feat: add manual update check to tray menu

[gui-drumond]

Summary

• add a Check for Updates action to the system tray menu
• open the app and show manual check progress, current status, or failure
• keep download and installation behind explicit user confirmation
• localize updater status in English, Portuguese, Spanish, and Chinese

Verification

• bun run lint
• bun run test
• bun run build
• cargo fmt --manifest-path src-tauri/Cargo.toml --check
• cargo clippy --manifest-path src-tauri/Cargo.toml --all-targets -- -D warnings
• cargo test --manifest-path src-tauri/Cargo.toml