fix: clear stale search results before async fetch to prevent mixing old and new results

youtube_tui/screens/results.py

@@ -171,6 +171,11 @@ class ResultsScreen(Screen):
 
     async def load_results(self) -> None:
         """Load search results from YouTube"""
+        # Clear stale results immediately to prevent mixing with new search
+        self.videos = []
+        self.total_pages = 1
+        self.update_table()
+
         try:
             self.videos = await self.youtube_service.search_videos(
                 self.search_term, page=self.page, per_page=self.max_per_page