[buttercode101]

Product UI redesign

• Unify the homepage, live demo, proof explorer, and generated local dashboard around one calm light/sage design system.
• Replace overused monospaced typography with a readable product typography hierarchy.
• Improve spacing, surfaces, navigation, responsive layout, focus states, and reduced-motion support.
• Keep the demo filters, proof verification script, dashboard acknowledgement, date filtering, and copy-summary interactions intact.
• Add skip navigation and main landmarks to the demo, proof explorer, and generated dashboard.
• Preserve narrow-screen job cadence by using contained table scrolling rather than hiding the field.

Regression coverage

• Add public-page design/accessibility contract tests.
• Render a dashboard from an empty-source fixture and assert shared UI tokens, keyboard landmarks, and existing controls remain present.

Verification

• Full CI must pass before merge. This PR changes presentation and accessibility structure only; no data model, proof digest, or Habitat verification logic changes.

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