feat(ui): add cover art support for internet radio stations (#5229)

* feat(artwork): add KindRadioArtwork and EntityRadio constant

* feat(model): add UploadedImage field and artwork methods to Radio

* feat(model): add Radio to GetEntityByID lookup chain

* feat(db): add uploaded_image column to radio table

* feat(artwork): add radio artwork reader with uploaded image fallback

* feat(api): add radio image upload/delete endpoints

* feat(ui): add radio artwork ID prefix to getCoverArtUrl

* feat(ui): add cover art display and upload to RadioEdit

* feat(ui): add cover art thumbnails to radio list

* feat(ui): prefer artwork URL in radio player helper

* refactor: remove redundant code in radio artwork

- Remove duplicate Avatar rendering in RadioList by reusing CoverArtField
- Remove redundant UpdatedAt assignment in radio image handlers (already set by repository Put)

* refactor(ui): extract shared useImageLoadingState hook

Move image loading/error/lightbox state management into a shared
useImageLoadingState hook in common/. Consolidates duplicated logic
from AlbumDetails, PlaylistDetails, RadioEdit, and artist detail views.

* feat(ui): use radio placeholder icon when no uploaded image

Remove album placeholder fallback from radio artwork reader so radios
without an uploaded image return ErrUnavailable. On the frontend, show
the internet-radio-icon.svg placeholder instead of requesting server
artwork when no image is uploaded, allowing favicon fallback in the
player.

* refactor(ui): update defaultOff fields in useSelectedFields for RadioList

Signed-off-by: Deluan <deluan@navidrome.org>

* fix: address code review feedback

- Add missing alt attribute to CardMedia in RadioEdit for accessibility
- Fix UpdateInternetRadio to preserve UploadedImage field by fetching
  existing radio before updating (prevents Subsonic API from clearing
  custom artwork)
- Add Reader() level tests to verify ErrUnavailable is returned when
  radio has no uploaded image

* refactor: add colsToUpdate to RadioRepository.Put

Use the base sqlRepository.put with column filtering instead of
hand-rolled SQL. UpdateInternetRadio now specifies only the Subsonic API
fields, preventing UploadedImage from being cleared. Image upload/delete
handlers specify only UploadedImage.

* fix: ensure UpdatedAt is included in colsToUpdate for radio Put

---------

Signed-off-by: Deluan <deluan@navidrome.org>

persistence/radio_repository.go

@@ -58,34 +58,20 @@ func (r *radioRepository) GetAll(options ...model.QueryOptions) (model.Radios, e
 	return res, err
 }
 
-func (r *radioRepository) Put(radio *model.Radio) error {
+func (r *radioRepository) Put(radio *model.Radio, colsToUpdate ...string) error {
 	if !r.isPermitted() {
 		return rest.ErrPermissionDenied
 	}
 
-	var values map[string]any
-
 	radio.UpdatedAt = time.Now()
-
 	if radio.ID == "" {
 		radio.CreatedAt = time.Now()
 		radio.ID = id.NewRandom()
-		values, _ = toSQLArgs(*radio)
-	} else {
-		values, _ = toSQLArgs(*radio)
-		update := Update(r.tableName).Where(Eq{"id": radio.ID}).SetMap(values)
-		count, err := r.executeSQL(update)
-
-		if err != nil {
-			return err
-		} else if count > 0 {
-			return nil
-		}
 	}
-
-	values["created_at"] = time.Now()
-	insert := Insert(r.tableName).SetMap(values)
-	_, err := r.executeSQL(insert)
+	if len(colsToUpdate) > 0 {
+		colsToUpdate = append(colsToUpdate, "UpdatedAt")
+	}
+	_, err := r.put(radio.ID, radio, colsToUpdate...)
 	return err
 }