Enhance map functionality and API documentation

- Updated API documentation for the `rebuildZooms` endpoint to clarify its long execution time and response behavior.
- Modified MapView component to manage tile cache invalidation after rebuilding zoom levels, ensuring fresh tile display.
- Introduced a new composable for handling tile cache invalidation state after admin actions.
- Enhanced character icon creation to reflect ownership status with distinct colors.
- Improved loading state handling in various components for better user experience during data fetching.

internal/app/services/admin.go

@@ -349,6 +349,6 @@ func (s *AdminService) HideMarker(ctx context.Context, markerID string) error {
 }
 
 // RebuildZooms delegates to MapService.
-func (s *AdminService) RebuildZooms(ctx context.Context) {
-	s.mapSvc.RebuildZooms(ctx)
+func (s *AdminService) RebuildZooms(ctx context.Context) error {
+	return s.mapSvc.RebuildZooms(ctx)
 }