feat(figma): add Figma actions - #8572

Summary

• Add an 11-action Figma block for file metadata/content/nodes, exports, image fills, comments, versions, and published library inventories.
• Add delegated Figma OAuth, reusable-token refresh support, deployment/setup registration, the supplied icon, and fully generated documentation.
• Keep provider requests bounded and cancellable, preserve native string IDs and null node/render entries, and use standard workflow failure handling.

Type of Change

• New feature

Testing

• 48 focused Figma/OAuth behavior tests and 11 real PostgreSQL/Redis workflow cases passed; related selector/OAuth/tool coverage passed.
• Actual local application/browser validation passed for all 11 operations, credential connection, nested outputs, persisted executions, and light/dark rendering.
• Live delegated OAuth and all 11 actions passed against a disposable design file, including version pagination, comment/reply creation and cleanup, PNG download verification, and genuine token refresh.
• Populated published-library live validation is blocked by the Starter plan; populated responses are covered by fixtures. Public OAuth app approval remains a deployment follow-up.
• Root tests passed all 19 tasks (34,644 Sim tests). Affected type checks, lint, canvas/icon checks, generator drift checks, block-registry validation, all 58 audits, docs-manifest validation, and whitespace checks passed.
• Regression checks demonstrated failure before fixes. JSON/HTTP reports and redacted browser evidence are retained privately outside Git.

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)