fix(seerr): align request button focus

lib/widgets/seerr_request_sheet.dart

@@ -5,6 +5,7 @@ import 'package:flutter/material.dart';
 import 'package:material_symbols_icons/symbols.dart';
 
 import '../focus/dpad_navigator.dart';
+import '../focus/focusable_button.dart';
 import '../i18n/strings.g.dart';
 import '../media/media_kind.dart';
 import '../models/seerr/seerr_details.dart';
@@ -408,11 +409,15 @@ class _SeerrRequestSheetState extends State<SeerrRequestSheet> {
                 Text(error, style: theme.textTheme.bodySmall?.copyWith(color: theme.colorScheme.error)),
               ],
               const SizedBox(height: 16),
-              FilledButton.icon(
+              FocusableButton(
                 focusNode: _requestButtonFocusNode,
+                useBackgroundFocus: true,
                 onPressed: _canSubmit ? _submit : null,
-                icon: _submitting ? const LoadingIndicatorBox() : const AppIcon(Symbols.download_rounded, fill: 1),
-                label: Text(t.seerr.request),
+                child: FilledButton.icon(
+                  onPressed: _canSubmit ? _submit : null,
+                  icon: _submitting ? const LoadingIndicatorBox() : const AppIcon(Symbols.download_rounded, fill: 1),
+                  label: Text(t.seerr.request),
+                ),
               ),
             ],
           ],

test/widgets/seerr_request_sheet_test.dart

@@ -5,6 +5,7 @@ import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:http/http.dart' as http;
 import 'package:http/testing.dart';
+import 'package:plezy/focus/focusable_button.dart';
 import 'package:plezy/i18n/strings.g.dart';
 import 'package:plezy/media/media_kind.dart';
 import 'package:plezy/models/seerr/seerr_session.dart';
@@ -159,6 +160,10 @@ void main() {
     // Nothing selected yet: submit disabled.
     final submitFinder = find.widgetWithText(FilledButton, 'Request');
     expect(tester.widget<FilledButton>(submitFinder).onPressed, isNull);
+    final focusableSubmit = tester.widget<FocusableButton>(
+      find.ancestor(of: submitFinder, matching: find.byType(FocusableButton)),
+    );
+    expect(focusableSubmit.useBackgroundFocus, isTrue);
 
     await tester.tap(find.text('Season 2'));
     await tester.pump();