feat: Extend file search to include filenames

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>

app/app.py

@@ -1264,7 +1264,11 @@ async def api_files_dirs(request: Request):
             if rel_path == '.':
                 continue
 
-            if q and q not in rel_path.lower():
+            if q:
+                # Search in directory path and filenames
+                path_match = q in rel_path.lower()
+                file_match = any(q in fn.lower() for fn in filenames)
+                if not path_match and not file_match:
                     continue
 
             try: