* feat(ui): add keyboard shortcuts, perf monitor, toast system, theme toggle, and WCAG accessibility
- Keyboard shortcuts overlay (press ? for help, 1-8 for tabs, T for theme, P for perf)
- Real-time performance monitor with FPS, memory, latency sparklines (draggable)
- Enhanced toast notification system with stacking, auto-dismiss, progress bars
- Dark/light theme toggle with localStorage persistence and system preference detection
- WCAG accessibility: skip-to-content link, ARIA roles/attributes on tabs and panels,
arrow key navigation in tab bar, focus-visible outlines
- ESLint config for UI directory with security and quality rules
* feat(ui): add command palette, activity log, data export, fullscreen mode, connection status
- Command palette (Ctrl+K / Cmd+K) with fuzzy search across tabs and actions
- Activity log panel (L key) with real-time console interception, filters, resizable
- Data export utility (E key) for sensor data as JSON/CSV with dialog
- Fullscreen mode (F key / F11) for visualization tabs with exit button
- Connection status widget in header showing WebSocket state and reconnect
* feat(ui): add mobile hamburger nav, PWA support, and 40 unit tests
- Mobile hamburger navigation: slide-out drawer replacing tab bar on <768px,
swipe-to-close, animated hamburger icon, auto-sync with tab manager
- PWA manifest + service worker: installable dashboard, offline shell caching
(cache-first for static, network-first for API), auto-cleanup of old caches
- 40 unit tests for ToastManager, ThemeToggle, KeyboardShortcuts, PerfMonitor,
TabManager - browser-based test runner at ui/tests/unit-tests.html
- PWA meta tags: theme-color, apple-mobile-web-app-capable, manifest link
- Icon generator page for creating PWA icons (ui/icons/generate.html)
* feat(ui): add URL routing, onboarding tour, idle detection, notification center
- Hash router: tabs are bookmarkable/shareable via URL (#demo, #sensing, etc.),
syncs with TabManager, supports browser back/forward navigation
- Onboarding tour: interactive 6-step first-run walkthrough with spotlight
highlighting, step indicators, skip/back/next controls, localStorage persistence
- Idle detection: pauses health polling and reduces CSS animations after 3 min
of inactivity, resumes on user interaction, integrates with Page Visibility API
- Notification center: bell icon in header with unread badge, event history panel
with mark-read/clear, persists across page views via sessionStorage
* feat(ui): add i18n (EN/PL), screenshot tool, settings panel, reduced motion, uptime clock
- i18n: English/Polish translations with auto-detection, language selector
in header, data-i18n attributes on dashboard elements, localStorage persistence
- Screenshot tool (S key): captures active tab to clipboard or downloads PNG,
flash effect, canvas rendering with watermark, fallback for tainted canvases
- Quick settings panel (gear icon): reduced motion toggle, high contrast mode,
compact layout mode, health polling toggle, clear data, reset onboarding
- Uptime clock: current time + session duration in header
- prefers-reduced-motion: system-level and manual toggle, disables all
animations and transitions for vestibular accessibility
- High contrast mode: WCAG AAA compliant colors for both light and dark themes
- Compact mode: condensed layout for dense information display
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