fix: ensure currentSession is set before saving messages

- Added check to set currentSession from sessionList if null
- This ensures messages are always saved to a session

src/views/SearchView.vue

@@ -1250,6 +1250,10 @@ async function sendMessage() {
     if (searchSeq === seq) {
       scrollToBottom()
       try {
+        // Ensure we have a current session
+        if (!currentSession.value && sessionList.value.length) {
+          setCurrentSession(sessionList.value[0])
+        }
         // Save to session if there's a current session
         if (currentSession.value) {
           // Save user message