fix: startNewChat now creates new session

- Updated startNewChat to call handleNewSession if currentSession exists
- This ensures + New button also creates a new session in MarkBase

src/views/SearchView.vue

@@ -709,6 +709,10 @@ function newChat() {
 function startNewChat() {
   newChat()
   showHistory.value = false
+  // Create new session if there's a current session
+  if (currentSession.value) {
+    handleNewSession()
+  }
 }
 
 function toggleSessionMenu(id: string) {