feat: add Claude Code Desktop launch button

[malaporte]

Summary

• Adds a Claude-logo button to each worktree's launch buttons that opens the worktree in Claude Code inside Claude Desktop.
• Resumes the worktree's most recent Claude Code session via claude://resume?session=<id>; if there is none, creates one with claude -p --session-id <uuid> "/rename <worktree>" (local command, no model call).
• Names untitled sessions after the worktree folder, so sessions from the same repo are distinguishable in Desktop. Titles set by the user are kept.
• Falls back to open -a Claude <path> (new untitled session) when the claude CLI isn't found.

Notes

• claude://resume and Desktop reading custom-title on import are undocumented Desktop behaviour, so this may need updating if Desktop changes.
• Sessions already imported into Desktop keep their existing title; Desktop only reads the title on first import.

Test plan

• bun run typecheck
• bun run test
• Click the button on a worktree with and without existing sessions and check the session opens in Desktop with the worktree name

🤖 Generated with Claude Code

[github-actions]

🎉 This PR is included in version 2.21.0 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀