Implement checkbox rendering (13×13px box with ✓ text glyph when checked), radio buttons
(circle with filled dot), label click delegation (for attribute and implicit wrapping),
disabled state enforcement (blocks clicks/focus/submission with visual overlay), button type
handling (submit/button/reset for both <button> and <input> variants), form data collection
for checked controls, and form reset. Includes code review fixes: replaced broken SolidRect
checkmark with text glyph, added disabled overlay for button/textarea, rewrote integration
tests to verify actual behavior.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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