fix: keep history panel open after creating new session

- Removed showHistory.value = false from handleNewSession
- History panel now stays visible after clicking + New Session

src/views/SearchView.vue

@@ -805,7 +805,6 @@ async function handleNewSession() {
   if (newSession) {
     setCurrentSession(newSession)
     messages.value = []
-    showHistory.value = false
   }
 }