desktop/8.4.7

feat: Add settings navigation from SignIn screen and BackHandler

- A settings icon button has been added to the `SignInScreen` top app bar, allowing navigation to the settings screen.
- The `SignInViewModel` now handles `OnSettingsClick` and `OnSignInClick` actions.
- A `BackHandler` has been added to the `SettingsScreen` to handle back navigation, returning to the splash/main screen if the back stack is empty.

feat: Introduce macOS code signing

- Added macOS code signing to the desktop build process.
- Introduced a new script (`import_macos_dev_id_cert.sh`) to import the Developer ID certificate into a temporary keychain on macOS runners.
- Created `keystore.properties` for desktop and encrypted it for CI.
- Updated the `desktop.yaml` workflow to decrypt secrets and execute the certificate import script for macOS jobs.
- Added `macOS_development.p12` to `.gitignore`.

refactor: Replace Napier with Kermit for logging

- The logging library has been migrated from Napier to Kermit across the entire project.
- Napier dependencies (`io.github.aakira:napier`) have been replaced with Kermit (`co.touchlab:kermit`).
- `Napier.x(...)` calls have been updated to `Logger.x { ... }` using lambda syntax for lazy message evaluation.
- `CrashlyticsAntilog` has been replaced with `kermit-crashlytics`.
- `NapierKoinLogger` has been replaced with `kermit-koin`.
- Custom `PrintAntilog` for tests has been replaced with a Kermit `PrintLogWriter`.

chore: Update dependencies and Gradle version

- Upgraded Gradle Wrapper from `9.2.0` to `9.2.1`.
- Bumped various library versions in `libs.versions.toml`, including KSP, Room, and AndroidX libraries.
- Bumped app version to `8.4.7`.
- Enabled Gradle's type-safe project accessors in `settings.gradle.kts`.

chore: Update GitHub Actions and CI scripts

- Updated `actions/checkout` from `v5` to `v6` in all workflows.
- Added caching for Kotlin/Native to the `kmp.yml` workflow.
- Introduced a script to extract the Kotlin version for more precise cache keys.
- Renamed encrypted `keystore.properties.gpg` to `android.keystore.properties.gpg` for clarity.
- Added a `build_quick.sh` script to speed up local builds by excluding iOS-specific tasks.
- Added `desktop.keystore.properties.gpg` and `macOS_development.p12.gpg` to encryption/decryption scripts.

docs: Improve documentation and clean up README

- Moved detailed screenshots from the main `README.md` to a separate `docs/screenshoots/screenshots.md` file.
- Added a `MANUAL_BUILD_INSTALL.md` guide with detailed instructions for all platforms.
- Updated `CONTRIBUTING.md`, `ARCHITECTURE.md`, `AGENTS.md`, and module READMEs to reflect the new logging library and build process changes.