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>

core/artwork/artwork.go

@@ -124,6 +124,8 @@ func (a *artwork) getArtworkReader(ctx context.Context, artID model.ArtworkID, s
 			artReader, err = newPlaylistArtworkReader(ctx, a, artID)
 		case model.KindDiscArtwork:
 			artReader, err = newDiscArtworkReader(ctx, a, artID)
+		case model.KindRadioArtwork:
+			artReader, err = newRadioArtworkReader(ctx, a, artID)
 		default:
 			return nil, ErrUnavailable
 		}

core/artwork/reader_radio.go

@@ -0,0 +1,40 @@
+package artwork
+
+import (
+	"context"
+	"io"
+	"time"
+
+	"github.com/navidrome/navidrome/model"
+)
+
+type radioArtworkReader struct {
+	cacheKey
+	a     *artwork
+	radio model.Radio
+}
+
+func newRadioArtworkReader(ctx context.Context, artwork *artwork, artID model.ArtworkID) (*radioArtworkReader, error) {
+	r, err := artwork.ds.Radio(ctx).Get(artID.ID)
+	if err != nil {
+		return nil, err
+	}
+	a := &radioArtworkReader{a: artwork, radio: *r}
+	a.cacheKey.artID = artID
+	a.cacheKey.lastUpdate = r.UpdatedAt
+	return a, nil
+}
+
+func (a *radioArtworkReader) LastUpdated() time.Time {
+	return a.lastUpdate
+}
+
+func (a *radioArtworkReader) Reader(ctx context.Context) (io.ReadCloser, string, error) {
+	return selectImageReader(ctx, a.artID,
+		a.fromRadioUploadedImage(),
+	)
+}
+
+func (a *radioArtworkReader) fromRadioUploadedImage() sourceFunc {
+	return fromLocalFile(a.radio.UploadedImagePath())
+}

core/artwork/reader_radio_test.go

@@ -0,0 +1,84 @@
+package artwork
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+
+	"github.com/navidrome/navidrome/conf"
+	"github.com/navidrome/navidrome/conf/configtest"
+	"github.com/navidrome/navidrome/model"
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("radioArtworkReader", func() {
+	var (
+		tempDir string
+		reader  *radioArtworkReader
+	)
+
+	BeforeEach(func() {
+		DeferCleanup(configtest.SetupConfig())
+		tempDir = GinkgoT().TempDir()
+		conf.Server.DataFolder = tempDir
+
+		Expect(os.MkdirAll(filepath.Join(tempDir, "artwork", "radio"), 0755)).To(Succeed())
+
+		reader = &radioArtworkReader{}
+	})
+
+	Describe("fromRadioUploadedImage", func() {
+		When("radio has an uploaded image", func() {
+			It("returns the uploaded image", func() {
+				imgPath := filepath.Join(tempDir, "artwork", "radio", "rd-1_test.jpg")
+				Expect(os.WriteFile(imgPath, []byte("uploaded radio image"), 0600)).To(Succeed())
+
+				reader.radio = model.Radio{ID: "rd-1", UploadedImage: "rd-1_test.jpg"}
+				sf := reader.fromRadioUploadedImage()
+				r, path, err := sf()
+				Expect(err).ToNot(HaveOccurred())
+				Expect(r).ToNot(BeNil())
+				Expect(path).To(Equal(imgPath))
+				r.Close()
+			})
+		})
+
+		When("radio has no uploaded image", func() {
+			It("returns nil reader (falls through)", func() {
+				reader.radio = model.Radio{ID: "rd-1"}
+				sf := reader.fromRadioUploadedImage()
+				r, path, err := sf()
+				Expect(err).ToNot(HaveOccurred())
+				Expect(r).To(BeNil())
+				Expect(path).To(BeEmpty())
+			})
+		})
+	})
+
+	Describe("Reader", func() {
+		When("radio has an uploaded image", func() {
+			It("returns the image reader", func() {
+				imgPath := filepath.Join(tempDir, "artwork", "radio", "rd-1_test.jpg")
+				Expect(os.WriteFile(imgPath, []byte("uploaded radio image"), 0600)).To(Succeed())
+
+				reader.radio = model.Radio{ID: "rd-1", UploadedImage: "rd-1_test.jpg"}
+				reader.cacheKey.artID = model.ArtworkID{Kind: model.KindRadioArtwork, ID: "rd-1"}
+				r, _, err := reader.Reader(context.Background())
+				Expect(err).ToNot(HaveOccurred())
+				Expect(r).ToNot(BeNil())
+				r.Close()
+			})
+		})
+
+		When("radio has no uploaded image", func() {
+			It("returns ErrUnavailable", func() {
+				reader.radio = model.Radio{ID: "rd-1"}
+				reader.cacheKey.artID = model.ArtworkID{Kind: model.KindRadioArtwork, ID: "rd-1"}
+				r, _, err := reader.Reader(context.Background())
+				Expect(err).To(MatchError(ErrUnavailable))
+				Expect(r).To(BeNil())
+			})
+		})
+	})
+})