Improve scan status indicator reliability on page reload

- Add debug logging to checkActiveScanStatus() for better tracing
- Update status indicator before showing overlay for faster feedback
- Add warning logs when DOM elements are not found
- Ensure idle state is explicitly set when no scan is running
- Add debug logging to AnimeService.get_scan_status()

src/server/services/anime_service.py

@@ -408,13 +408,20 @@ class AnimeService:
             - current_directory: Current directory being scanned
             - directory: Root directory being scanned
         """
-        return {
+        status = {
             "is_scanning": self._is_scanning,
             "total_items": self._scan_total_items,
             "directories_scanned": self._scan_directories_count,
             "current_directory": self._scan_current_directory,
             "directory": self._directory,
         }
+        logger.debug(
+            "Scan status requested",
+            is_scanning=self._is_scanning,
+            total_items=self._scan_total_items,
+            directories_scanned=self._scan_directories_count,
+        )
+        return status
 
     @lru_cache(maxsize=128)
     def _cached_list_missing(self) -> list[dict]: