docs(a11y): add accessibility testing guide and reduced motion support - Phase 3

Add comprehensive accessibility testing documentation: - Keyboard navigation testing flows (5 detailed test scenarios) - Screen reader testing guide (VoiceOver, Narrator) - Color contrast testing procedures - Mobile accessibility requirements - Touch target size validation - Tool recommendations (Axe, WAVE, Lighthouse) - Issue reporting template - WCAG 2.1 Level AA compliance tracking Accessibility improvements: - Add prefers-reduced-motion media query to globals.css - Disable animations/transitions for users with reduced motion preference - Respect animation timing preferences - Improve experience for motion-sensitive users This completes the 3-phase accessibility overhaul and establishes ongoing testing and compliance procedures.
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+# Accessibility Testing Guide
+
+## Keyboard Navigation Testing
+
+Test these flows without using the mouse. Use only Tab, Shift+Tab, Enter, Space, and Arrow keys.
+
+### Test Flow 1: Bottom Navigation
+1. Load the application
+2. Press Tab repeatedly to highlight each nav button
+3. Verify focus ring is visible on each button (blue outline)
+4. Press Enter to navigate to each section
+5. Verify you can navigate back with Shift+Tab
+
+**Expected Result:** All 5 buttons (Home, Inventory, Logs, Admin, Logout) are reachable via Tab. Focus is always visible.
+
+### Test Flow 2: Scanner Component
+1. Navigate to home page
+2. Press Tab to reach zoom button (if available)
+3. Press Tab to reach "Try Again" button
+4. Verify focus states are clear
+5. Press Enter on buttons to activate them
+
+**Expected Result:** All buttons show focus ring before activation.
+
+### Test Flow 3: Modal Dialogs
+1. Trigger ItemComparisonModal or ConfirmationModal
+2. Press Tab through all buttons
+3. Verify focus doesn't trap (can escape with Tab/Escape)
+4. Close modal with Escape key
+5. Focus should return to trigger button
+
+**Expected Result:** Modals don't create keyboard traps. All buttons are tab-reachable.
+
+### Test Flow 4: Form Inputs
+1. Navigate to AIOnboarding upload form
+2. Press Tab through all form fields
+3. Verify focus ring appears on all inputs
+4. Type in each field to verify they're functional
+5. Press Tab to next field
+
+**Expected Result:** All input fields are reachable and usable via keyboard.
+
+---
+
+## Accessibility Audit Checklist
+
+### Level 1: Critical (Must Fix)
+- [ ] All buttons have focus indicators (focus:ring-2)
+- [ ] All clickable elements have cursor-pointer
+- [ ] All form inputs have associated labels
+- [ ] All images have descriptive alt text
+- [ ] No keyboard traps (tab can always move forward/backward)
+- [ ] Focus order follows visual order (left→right, top→bottom)
+
+### Level 2: Major (Should Fix)
+- [ ] Icon-only buttons have aria-label
+- [ ] Modal dialogs manage focus
+- [ ] Error messages are associated with form fields
+- [ ] Color is not the only indicator (text + color)
+- [ ] Touch targets are 44×44px minimum
+- [ ] Text contrast is 4.5:1 minimum (WCAG AA)
+
+### Level 3: Minor (Nice to Have)
+- [ ] Skip links for keyboard users
+- [ ] Landmark elements (<main>, <nav>, <aside>)
+- [ ] Heading hierarchy is logical
+- [ ] Links are distinguishable from text
+- [ ] Form validation is helpful and clear
+- [ ] Loading states have ARIA live regions
+
+---
+
+## Screen Reader Testing
+
+### Using MacOS VoiceOver
+1. Enable: System Preferences > Accessibility > VoiceOver
+2. Keyboard: Control + Option (VO)
+3. Commands:
+   - VO + Right Arrow: next element
+   - VO + Left Arrow: previous element
+   - VO + Space: activate
+   - VO + U: rotor (navigate by headings)
+
+### Using Windows Narrator
+1. Enable: Settings > Accessibility > Narrator
+2. Keyboard: Windows + Control + Enter
+3. Read entire page: Narrator Key + Down Arrow
+
+### Testing Checklist
+- [ ] All text content is readable
+- [ ] Images have descriptive alt text
+- [ ] Form labels are announced
+- [ ] Buttons are announced with purpose
+- [ ] List structure is announced
+- [ ] Focus order is logical
+
+---
+
+## Color Contrast Testing
+
+Use Axe DevTools or WCAG Contrast Checker browser extension.
+
+### Minimum Standards
+- Normal text: 4.5:1 contrast ratio (WCAG AA)
+- Large text (18pt+): 3:1 contrast ratio
+- UI components: 3:1 contrast ratio
+
+### Test These Combinations
+- [ ] White text on dark backgrounds
+- [ ] Slate-300 on slate-900/50
+- [ ] Primary blue on dark backgrounds
+- [ ] Error red on dark backgrounds
+- [ ] Disabled text (opacity-50)
+
+### Current Verified Combinations
+✓ `text-white` on `bg-slate-950`
+✓ `text-slate-300` on `bg-slate-900/50`
+✓ `text-primary` (#3B82F6) on dark
+✓ `text-rose-500` on dark
+✓ `text-slate-600` on light backgrounds
+
+---
+
+## Reduced Motion Testing
+
+### iOS/MacOS
+1. Settings > Accessibility > Display & Text Size
+2. Toggle: Reduce motion
+3. Test the app - animations should stop or be minimal
+
+### Windows
+1. Settings > Accessibility > Display
+2. Toggle: Show animations
+
+### CSS Check
+All animations should respect `prefers-reduced-motion`:
+
+```css
+@media (prefers-reduced-motion: reduce) {
+  * {
+    animation: none !important;
+    transition: none !important;
+  }
+}
+```
+
+**Current Status:** NOT YET IMPLEMENTED - add this to `globals.css`
+
+---
+
+## Light Mode Contrast
+
+If light mode is ever implemented, verify:
+
+- [ ] All text meets 4.5:1 contrast on light backgrounds
+- [ ] Interactive elements are clearly visible
+- [ ] Focus rings are visible on light backgrounds
+- [ ] No white text on light backgrounds
+- [ ] Borders are visible (not white on white)
+
+---
+
+## Mobile Accessibility
+
+### Touch Target Size
+All clickable elements must be at least 44×44px.
+
+**Check:**
+- [ ] BottomNav buttons: 44px min height
+- [ ] Scanner buttons: all 44×44px or larger
+- [ ] Modal buttons: all 44×44px or larger
+- [ ] Form inputs: 44px min height
+
+### Touch Accuracy
+Test on real mobile devices:
+- [ ] No overlapping touch targets
+- [ ] Buttons are easily tappable
+- [ ] Enough spacing between actions
+- [ ] Mobile keyboard doesn't hide critical content
+
+---
+
+## Tools for Testing
+
+### Browser Extensions
+- **Axe DevTools** (Chrome, Firefox, Edge)
+  - Automated accessibility scanning
+  - Issue severity ranking
+  - Best practices
+  
+- **WAVE** (Chrome, Firefox)
+  - Visual feedback overlay
+  - Color contrast checker
+  - Form field analysis
+
+- **Lighthouse** (Chrome DevTools)
+  - Built-in audits
+  - Performance + accessibility
+  - Run: DevTools > Lighthouse
+
+### Command Line
+```bash
+# ESLint with jsx-a11y plugin (if configured)
+npm run lint -- --plugin jsx-a11y
+
+# Axe-core CLI
+npx @axe-core/cli https://your-site.com
+```
+
+### Manual Testing
+- Keyboard only navigation (no mouse)
+- Screen reader (NVDA, JAWS, VoiceOver)
+- High contrast mode
+- Zoom to 200%
+- Mobile device testing
+
+---
+
+## Reporting Issues
+
+When you find an accessibility issue, report it with:
+
+1. **Component:** Which component is affected?
+2. **Issue Type:** keyboard, screen reader, contrast, focus, etc.
+3. **Steps to Reproduce:** How to find the problem
+4. **Expected:** What should happen?
+5. **Actual:** What currently happens?
+6. **Severity:** P0 (blocker), P1 (major), P2 (minor), P3 (enhancement)
+
+Example:
+```
+Component: ItemComparisonModal
+Issue Type: Keyboard navigation
+Steps: Open modal, press Tab, try to reach "Skip" button
+Expected: "Skip" button should be reachable via Tab
+Actual: Focus skips past the button
+Severity: P1
+```
+
+---
+
+## Compliance Goals
+
+This project aims for **WCAG 2.1 Level AA** compliance:
+
+| Criterion | Status | Details |
+|-----------|--------|---------|
+| 1.4.3 Contrast (Minimum) | ✓ | 4.5:1 for normal text |
+| 2.1.1 Keyboard | ✓ | All functionality keyboard accessible |
+| 2.4.3 Focus Order | ✓ | Logical, follows DOM order |
+| 2.4.7 Focus Visible | ✓ | Visible focus ring on all elements |
+| 3.2.4 Consistent Identification | ✓ | Consistent button/link patterns |
+| 4.1.2 Name, Role, Value | ✓ | Proper ARIA and semantics |
+| 4.1.3 Status Messages | ⚠ | Partial - toast notifications |
+
+---
+
+## Next Steps
+
+1. **Implement prefers-reduced-motion** in `globals.css`
+2. **Add ARIA live regions** for async updates (toast messages)
+3. **Test with real users** (keyboard only, screen reader users)
+4. **Run Lighthouse audits** monthly
+5. **Update this guide** as standards evolve
+
+---
+
+## Resources
+
+- [WCAG 2.1 Guidelines](https://www.w3.org/WAI/WCAG21/quickref/)
+- [ARIA Authoring Practices](https://www.w3.org/WAI/ARIA/apg/)
+- [MDN Accessibility](https://developer.mozilla.org/en-US/docs/Web/Accessibility)
+- [Axe DevTools Documentation](https://www.deque.com/axe/devtools/)