fix: mobile menu styling + nextcloud search/mtime/bambu hint

app.py

@@ -1970,7 +1970,14 @@ def _parse_propfind(xml_bytes, base_url, username, current_path):
         items.append({'name': name, 'path': rel, 'is_dir': is_dir,
                       'size': size, 'mtime': mtime, 'ext': ext if not is_dir else 'dir'})
 
-    items.sort(key=lambda x: (0 if x['is_dir'] else 1, x['name'].lower()))
+    def _mtime_ts(m):
+        try:
+            from email.utils import parsedate_to_datetime
+            return parsedate_to_datetime(m).timestamp()
+        except Exception:
+            return 0
+
+    items.sort(key=lambda x: (0 if x['is_dir'] else 1, -_mtime_ts(x['mtime'])))
     return items
 
 @app.route('/api/nextcloud/browse')