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/player/audio_handler.dart

@@ -55,7 +55,7 @@ class MinstrelAudioHandler extends BaseAudioHandler with QueueHandler, SeekHandl
   Future<void> pause() => _player.pause();
 
   @override
-  Future<void> seek(Duration p) => _player.seek(p);
+  Future<void> seek(Duration position) => _player.seek(position);
 
   @override
   Future<void> skipToNext() => _player.seekToNext();