Add shadcn theme add-on

[ernestkoe]

Summary

• New separate FileMaker theme add-on ("shadcn by Proof+Geist") with a neutral, monochromatic aesthetic inspired by shadcn/ui
• Full color palette swap: all blue accents replaced with dark grays, borders unified, text hierarchy collapsed to 2 levels
• Element refinements: full-border inputs with rounded corners, dark-filled checkbox/radio when checked, minimal shadows, increased padding
• Includes Python transformation tools (tools/) and build-shadcn.sh for reproducible builds
• Original Mizu theme is untouched

Test plan

• Install proof_shadcn_theme.fmaddon in FileMaker
• Create test file with add-on, verify all 13 layouts
• Confirm no blue colors remain anywhere
• Check button states (hover, press, focus) on all variants
• Verify checkbox/radio dark fill when checked
• Verify input fields have full border with rounded corners

🤖 Generated with Claude Code

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/mizu-shadcn

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