Refactor code for improved readability and consistency across multiple files

- Updated formatting in `drawing_toolbar.dart` for better readability, including breaking long lines and ensuring consistent indentation.
- Enhanced the `recipient_selector_sheet.dart` by adjusting line breaks and improving the layout of text styles.
- Refactored `sar_update_sheet.dart` to improve readability, including restructuring widget layouts and ensuring consistent formatting.
- Cleaned up imports and removed unnecessary lines in `widget_test.dart`.

lib/services/mbtiles_service.dart

@@ -129,7 +129,7 @@ class MbtilesService {
       final mbtiles = MbTiles(mbtilesPath: file.path);
 
       // Get metadata from MBTiles
-      final metadata = await mbtiles.getMetadata();
+      final metadata = mbtiles.getMetadata();
 
       // Convert bounds object to string if available
       String? boundsStr;
@@ -222,7 +222,7 @@ class MbtilesService {
       final mbtiles = MbTiles(mbtilesPath: file.path);
 
       // Try to get metadata to check for compression hints
-      final metadata = await mbtiles.getMetadata();
+      final metadata = mbtiles.getMetadata();
       final format = metadata.format;
 
       // For Geofabrik files, format is 'pbf' and data is gzipped