desktop/7.0.0

feat: Add in-app file explorer

- Introduce a hidden file explorer screen, accessible via a secret tap gesture in the settings.
- Create a new `core:data:file-explorer` module to handle multiplatform file system interactions using `Okio`.
- Define `FileRepo` and `AbstractFileRepo` for navigating directories and viewing file contents.
- Implement platform-specific `FileRepo` for Android, iOS, JVM, and a no-op version for WasmJS.
- Add `FilesViewModel` to manage file explorer state and user actions.
- Integrate `accompanist-permissions` for handling storage permissions on Android.
- Refactor the `SignInScreen` to use an `AdaptiveFrame` for better layout on different screen sizes.

Dependency Updates:
- `actions/checkout` to `v5`
- `agp` to `8.13.1`
- `sqlDelight` to `2.2.1`
- `okio` to `3.16.2`
- `accompanist-permissions` to `0.36.0`