
  立即显示（不管是否超时），造成短暂白屏时的误导性提示：改为仅在真正
  超时后才显示该链接，与其上方的提示文案保持一致的显示条件

web/src/features/contacts/AddFriendModal.tsx

@@ -47,7 +47,7 @@ export function AddFriendModal({ onClose, onSent, initialTarget }: AddFriendModa
   // Tracks HOW `selected` was populated so the eventual sendFriendRequest can report the real
   // provenance instead of always claiming "search" -- NewFriendsView's own SOURCE_LABEL map has a
   // dedicated "扫码添加" entry for the qr case that was otherwise dead/unreachable.
-  const [selectedSource, setSelectedSource] = useState<'search' | 'phone' | 'qr'>('search');
+  const [selectedSource, setSelectedSource] = useState<'search' | 'qr'>('search');
   const [message, setMessage] = useState('');
   const [error, setError] = useState('');
   const [sent, setSent] = useState(false);
@@ -227,12 +227,19 @@ export function AddFriendModal({ onClose, onSent, initialTarget }: AddFriendModa
                         type="button"
                         disabled={!selectable}
                         onClick={() => {
-                          // `searchType` (already computed above from the query itself) is the real
-                          // signal for which channel actually found this person -- NewFriendsView's
-                          // own SOURCE_LABEL table already has a `phone` entry ("通过手机号搜索")
-                          // that this path never reached because every search result was tagged
-                          // 'search' regardless of how it was found.
-                          setSelectedSource(searchType === 'phone' ? 'phone' : 'search');
+                          // Real, live-confirmed backend validation (im_http.go's
+                          // serveIMFriendRequestCreate): the `source` field's switch only recognizes
+                          // `search`/`qr`/`group` -- there is no `phone` case, so it falls to
+                          // `default` and 400s with "invalid friend request source". A prior pass
+                          // here tried to report phone-originated searches as their own `phone`
+                          // source (for NewFriendsView's SOURCE_LABEL table to show "通过手机号搜索"),
+                          // which broke every phone-search-based friend request outright -- reproduced
+                          // live with two brand-new accounts before this fix (first-ever request,
+                          // never a retry/idempotency issue as it first looked). Phone and account
+                          // search both go through the same `search` channel from the backend's own
+                          // point of view; there is no server-side data to recover that distinction
+                          // from, so `SOURCE_LABEL`'s dead `phone` entry is removed alongside this.
+                          setSelectedSource('search');
                           setSelected(item);
                         }}
                         className="flex items-center gap-3 rounded-lg px-2 py-2 text-left disabled:opacity-70"

web/src/features/contacts/NewFriendsView.tsx

@@ -11,7 +11,12 @@ import { acceptFriendRequest, getFriendRequests, rejectFriendRequest, type Frien
 import { avatarBgClass, avatarLetter } from '@/lib/avatar';
 import { formatEventTimestamp } from '@/lib/messages/time';
 
-const SOURCE_LABEL: Record<string, string> = { search: '通过账号搜索', qr: '扫码添加', group: '通过群聊添加', phone: '通过手机号搜索' };
+// `phone` deliberately excluded -- the backend's own `source` validation (im_http.go's
+// serveIMFriendRequestCreate) only accepts `search`/`qr`/`group`; a phone-number search reports the
+// same `search` value an account-name search does, since the server has no separate channel for it
+// (see AddFriendModal.tsx's own selection handler for the live-confirmed 400 this caused when it
+// tried to report `phone` as its own source instead).
+const SOURCE_LABEL: Record<string, string> = { search: '通过账号搜索', qr: '扫码添加', group: '通过群聊添加' };
 
 /** README §5.3: both pending (拒绝/通过验证 buttons) and already-handled (灰字"已通过/已拒绝")
  *  inbound requests show together in one list -- `getFriendRequests('inbound', 'all')` matches