feat: show last search query in session history

- Added last_query field to SearchSession interface
- loadSessions now fetches last user message for each session
- Session list displays: mode badge, title, last query, message count, time
- Added .hs-query CSS style for query text

src/composables/useSearchSession.ts

@@ -6,6 +6,7 @@ export interface SearchSession {
   title: string
   mode: 'keyword' | 'visual' | 'people' | 'agent'
   message_count: number
+  last_query?: string
   created_at: string
   updated_at: string
 }
@@ -78,7 +79,23 @@ export function useSearchSession() {
       })
       if (!resp.ok) throw new Error(`HTTP ${resp.status}`)
       const data = await resp.json()
-      sessions.value = data.sessions || []
+      // Enrich sessions with last query from messages
+      const sessions = data.sessions || []
+      for (const s of sessions) {
+        try {
+          const msgResp = await fetch(`${base}/api/v2/search-sessions/${s.id}/messages?limit=1`, {
+            headers: getAuthHeaders()
+          })
+          if (msgResp.ok) {
+            const msgData = await msgResp.json()
+            const lastUserMsg = msgData.messages?.find((m: any) => m.role === 'user')
+            if (lastUserMsg) {
+              s.last_query = lastUserMsg.content
+            }
+          }
+        } catch {}
+      }
+      sessions.value = sessions
     } catch (e: any) {
       error.value = e.message || 'Failed to load sessions'
     } finally {

src/views/SearchView.vue

@@ -44,7 +44,8 @@
                   <span class="hs-mode">{{ formatMode(s.mode) }}</span>
                   <div class="hs-title" @click="handleSelectSession(s)">{{ s.title }}</div>
                 </div>
-                <div class="hs-time">{{ s.message_count }} messages · {{ formatSessionTime(s.updated_at) }}</div>
+                <div v-if="s.last_query" class="hs-query">{{ s.last_query.slice(0, 30) }}{{ s.last_query.length > 30 ? '...' : '' }}</div>
+                <div class="hs-time">{{ s.message_count }} msgs · {{ formatSessionTime(s.updated_at) }}</div>
               </div>
               <button class="hs-menu-btn" @click.stop="toggleSessionMenu(s.id)">⋯</button>
               <div v-if="activeSessionMenu === s.id" class="hs-menu">
@@ -1892,6 +1893,13 @@ function openSource(src: SourceInfo) {
   overflow: hidden;
   text-overflow: ellipsis;
 }
+.hs-query {
+  font-size: 11px;
+  color: var(--text-secondary);
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
 .hs-item.pinned .hs-time { color: rgba(var(--primary-color-rgb), 0.8); }
 .hs-mode {
   font-size: 10px;