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/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);
+              },
+            ),
           ],
         ),