gsxdsm ee8f19fc93 feat(FN-766): add three-tier responsive header with tablet compact mode ...

- Add tablet compact-header breakpoint (769px–1024px) with condensed layout
- Implement responsive Header component with mobile/tablet/desktop modes
- Add tablet-header-controls test suite (373 lines) for compact mode behavior
- Update existing Header and mobile-header-controls tests for new responsive tiers
- Refactor server routes and styles.css for three-tier responsive support
- Document responsive header architecture in README

2026-04-03 07:39:11 -07:00

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