kappa b1468b48a2 Improve security, accessibility, and performance ...

- Add Content Security Policy meta tag for XSS protection
- Add width/height to image for CLS prevention
- Add aria-hidden to decorative SVG icons (7 locations)
- Refactor inline onclick to addEventListener for CSP compliance
- Add visibility-aware setInterval for ping updates
- Add keyboard navigation (Arrow keys) for tab panels

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2026-01-20 23:35:46 +09:00

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