Add figma/file-browser domain skill

[ingikim]

Field-tested mechanics for the Figma file browser: internal JSON APIs (recent_files, folder listing, PUT rename), why the /duplicate URL and context-menu clicks fail, the working Cmd+D duplication path, and SPA navigation traps.

🤖 Generated with Claude Code

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Summary by cubic

Adds a domain skill for the Figma file browser with clear steps for listing, duplicating, and renaming files. Documents internal APIs and pitfalls so scripted workflows are reliable.

• New Features
  • Internal APIs: recent files, folder listing, PUT rename.
  • Duplication: select a tile, press Cmd+D; verify via folder API.
  • Pitfalls: the /duplicate URL doesn’t work for owned files; context-menu clicks don’t fire; SPA intercepts /files URLs—use clicks or APIs.

^{Written for commit b5de05c. Summary will update on new commits.}

[browser-harness-review]

✅ Skill review passed

Reviewed 1 file(s) — no findings.

[cubic-dev-ai]

No issues found across 1 file

_{Re-trigger cubic}