feat: save current session before creating new session

- handleNewSession now saves all messages from current session
- Saves both user and assistant messages
- Then creates new session with timestamp name

src/views/SearchView.vue

@@ -798,6 +798,29 @@ async function handleSelectSession(s: SearchSession) {
 }
 
 async function handleNewSession() {
+  // Save current session messages before creating new one
+  if (currentSession.value && messages.value.length > 0) {
+    const lastMsg = messages.value[messages.value.length - 1]
+    // Save user messages
+    for (const msg of messages.value) {
+      if (msg.role === 'user' && msg.query) {
+        await saveMessage(currentSession.value.id, {
+          role: 'user',
+          content: msg.query,
+          mode: msg.mode || mode.value
+        })
+      } else if (msg.role === 'assistant') {
+        await saveMessage(currentSession.value.id, {
+          role: 'assistant',
+          content: msg.message || msg.answer || '',
+          mode: msg.mode || mode.value,
+          results: msg.results
+        })
+      }
+    }
+  }
+  
+  // Create new session
   const now = new Date()
   const timeStr = `${now.getFullYear()}/${(now.getMonth()+1).toString().padStart(2,'0')}/${now.getDate().toString().padStart(2,'0')} ${now.getHours().toString().padStart(2,'0')}:${now.getMinutes().toString().padStart(2,'0')}`
   const newSession = await createSession(timeStr, mode.value)