feat: sort sessions by latest message time instead of creation time

Use `last_active` from SQLite (max message timestamp) for accurate
sorting, with fallback chain: last_active → ended_at → started_at.
CLI mode lacks last_active so falls back to ended_at.

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

packages/client/src/api/hermes/sessions.ts

@@ -7,6 +7,7 @@ export interface SessionSummary {
   title: string | null
   started_at: number
   ended_at: number | null
+  last_active?: number
   message_count: number
   tool_call_count: number
   input_tokens: number

packages/client/src/components/hermes/chat/ChatPanel.vue

@@ -85,8 +85,7 @@ function sortSessionsWithActiveFirst(items: Session[]): Session[] {
     const aLive = chatStore.isSessionLive(a.id)
     const bLive = chatStore.isSessionLive(b.id)
     if (aLive !== bLive) return aLive ? -1 : 1
-    if (b.createdAt !== a.createdAt) return b.createdAt - a.createdAt
-    return b.updatedAt - a.updatedAt
+    return (b.updatedAt || 0) - (a.updatedAt || 0)
   })
 }
 

packages/client/src/stores/hermes/chat.ts

@@ -151,7 +151,7 @@ function mapHermesSession(s: SessionSummary): Session {
     source: s.source || undefined,
     messages: [],
     createdAt: Math.round(s.started_at * 1000),
-    updatedAt: Math.round((s.ended_at || s.started_at) * 1000),
+    updatedAt: Math.round((s.last_active || s.ended_at || s.started_at) * 1000),
     model: s.model,
     provider: (s as any).billing_provider || '',
     messageCount: s.message_count,