feat(analytics): add optional Aptabase event tracking UI

Integrate Aptabase analytics via a Tauri plugin and add a privacy
notice flow plus a settings dialog to control whether anonymous
usage events are sent. The app now tracks key user actions while
ensuring analytics never blocks core Git operations.

- Add analytics tracking helper and Aptabase plugin wiring
- Persist analytics consent in localStorage and gate tracking
- Introduce notice and settings dialogs, plus new event calls

src-tauri/Cargo.toml

@@ -17,8 +17,10 @@ serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 tauri = { version = "2", features = [] }
 tauri-plugin-dialog = "=2.7.0"
+tauri-plugin-aptabase = "1.0"
 keyring = { version = "3", features = ["apple-native", "windows-native", "async-secret-service", "crypto-rust", "async-io"] }
 commit_ai = { path = "crates/commit_ai" }
+tokio = "1.52.3"
 
 [build-dependencies]
 tauri-build = { version = "2", features = [] }