feat: notify users when a downloaded update is ready to install

[lonewolfyx]

Add AppUpdateNotificationService that posts a macOS user notification once Sparkle has downloaded an update scheduled to install on quit. Tapping the notification activates the app and opens the Sparkle update window.

• AppDelegate conforms to SPUUpdaterDelegate and triggers the notification from updater(_:willInstallUpdateOnQuit:immediateInstallationBlock:).
• On launch, clear any delivered/pending notification whose build version matches the running build, so stale notices don't linger after install.
• Track the last notified build version in UserDefaults and guard concurrent attempts with a lock to avoid duplicate notifications.
• Add localized title and message strings for zh-Hans and en.

Co-Authored-By: Claude noreply@anthropic.com

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⚙️ Run configuration

Configuration used: defaults

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Run ID: f6e4d80e-5d88-4535-a4a0-cde1e97376ad

📥 Commits

Reviewing files that changed from the base of the PR and between 107738d and 6869697.

📒 Files selected for processing (3)

• Sources/AgentBar/App/AppDelegate.swift
• Sources/AgentBar/Localization/I18n.swift
• Sources/AgentBar/Services/AppUpdateNotificationService.swift

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/app-update-notification

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