fix(flutter): five flutter analyze --fatal-infos issues from first CI run

1. lib/app.dart + lib/shared/routing.dart — buildRouter takes a Ref but was
   being called from a ConsumerWidget's build() with a WidgetRef. Add a
   routerProvider; the widget watches it instead of constructing the
   router from its own ref. Real bug — would have crashed compile in
   slice 1, just never compiled until CI ran.

2. lib/player/audio_handler.dart — override of AudioHandler.seek used
   `p` for the Duration; rename to `position` to match the base class
   (avoid_renaming_method_parameters lint).

3. lib/theme/theme_extension.dart — fromTokens() returned a non-const
   constructor; all inputs are const so make the call const too
   (prefer_const_constructors).

4. test/library/home_screen_test.dart — same const-constructor lint on
   the HomeData test fixture.

5. test/smoke_test.dart — drop the unused
   `import 'package:flutter/material.dart'`.

These are exactly the kind of issues the no-in-task-tests rule shifted
to CI; this is the first run that actually exercises the analyzer
against the slice 1 code.

flutter_client/lib/shared/routing.dart

@@ -12,6 +12,12 @@ import '../player/now_playing_screen.dart';
 import '../player/player_bar.dart';
 import 'widgets/version_gate.dart';
 
+/// Exposed as a Provider so its single argument is a real `Ref` (the
+/// constructor's redirect closures use `ref.read`). Widgets consume the
+/// router via `ref.watch(routerProvider)` instead of constructing it
+/// themselves with a `WidgetRef`, which can't satisfy the `Ref` type.
+final routerProvider = Provider<GoRouter>((ref) => buildRouter(ref));
+
 GoRouter buildRouter(Ref ref) {
   return GoRouter(
     initialLocation: '/',