Refactor frontend components and enhance API integration

- Updated frontend-nuxt.mdc to specify usage of composables for API calls.
- Added new AuthCard and ConfirmModal components for improved UI consistency.
- Introduced UserAvatar component for user profile display, replacing previous Gravatar implementation.
- Implemented useFormSubmit composable for handling form submissions with loading and error states.
- Enhanced vitest.config.ts to include coverage reporting for composables and components.
- Removed deprecated useAdminApi and useAuth composables to streamline API interactions.
- Updated login and setup pages to utilize new components and composables for better user experience.

internal/app/services/map.go

@@ -77,13 +77,17 @@ func (s *MapService) GetMarkers(ctx context.Context) ([]app.FrontendMarker, erro
 		}
 		return grid.ForEach(func(k, v []byte) error {
 			marker := app.Marker{}
-			json.Unmarshal(v, &marker)
+			if err := json.Unmarshal(v, &marker); err != nil {
+				return err
+			}
 			graw := grids.Get([]byte(marker.GridID))
 			if graw == nil {
 				return nil
 			}
 			g := app.GridData{}
-			json.Unmarshal(graw, &g)
+			if err := json.Unmarshal(graw, &g); err != nil {
+				return err
+			}
 			markers = append(markers, app.FrontendMarker{
 				Image:  marker.Image,
 				Hidden: marker.Hidden,
@@ -111,7 +115,9 @@ func (s *MapService) GetMaps(ctx context.Context, showHidden bool) (map[int]*app
 				return nil
 			}
 			mi := &app.MapInfo{}
-			json.Unmarshal(v, mi)
+			if err := json.Unmarshal(v, mi); err != nil {
+				return err
+			}
 			if mi.Hidden && !showHidden {
 				return nil
 			}
@@ -165,14 +171,16 @@ func (s *MapService) GetGrid(ctx context.Context, id string) (*app.GridData, err
 // GetTile returns a tile by map ID, coordinate, and zoom level.
 func (s *MapService) GetTile(ctx context.Context, mapID int, c app.Coord, zoom int) *app.TileData {
 	var td *app.TileData
-	s.st.View(ctx, func(tx *bbolt.Tx) error {
+	if err := s.st.View(ctx, func(tx *bbolt.Tx) error {
 		raw := s.st.GetTile(tx, mapID, zoom, c.Name())
 		if raw != nil {
 			td = &app.TileData{}
-			json.Unmarshal(raw, td)
+			return json.Unmarshal(raw, td)
 		}
 		return nil
-	})
+	}); err != nil {
+		return nil
+	}
 	return td
 }
 
@@ -259,7 +267,9 @@ func (s *MapService) RebuildZooms(ctx context.Context) error {
 		}
 		b.ForEach(func(k, v []byte) error {
 			grid := app.GridData{}
-			json.Unmarshal(v, &grid)
+			if err := json.Unmarshal(v, &grid); err != nil {
+				return err
+			}
 			needProcess[zoomproc{grid.Coord.Parent(), grid.Map}] = struct{}{}
 			saveGrid[zoomproc{grid.Coord, grid.Map}] = grid.ID
 			return nil
@@ -318,7 +328,9 @@ func (s *MapService) GetAllTileCache(ctx context.Context) []TileCache {
 	s.st.View(ctx, func(tx *bbolt.Tx) error {
 		return s.st.ForEachTile(tx, func(mapK, zoomK, coordK, v []byte) error {
 			td := app.TileData{}
-			json.Unmarshal(v, &td)
+			if err := json.Unmarshal(v, &td); err != nil {
+				return err
+			}
 			cache = append(cache, TileCache{
 				M: td.MapID,
 				X: td.Coord.X,