feat: add tray menu actions

[nj28wy]

Summary

Add tray menu actions for common drawing operations.

Changes:

Added menu items for:

• Toggle annotation
• Toggle click-through
• Clear annotations
• Show toolbar

Reused existing commands to keep behavior consistent with keyboard shortcuts.

Motivation:

Make the app easier to use with touch input or Sidecar by providing menu access to frequently used actions.
These options cover most drawing operations without requiring keyboard shortcuts.

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactoring (no functional changes)
• Documentation update
• CI/build changes

Testing

• npm test passes
• npm run lint passes
• npx vue-tsc --noEmit passes
• Manually tested on: macOS Sequoia (Apple Silicon)

Screenshots

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my code
• I have added tests that prove my fix is effective or my feature works
• New and existing unit tests pass locally