- **Remote Config**:
    - Add `remote-config/app-announcements.properties` to manage Play Store announcement visibility, URLs, and localized copy via GitHub.
- **Data**:
    - Implement `GitHubAnnouncementPropertiesService` to fetch and parse the remote properties file.
    - Define `PlayStoreAnnouncementRemoteConfig` and `PlayStoreAnnouncementUiModel` to handle remote and UI state.
- **UI & Components**:
    - Create `PlayStoreAnnouncementDialog` using Material 3 `BasicAlertDialog` with a custom expressive design, including gradient backgrounds and smooth corner shapes.
    - Support dynamic action labels and a "link pending" state for when the store URL is not yet available.
- **Integration**:
    - Update `MainActivity` to fetch the announcement configuration on launch.
    - Add logic to display the dialog based on the remote `enabled` flag.
    - Implement `openExternalUrl` helper to handle Play Store navigation.