refactor(ui): simplify model button and optimize session index loading

- StatusBar model button: show model name instead of provider, click opens
  settings directly (scrolls to default model section), remove dropdown
- SessionIndexSection: replace N serial pluginQuery calls with single batch
  API (GET /_web/sessions/index-stats), add IntersectionObserver lazy loading
- Full-stack implementation: CLI route, Electron IPC/Worker, frontend adapters

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/cli/src/http/routes/web/session-index.ts

@@ -2,6 +2,10 @@ import type { FastifyInstance } from 'fastify'
 import { sessionIndexService, type SessionRuntimeAdapter } from '@openchatlab/node-runtime'
 
 export function registerSessionIndexRoutes(server: FastifyInstance, adapter: SessionRuntimeAdapter): void {
+  server.get('/_web/sessions/index-stats', async () => {
+    return sessionIndexService.getAllIndexStats(adapter)
+  })
+
   server.post<{
     Params: { id: string }
     Body: { gapThreshold?: number }

apps/desktop/main/ipc/chat.ts

@@ -836,6 +836,15 @@ export function registerChatHandlers(ctx: IpcContext): void {
     }
   })
 
+  ipcMain.handle('session:getAllIndexStats', async () => {
+    try {
+      return await worker.getAllIndexStats()
+    } catch (error) {
+      console.error('Failed to get all index stats:', error)
+      return []
+    }
+  })
+
   /**
    * 清空会话索引
    */

apps/desktop/main/worker/dbWorker.ts

@@ -60,6 +60,7 @@ import {
   clearSessions,
   hasSessionIndex,
   getSessionStats,
+  getAllIndexStats,
   updateSessionGapThreshold,
   getSessions,
   getSessionsByTimeRange,
@@ -228,6 +229,7 @@ const syncHandlers: Record<string, (payload: any) => any> = {
   clearSessions: (p) => clearSessions(p.sessionId),
   hasSessionIndex: (p) => hasSessionIndex(p.sessionId),
   getSessionStats: (p) => getSessionStats(p.sessionId),
+  getAllIndexStats: (p) => getAllIndexStats(p.sessionIds),
   updateSessionGapThreshold: (p) => updateSessionGapThreshold(p.sessionId, p.gapThreshold),
   getSessions: (p) => getSessions(p.sessionId),
   getSessionsByTimeRange: (p) => getSessionsByTimeRange(p.sessionId, p.startTs, p.endTs),

apps/desktop/main/worker/query/session/index.ts

@@ -27,6 +27,7 @@ export {
   clearSessions,
   hasSessionIndex,
   getSessionStats,
+  getAllIndexStats,
   updateSessionGapThreshold,
   getSessions,
   getSessionsByTimeRange,

apps/desktop/main/worker/query/session/sessionIndex.ts

@@ -82,6 +82,19 @@ export function getSessionStats(sessionId: string): SessionIndexStats {
   })
 }
 
+export interface SessionIndexStatusItem {
+  sessionId: string
+  hasIndex: boolean
+  sessionCount: number
+}
+
+export function getAllIndexStats(sessionIds: string[]): SessionIndexStatusItem[] {
+  return sessionIds.map((sessionId) => {
+    const stats = getSessionStats(sessionId)
+    return { sessionId, hasIndex: stats.hasIndex, sessionCount: stats.sessionCount }
+  })
+}
+
 export function updateSessionGapThreshold(sessionId: string, gapThreshold: number | null): void {
   withWritableAdapter(sessionId, (adapter) => coreUpdateSessionGapThreshold(adapter, gapThreshold))
 }

apps/desktop/main/worker/workerManager.ts

@@ -746,6 +746,14 @@ export async function getSessionStats(sessionId: string): Promise<SessionStats>
   return sendToWorker('getSessionStats', { sessionId })
 }
 
+export async function getAllIndexStats(): Promise<
+  Array<{ sessionId: string; hasIndex: boolean; sessionCount: number }>
+> {
+  const sessions = await getAllSessions()
+  const sessionIds = sessions.map((s: any) => s.id)
+  return sendToWorker('getAllIndexStats', { sessionIds })
+}
+
 /**
  * 更新单个聊天的会话切分阈值
  */

apps/desktop/preload/apis/utils.ts

@@ -256,6 +256,13 @@ export const sessionApi = {
     return ipcRenderer.invoke('session:getStats', sessionId)
   },
 
+  /**
+   * 批量获取所有会话的索引状态
+   */
+  getAllIndexStats: (): Promise<Array<{ sessionId: string; hasIndex: boolean; sessionCount: number }>> => {
+    return ipcRenderer.invoke('session:getAllIndexStats')
+  },
+
   /**
    * 清空会话索引
    */

apps/desktop/preload/index.d.ts

@@ -1128,6 +1128,7 @@ interface SessionApi {
   generateIncremental: (sessionId: string, gapThreshold?: number) => Promise<number>
   hasIndex: (sessionId: string) => Promise<boolean>
   getStats: (sessionId: string) => Promise<SessionStats>
+  getAllIndexStats: () => Promise<Array<{ sessionId: string; hasIndex: boolean; sessionCount: number }>>
   clear: (sessionId: string) => Promise<boolean>
   updateGapThreshold: (sessionId: string, gapThreshold: number | null) => Promise<boolean>
   getSessions: (sessionId: string) => Promise<ChatSessionItem[]>