chore: add print stylesheet for ApiDetailPage (#173)

[ironhood]

Summary

• Adds a docs-grade @media print block at the end of src/index.css for ApiDetailPage printouts
• Introduces a .no-print utility and applies it to global nav, footer, deposit CTAs, in-page tabs, sidebar, and interactive controls
• Forces black-on-white print output, expands code samples without clipping, and appends full URLs after inline links (excluding # and javascript: hrefs)
• Adds CSS contract tests (src/print.test.ts) and a manual print-preview checklist

Motivation

Developers sometimes print ApiDetailPage as a quick API reference. The app shell, dark theme, and interactive chrome were bleeding into print output.

Test plan

• npm test -- src/print.test.ts passes
• Chrome Print Preview on /details/weather-001: no nav/tabs/sidebar/CTA; white background; readable text
• Firefox Print Preview: same checks
• Inline links (e.g. provider URL) show Link text (https://…) after anchor text
• Long code snippets wrap; no horizontal page overflow in code blocks
• Screen content unchanged when not printing

Closes #173

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