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/export.go

@@ -207,8 +207,7 @@ func (s *ExportService) Merge(ctx context.Context, zr *zip.Reader) error {
 	for _, op := range ops {
 		s.mapSvc.SaveTile(ctx, op.MapID, app.Coord{X: op.X, Y: op.Y}, 0, op.File, time.Now().UnixNano())
 	}
-	s.mapSvc.RebuildZooms(ctx)
-	return nil
+	return s.mapSvc.RebuildZooms(ctx)
 }
 
 func (s *ExportService) processMergeJSON(