add cross-platform clipboard image pasting support (#14647)

[kishan705]

feat: add cross-platform clipboard image pasting support (#14647)

• Added @crosscopy/clipboard package for Windows/Linux clipboard support
• Refactored clipboardUtils to support Windows, macOS, and Linux
• Maintained macOS fallback using osascript for reliability
• Added comprehensive test coverage (12 new tests)
• Users can now paste screenshots with Ctrl+V on all platforms

Fixes #14647

Summary

Implements cross-platform clipboard image pasting support for Windows, macOS, and Linux. Users can now paste screenshots directly from the clipboard using Ctrl+V (or right-click) on all platforms, significantly improving workflow efficiency when working with visual content.

Details

• New Dependency: Added @crosscopy/[email protected] - a Rust-based native module providing clipboard access across all platforms
• Cross-Platform Support:
  • Windows: Uses native Windows clipboard APIs via @crosscopy/clipboard
  • Linux: Supports both X11 and Wayland display systems
  • macOS: Uses @crosscopy/clipboard with osascript fallback for maximum reliability
• Implementation:
  • Images retrieved as base64 and saved as PNG files in .gemini-clipboard/ directory
  • Automatic cleanup of files older than 1 hour
  • Graceful error handling with platform-specific fallbacks
  • Maintains backward compatibility with existing macOS implementation

Related Issues

Fixes #14647

How to Validate

Automated Testing:

npm run build
npm run test -- clipboardUtils.test.ts
npm run typecheck