Task 636: Add Print Styles for Dark Theme

Status: DONE

Problem

No @media print styles exist. Dark background would print as black-on-black.

Solution

Added @media print CSS block: white background, black text, hidden nav/footer/controls.

Files Modified

• ts/src/templates.ts — Added @media print CSS
• ts/e2e/reports.spec.ts — Added print styles E2E test