feat: Reports, Duplicates and Suspect sources live under Collection, with their counts on its rail and a "To look at" line naming the ones waiting; notices link there (M504 #5625)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/notifications/render.go

@@ -93,7 +93,7 @@ func Render(kind Kind, payload []byte) Rendered {
 		if p.Reason != "" {
 			body = who + " flagged " + name + ": " + p.Reason
 		}
-		return Rendered{Title: "Track flagged", Body: body, Link: "/admin/quarantine"}
+		return Rendered{Title: "Track flagged", Body: body, Link: "/collection/reports"}
 	case KindScanFailed:
 		title := "Library scan failed"
 		if p.Count > 1 {
@@ -114,7 +114,7 @@ func Render(kind Kind, payload []byte) Rendered {
 		return Rendered{
 			Title: plural(p.Count, "duplicate group to review", "duplicate groups to review"),
 			Body:  "The duplicate sweep found tracks holding the same recording.",
-			Link:  "/admin/duplicates",
+			Link:  "/collection/duplicates",
 		}
 	case KindDuplicatesResolved:
 		body := "Extra copies of a song were merged into the one the album keeps."
@@ -124,13 +124,13 @@ func Render(kind Kind, payload []byte) Rendered {
 		return Rendered{
 			Title: plural(p.Count, "duplicate resolved automatically", "duplicates resolved automatically"),
 			Body:  body,
-			Link:  "/admin/duplicates?view=resolved",
+			Link:  "/collection/duplicates?view=resolved",
 		}
 	case KindPlaybackErrors:
 		return Rendered{
 			Title: plural(p.Count, "playback error reported", "playback errors reported"),
 			Body:  "A track failed to play for someone.",
-			Link:  "/admin/playback-errors",
+			Link:  "/collection/reports",
 		}
 	default:
 		return Rendered{Title: "Notification", Link: "/"}