- Move create passkey button to builder.addButton() with proper ID
- Use builder.add() for dynamic passkeys list
- Move Passkeys class from header to .cpp (anonymous namespace)
- Remove extern SectionBuildMethod from header
- Have setupContent() call build() with custom build method
- Simplify header to only export Type PasskeysId() and PasskeysNoneBox()
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>