feat: group chat session lifecycle, typing recovery, mention highlighting (#186)

* feat: restore group chat system with Socket.IO and SQLite persistence

- GroupChatServer: Socket.IO server with room management, message history, typing indicators
- SQLite storage for rooms, messages, and agent configuration
- AgentClients: manages AI agent connections via socket.io-client, forwards @mentions to Hermes gateway
- REST API: room CRUD, agent management, invite codes
- Agent auto-restoration on server restart
- Tests for all REST endpoints

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* docs: add context-engine design document for group chat compression

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: handle special-character session search

* fix: keep unicode dotted session search on quoted FTS path

* feat: add context engine and group chat frontend UI

- Context engine: three-zone compression (head/tail/summary) with LLM
  summarization, incremental updates, TTL cache, and graceful degradation
- Frontend: group chat page with Socket.IO client, room sidebar, message
  list, agent/member display, create/join-by-code modals
- Integration: wire context engine into agent-clients before /v1/runs
- Refactor ChatStorage to use global DB (getDb/ensureTable) with gc_ prefix
- Add i18n keys for group chat to all 8 locales
- Add sidebar nav entry and router for group chat page

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: remove leftover main branch code from merge conflict resolution

The `isNumericQuery`, `hasUnsafeChars`, and `runLikeContentSearch` functions
no longer exist — they were replaced by HEAD's `shouldUseLiteralContentSearch`
and `runLiteralContentSearch`. This dead code block caused a TypeScript
compile error after the merge.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: install missing socket.io dep and type ack params

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: enable WebSocket proxy and fix socket.io transport for group chat

- Add ws: true to Vite proxy config so WebSocket upgrade requests
  are forwarded to the backend
- Allow both polling and websocket transports on server and client
  (polling as fallback when WebSocket upgrade fails through proxy)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: separate socket.io path from REST routes for group chat

socket.io was mounted at /api/hermes/group-chat which intercepted all
REST requests to /api/hermes/group-chat/rooms etc, returning
"Transport unknown". Changed socket.io path to /api/hermes/group-chat/ws
to avoid conflicts.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* feat: improve group chat UI, agent management, and socket.io reliability

- Redesign GroupChatPanel with Naive UI, stacked agent avatars, and popover management
- Match GroupChatInput style with single chat input, add IME composition handling
- Add agent add/remove per room with profile selection and duplicate prevention
- Use @multiavatar for SVG avatar generation with caching
- Decouple joinRoom from socket.io, use REST API for data loading
- Switch socket.io to default path with /group-chat namespace to avoid proxy conflicts
- Restore agent connections after server is listening
- Add getRoomDetail REST endpoint and duplicate agent prevention (409)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* feat: server-side @mention routing with context compression status and queue

- Move @mention detection from agent socket listeners to server-side processMentions()
- Add per-room processing lock to block mention dispatch during compression
- Queue mentions during processing, drain only the latest when ready
- Emit context_status events (compressing/replying/ready) to room via Socket.IO
- Frontend displays compression status indicator above input
- Token-based compression trigger (100k threshold) with CJK-aware estimation
- Fix compressor type errors (countTokens parameter type)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* feat: improve group chat profile handling and session sync

Refine group chat room/session behavior with per-room compression controls, sidebar updates, and better stale session cleanup so multi-profile group chat state stays consistent.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* feat: group chat improvements — session lifecycle, typing recovery, mention highlighting

- Fix cross-profile session deletion with deferred delete queue
- Move saveSessionProfile to after gateway response confirmation
- Replace all console.log with logger in group-chat modules
- Add server-side typing/context_status state tracking for room rejoin
- Fix @ mention popup position to follow cursor
- Add @ mention highlighting (blue) in chat message content
- Fix mention regex to match all occurrences after HTML tags
- Enable esbuild minify and treeShaking
- Move @multiavatar/multiavatar to devDependencies
- Add i18n keys for group chat features
- Update tests for new functionality

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* chore: bump version to 0.4.5 and move @multiavatar to devDependencies

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: Zhicheng Han <zhicheng.han@mathematik.uni-goettingen.de>

packages/client/src/i18n/locales/zh.ts

@@ -46,6 +46,7 @@ export default {
     save: '保存',
     saved: '已保存',
     saveFailed: '保存失败',
+    deleteFailed: '删除失败',
     ok: '确定',
     copied: '已复制',
     copy: '复制',
@@ -79,6 +80,7 @@ export default {
     channels: '频道',
     gateways: '网关',
     terminal: '终端',
+    groupChat: '群聊',
     files: '文件',
     groupConversation: '对话',
     groupPlatform: '平台',
@@ -537,6 +539,55 @@ export default {
     processExited: '进程已退出，代码 {code}',
   },
 
+  // 群聊
+  groupChat: {
+    title: '群聊',
+    createRoom: '创建房间',
+    joinByCode: '通过邀请码加入',
+    roomName: '房间名称',
+    roomNamePlaceholder: '输入房间名称',
+    inviteCode: '邀请码',
+    autoGenerate: '自动生成',
+    noRooms: '暂无房间',
+    selectOrCreate: '选择或创建一个房间开始聊天',
+    agents: '智能体',
+    addAgent: '添加智能体',
+    selectProfile: '选择一个配置',
+    agentAdded: '智能体已添加',
+    agentAlreadyInRoom: '该智能体已在房间中',
+    noAgents: '当前房间暂无智能体',
+    members: '成员',
+    roomCreated: '房间已创建',
+    roomDeleted: '房间已删除',
+    deleteRoomConfirm: '确定删除这个房间吗？',
+    you: '你',
+    joined: '已加入房间',
+    joinFailed: '加入房间失败',
+    inputPlaceholder: '输入消息... (Enter 发送)',
+    enterCode: '输入邀请码',
+    yourName: '你的名称',
+    yourNamePlaceholder: '输入你的群聊昵称',
+    yourDescription: '自我描述（选填）',
+    yourDescriptionPlaceholder: '介绍一下你自己...',
+    agentName: 'Agent 名称',
+    agentNamePlaceholder: '自定义名称（留空则使用 profile 名称）',
+    agentDesc: 'Agent 描述',
+    agentDescPlaceholder: '描述这个 agent 的作用...',
+    agentReplying: '正在回复...',
+    agentCompressing: '正在压缩上下文...',
+    compressionSettings: '压缩设置',
+    triggerTokens: '触发压缩 Token 数',
+    triggerTokensDesc: '消息 token 数超过此值时触发上下文压缩',
+    maxHistoryTokens: '最大历史 Token 数',
+    maxHistoryTokensDesc: '压缩后发送给 LLM 的最大 token 数',
+    tailMessageCount: '保留最近消息数',
+    tailMessageCountDesc: '压缩后保留最近的原始消息条数',
+    compressionConfig: '压缩配置',
+    compressionSaved: '压缩配置已保存',
+    compressNow: '立即压缩',
+    compressingInProgress: '正在压缩中，请稍后',
+  },
+
   // 用量统计
   usage: {
     title: '用量统计',