Task 633: Fix Color Contrast and Site-Banner Accessibility

Status: DONE

Problem

1. --text-muted: #6e7681 on #0d1117 background has ~3.5:1 contrast ratio, failing WCAG AA (requires 4.5:1)
2. .verdict-reference background #6e7681 with white text has ~4.1:1 contrast, failing WCAG AA
3. Site banner <div> has no ARIA role, invisible to screen reader landmark navigation

Solution

• Changed --text-muted from #6e7681 to #848d97 (~5.0:1 contrast)
• Changed .verdict-reference background from #6e7681 to #565d65 (~6.5:1 contrast)
• Added role="note" and aria-label="サイト注意事項" to site banner div
• Added E2E test verifying banner role and aria-label

Files Modified

• ts/src/templates.ts — Color contrast fixes and banner ARIA attributes
• ts/e2e/reports.spec.ts — Added banner accessibility E2E test