This commit introduces a dedicated `MeshTestApplication` class to improve the reliability and efficiency of Robolectric tests. This lightweight application class prevents heavyweight background initializations like WorkManager and DatabaseManager by default, addressing resource leaks and native SQLite issues on the JVM during test runs.

Key changes include:

*   **Test-Specific Application:** A new `MeshTestApplication` is used for Robolectric tests, providing control over the application lifecycle and preventing automatic initialization of services.
*   **Graceful Shutdown:** The main `MeshUtilApplication` now properly cancels its `CoroutineScope` and closes the `DatabaseManager` in `onTerminate()`. The `DatabaseManager` itself also has a new `close()` method to release resources and cancel its scope.
*   **Controlled Initialization:** Tests can now explicitly enable full application initialization when needed by setting a static flag (`MeshTestApplication.shouldInitialize`).
*   **Robolectric Configuration:** A `robolectric.properties` file has been added to configure Robolectric to use the new `MeshTestApplication`.

Signed-off-by: James Rich <[email protected]>