fix(server,web/m7-353): post-review fixes (test compilation, AlbumRef field, bulk handler, design system)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/subsonic/stream_test.go

@@ -4,6 +4,8 @@ import (
 	"os"
 	"path/filepath"
 	"testing"
+
+	"git.fabledsword.com/bvandeusen/minstrel/internal/coverart"
 )
 
 func TestFindSidecarCover(t *testing.T) {
@@ -14,7 +16,7 @@ func TestFindSidecarCover(t *testing.T) {
 	}
 
 	// Empty dir first: no cover.
-	if got := findSidecarCover(track); got != "" {
+	if got := coverart.FindSidecar(filepath.Dir(track)); got != "" {
 		t.Errorf("no sidecar → %q, want empty", got)
 	}
 
@@ -24,14 +26,14 @@ func TestFindSidecarCover(t *testing.T) {
 	if err := os.WriteFile(folder, []byte("jpg"), 0o644); err != nil {
 		t.Fatal(err)
 	}
-	if got := findSidecarCover(track); got != folder {
+	if got := coverart.FindSidecar(filepath.Dir(track)); got != folder {
 		t.Errorf("folder.jpg fallback = %q, want %q", got, folder)
 	}
 	cover := filepath.Join(dir, "cover.jpg")
 	if err := os.WriteFile(cover, []byte("jpg"), 0o644); err != nil {
 		t.Fatal(err)
 	}
-	if got := findSidecarCover(track); got != cover {
+	if got := coverart.FindSidecar(filepath.Dir(track)); got != cover {
 		t.Errorf("cover.jpg priority = %q, want %q", got, cover)
 	}
 }