feat: add recent plays history modal

- GET /api/me/recent endpoint returning last 50 play events with track
  and artist info
- RecentPlays modal component with time-ago display
- "Recent plays" button in user dropdown menu
- Clicking a track in history starts playback

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

furumi-web-player/src/web/mod.rs

@@ -30,7 +30,8 @@ pub fn build_router(state: Arc<AppState>) -> Router {
         .route("/tracks/:slug/cover", get(api::track_cover))
         .route("/stream/:slug", get(api::stream_track))
         .route("/search", get(api::search))
-        .route("/tracks/:slug/play", post(api::record_play));
+        .route("/tracks/:slug/play", post(api::record_play))
+        .route("/me/recent", get(api::recent_plays));
 
     let api = Router::new()
         .nest("/api", library);