#415 feat(desktop): add Copy Path:Line to Monaco editor context menu

Summary

• Add "Copy Path:Line" action to Monaco diff editor's right-click context menu
• Add keyboard shortcut Cmd+Shift+C (Mac) / Ctrl+Shift+C (Windows/Linux)
• Copies file path with line number in format path:line or path:startLine-endLine for multi-line selections
• Works on both original and modified editor panels

Test plan

• Open a file in the diff viewer
• Right-click to see "Copy Path:Line" in context menu with keyboard shortcut shown
• Click cursor on a line, use context menu or hotkey, verify clipboard contains filepath:lineNumber
• Select multiple lines, use context menu or hotkey, verify clipboard contains filepath:startLine-endLine

🤖 Generated with Claude Code

Summary by CodeRabbit

Release Notes

• New Features

  • Added ability to copy file paths directly from diff viewer lines for both original and modified files

• Refactor

  • Enhanced stability of save command operations in the diff viewer

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