Show scan overlay after page reload

- Add is_scanning state tracking in AnimeService
- Add get_scan_status method to AnimeService
- Add /api/anime/scan/status endpoint to check scan state
- Add checkActiveScanStatus in JS to restore overlay on reconnect
- All 1024 tests passing

src/server/services/anime_service.py

@@ -54,6 +54,8 @@ class AnimeService:
         self._scan_directories_count: int = 0
         self._scan_files_count: int = 0
         self._scan_total_items: int = 0
+        self._is_scanning: bool = False
+        self._scan_current_directory: str = ""
         # Subscribe to SeriesApp events
         # Note: Events library uses assignment (=), not += operator
         try:
@@ -219,6 +221,8 @@ class AnimeService:
                 self._scan_directories_count = 0
                 self._scan_files_count = 0
                 self._scan_total_items = args.total
+                self._is_scanning = True
+                self._scan_current_directory = ""
                 
                 asyncio.run_coroutine_threadsafe(
                     self._progress_service.start_progress(
@@ -237,6 +241,7 @@ class AnimeService:
             elif args.status == "progress":
                 # Update scan counters
                 self._scan_directories_count = args.current
+                self._scan_current_directory = args.folder or ""
                 # Estimate files found (use current as proxy since detailed
                 # file count isn't available from SerieScanner)
                 
@@ -265,6 +270,9 @@ class AnimeService:
                 if self._scan_start_time:
                     elapsed = time.time() - self._scan_start_time
                 
+                # Mark scan as complete
+                self._is_scanning = False
+                
                 asyncio.run_coroutine_threadsafe(
                     self._progress_service.complete_progress(
                         progress_id=scan_id,
@@ -282,6 +290,7 @@ class AnimeService:
                     loop
                 )
             elif args.status == "failed":
+                self._is_scanning = False
                 asyncio.run_coroutine_threadsafe(
                     self._progress_service.fail_progress(
                         progress_id=scan_id,
@@ -290,6 +299,7 @@ class AnimeService:
                     loop
                 )
             elif args.status == "cancelled":
+                self._is_scanning = False
                 asyncio.run_coroutine_threadsafe(
                     self._progress_service.fail_progress(
                         progress_id=scan_id,
@@ -385,6 +395,25 @@ class AnimeService:
                 error=str(exc)
             )
 
+    def get_scan_status(self) -> dict:
+        """Get the current scan status.
+        
+        Returns:
+            Dictionary with scan status information including:
+            - is_scanning: Whether a scan is currently in progress
+            - total_items: Total number of items to scan
+            - directories_scanned: Number of directories scanned so far
+            - current_directory: Current directory being scanned
+            - directory: Root directory being scanned
+        """
+        return {
+            "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,
+        }
+
     @lru_cache(maxsize=128)
     def _cached_list_missing(self) -> list[dict]:
         # Synchronous cached call - SeriesApp.series_list is populated