feat: Add settings to control play button visibility on home shelves

This commit introduces new functionality to customize the visibility of the
play button on home page shelves.

Key changes:

- Added `HomePageSettings` to `AppSettings` to store your preferences:
    - `showPlayButtonOnContinueShelves`: Controls visibility on "Continue Listening" and "Continue Series" shelves (default: true).
    - `showPlayButtonOnAllShelves`: Controls visibility on other shelves (default: false).
- Modified `BookHomeShelf` to respect these settings when rendering books.
- Created a new "Home Page Settings" page under "Appearance" in App Settings, allowing you to toggle these two options.
- Added comprehensive unit and widget tests to cover the new settings model, the conditional logic in `BookHomeShelf`, and the functionality of the new settings page.

lib/settings/models/app_settings.dart

@@ -19,12 +19,24 @@ class AppSettings with _$AppSettings {
     @Default(NotificationSettings()) NotificationSettings notificationSettings,
     @Default(ShakeDetectionSettings())
     ShakeDetectionSettings shakeDetectionSettings,
+    @Default(HomePageSettings()) HomePageSettings homePageSettings,
   }) = _AppSettings;
 
   factory AppSettings.fromJson(Map<String, dynamic> json) =>
       _$AppSettingsFromJson(json);
 }
 
+@freezed
+class HomePageSettings with _$HomePageSettings {
+  const factory HomePageSettings({
+    @Default(true) bool showPlayButtonOnContinueShelves,
+    @Default(false) bool showPlayButtonOnAllShelves,
+  }) = _HomePageSettings;
+
+  factory HomePageSettings.fromJson(Map<String, dynamic> json) =>
+      _$HomePageSettingsFromJson(json);
+}
+
 @freezed
 class ThemeSettings with _$ThemeSettings {
   const factory ThemeSettings({

lib/settings/view/app_settings_page.dart

@@ -120,6 +120,16 @@ class AppSettingsPage extends HookConsumerWidget {
                 context.pushNamed(Routes.notificationSettings.name);
               },
             ),
+            SettingsTile.navigation(
+              leading: const Icon(Icons.home_filled),
+              title: const Text('Home Page Settings'),
+              description: const Text(
+                'Customize the home page shelves',
+              ),
+              onPressed: (context) {
+                context.pushNamed(Routes.homePageSettings.name);
+              },
+            ),
           ],
         ),
 

lib/settings/view/home_page_settings_page.dart

@@ -0,0 +1,53 @@
+import 'package:flutter/material.dart';
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:settings_ui/settings_ui.dart';
+import 'package:vaani/settings/app_settings_provider.dart';
+import 'package:vaani/settings/widgets/simple_settings_page.dart';
+
+class HomePageSettingsPage extends HookConsumerWidget {
+  const HomePageSettingsPage({super.key});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final appSettings = ref.watch(appSettingsProvider);
+    final appSettingsNotifier = ref.read(appSettingsProvider.notifier);
+
+    return SimpleSettingsPage(
+      title: 'Home Page Settings',
+      child: SettingsList(
+        sections: [
+          SettingsSection(
+            tiles: [
+              SettingsTile.switchTile(
+                title: const Text('Show play button on continue shelves'),
+                initialValue: appSettings.homePageSettings.showPlayButtonOnContinueShelves,
+                onToggle: (value) {
+                  appSettingsNotifier.update(
+                    appSettings.copyWith(
+                      homePageSettings: appSettings.homePageSettings.copyWith(
+                        showPlayButtonOnContinueShelves: value,
+                      ),
+                    ),
+                  );
+                },
+              ),
+              SettingsTile.switchTile(
+                title: const Text('Show play button on all shelves'),
+                initialValue: appSettings.homePageSettings.showPlayButtonOnAllShelves,
+                onToggle: (value) {
+                  appSettingsNotifier.update(
+                    appSettings.copyWith(
+                      homePageSettings: appSettings.homePageSettings.copyWith(
+                        showPlayButtonOnAllShelves: value,
+                      ),
+                    ),
+                  );
+                },
+              ),
+            ],
+          ),
+        ],
+      ),
+    );
+  }
+}