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/stores/playbackMode.ts

@@ -192,10 +192,14 @@ function createPlaybackModeStore() {
       // Use player_play_tracks - backend fetches all metadata from single ID
       const repositoryHandle = repository.getHandle();
 
+      // Pass the resume position so the backend seeks at load time. Doing the
+      // seek here (rather than a delayed playerSeek) avoids the race where the
+      // media isn't loaded yet and the seek is lost, restarting from 0.
       await commands.playerPlayTracks(repositoryHandle, {
         trackIds: [itemId],
         startIndex: 0,
         shuffle: false,
+        startPosition: positionSeconds,
         context: {
           type: "search",
           searchQuery: "",
@@ -204,16 +208,6 @@ function createPlaybackModeStore() {
 
       if (aborted) return;
 
-      // Wait briefly for media to load
-      await new Promise((resolve) => setTimeout(resolve, 500));
-
-      // Seek to position if not at the very start
-      if (positionSeconds > 0.5) {
-        await commands.playerSeek(positionSeconds);
-      }
-
-      if (aborted) return;
-
       // Let Rust handle stopping remote playback
       await commands.playbackModeTransferToLocal(itemId, positionTicks);