feat(library): genre sliders, artist links, and navigation utils

- music landing: diverse per-genre album sliders (online counts /
  offline wide-probe fallback) and home-screen library shortcuts
- add ArtistLinks component and shared navigation/genreDiversity utils
- player/playback-mode refinements across Rust and frontend

src/lib/services/playerEvents.ts

@@ -8,8 +8,8 @@
  * TRACES: UR-005, UR-019, UR-023, UR-026 | DR-001, DR-028, DR-047
  */
 
-import { listen, type UnlistenFn } from "@tauri-apps/api/event";
-import { commands } from "$lib/api/bindings";
+import { type UnlistenFn } from "@tauri-apps/api/event";
+import { commands, events, type PlayerStatusEvent, type SleepTimerMode } from "$lib/api/bindings";
 import { player, playbackPosition } from "$lib/stores/player";
 import { queue, currentQueueItem } from "$lib/stores/queue";
 import { playbackMode } from "$lib/stores/playbackMode";
@@ -20,33 +20,9 @@ import { preloadUpcomingTracks } from "$lib/services/preload";
 import type { MediaItem } from "$lib/api/types";
 import { get } from "svelte/store";
 
-/**
- * Event types emitted by the player backend.
- * Must match PlayerStatusEvent in src-tauri/src/player/events.rs
- *
- * TRACES: UR-005, UR-019, UR-023, UR-026 | DR-001, DR-028, DR-047
- */
-export type PlayerStatusEvent =
-  | { type: "position_update"; position: number; duration: number }
-  | { type: "state_changed"; state: string; media_id: string | null }
-  | { type: "media_loaded"; duration: number }
-  | { type: "playback_ended" }
-  | { type: "buffering"; percent: number }
-  | { type: "error"; message: string; recoverable: boolean }
-  | { type: "volume_changed"; volume: number; muted: boolean }
-  | { type: "sleep_timer_changed"; mode: SleepTimerMode; remaining_seconds: number }
-  | { type: "show_next_episode_popup"; current_episode: MediaItem; next_episode: MediaItem; countdown_seconds: number; auto_advance: boolean }
-  | { type: "countdown_tick"; remaining_seconds: number };
-
-// Sleep timer mode type
-export type SleepTimerMode =
-  | { kind: "off" }
-  | { kind: "time"; endTime: number }
-  | { kind: "endOfTrack" }
-  | { kind: "episodes"; remaining: number };
-
-/** Event name for player status events from backend */
-const PLAYER_EVENT_NAME = "player-event";
+// PlayerStatusEvent and SleepTimerMode are generated by tauri-specta and
+// imported from $lib/api/bindings — they are the authoritative shapes emitted
+// by src-tauri/src/player/events.rs.
 
 let unlistenFn: UnlistenFn | null = null;
 let isInitialized = false;
@@ -62,12 +38,9 @@ export async function initPlayerEvents(): Promise<void> {
   }
 
   try {
-    unlistenFn = await listen<PlayerStatusEvent>(
-      PLAYER_EVENT_NAME,
-      (event) => {
-        handlePlayerEvent(event.payload);
-      }
-    );
+    unlistenFn = await events.playerStatusEvent.listen((event) => {
+      handlePlayerEvent(event.payload);
+    });
     isInitialized = true;
     console.log("Player event listener initialized");
   } catch (e) {
@@ -152,6 +125,10 @@ function handlePlayerEvent(event: PlayerStatusEvent): void {
     case "countdown_tick":
       handleCountdownTick(event.remaining_seconds);
       break;
+
+    // queue_changed is handled by the queue store's own listener
+    // ($lib/stores/queue), which is the single source of truth for
+    // shuffle/repeat/next/previous. No action needed here.
   }
 }
 
@@ -204,8 +181,6 @@ async function handleStateChanged(state: string, _mediaId: string | null): Promi
         player.setLoading(currentItem);
       }
 
-      // Update queue status on state change
-      await updateQueueStatus();
       break;
 
     case "idle":
@@ -218,31 +193,10 @@ async function handleStateChanged(state: string, _mediaId: string | null): Promi
         playbackMode.setMode("idle");
       }
 
-      // Update queue status on state change
-      await updateQueueStatus();
       break;
   }
 }
 
-/**
- * Update queue status from backend.
- * Called on state changes instead of polling.
- */
-async function updateQueueStatus(): Promise<void> {
-  try {
-    const queueStatus = await commands.playerGetQueue();
-
-    // Import appState stores dynamically to avoid circular imports
-    const { hasNext, hasPrevious, shuffle, repeat } = await import("$lib/stores/appState");
-    hasNext.set(queueStatus.hasNext);
-    hasPrevious.set(queueStatus.hasPrevious);
-    shuffle.set(queueStatus.shuffle);
-    repeat.set(queueStatus.repeat as "off" | "all" | "one");
-  } catch (e) {
-    console.error("[playerEvents] Failed to update queue status:", e);
-  }
-}
-
 /**
  * Handle media loaded event.
  */