fix: suppress autoplay error on timestamp deep links (#740)

add optional autoPlay param to queue.playNow() to allow loading
a track without triggering auto-play. used for ?t= timestamp URLs
where browser policy blocks autoplay without user interaction.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.5 <[e-mail]>

frontend/src/lib/queue.svelte.ts

···
 		this.schedulePush();
 	}
 
-	playNow(track: Track) {
-		this.lastUpdateWasLocal = true;
+	playNow(track: Track, autoPlay = true) {
+		this.lastUpdateWasLocal = autoPlay;
 		const upNext = this.tracks.slice(this.currentIndex + 1);
 		this.tracks = [track, ...upNext];
 		this.originalOrder = [...this.tracks];

frontend/src/routes/track/[id]/+page.svelte

···
 		const seconds = parseInt(t, 10);
 		if (!isNaN(seconds) && seconds >= 0) {
 			pendingSeekMs = seconds * 1000;
-			// start playing the track
+			// load the track without auto-playing (browser blocks autoplay without interaction)
 			if (track.gated) {
 				void playTrack(track);
 			} else {
-				queue.playNow(track);
+				queue.playNow(track, false);
 			}
 		}
 	}