init

lib/theme/accent.dart

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+import 'package:flutter/widgets.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import 'tokens.dart';
+
+/// Holds the current accent color — the "hero" of Ratune's aesthetic.
+///
+/// In the `dynamic` theme this is extracted from the playing track's album
+/// art and boosted for readability in OKLab space (Ratune `color.rs:11-64`),
+/// then interpolated toward over ~400ms. Phase 1 just exposes the default and
+/// a setter; the extraction + animation land in Phase 2 with playback.
+class AccentNotifier extends StateNotifier<Color> {
+  AccentNotifier() : super(RatuneColors.accentDefault);
+
+  /// Snap to a new accent (e.g. from album-art extraction).
+  void set(Color color) => state = color;
+
+  /// Return to the fixed default (e.g. no art / `static` theme).
+  void reset() => state = RatuneColors.accentDefault;
+}
+
+final accentProvider = StateNotifierProvider<AccentNotifier, Color>(
+  (ref) => AccentNotifier(),
+);