Slim song cards with an expand arrow, and lyrics

Feed and profile cards now show one slim line (small artwork, title,
artist, Open button) with the progress bar and reactions. The arrow
opens the rest: album, your other services, Share, and lyrics.

Lyrics come from LRCLIB (open source; LRCLIB_URL can point at a
self-hosted copy, or be empty to turn lyrics off). The server looks each
song up once and caches it, including misses (retried after a week).
Timed lyrics follow along with the song; otherwise the first lines show
with "All lyrics".

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

apps/api/src/env.ts

@@ -26,6 +26,11 @@ const schema = z.object({
   /** Enables "Sign in with Last.fm" (web auth). Without it, users type their username. */
   LASTFM_SHARED_SECRET: optional,
   ODESLI_API_KEY: optional,
+  /** Lyrics come from LRCLIB (open source, self-hostable). Point this at your own instance, or set it empty to turn lyrics off. */
+  LRCLIB_URL: z
+    .string()
+    .default('https://lrclib.net')
+    .transform((v) => v.replace(/\/+$/, '')),
   /** Apple Music (MusicKit): Team ID, MusicKit key ID, and the key's .p8 contents (newlines may be written as \n). */
   APPLE_TEAM_ID: optional,
   APPLE_MUSICKIT_KEY_ID: optional,