Fix migration dates, add multi-platform testing infrastructure, and organize docs

Migration Date Corrections:
- Update all migration TODO comments to use correct date: 2025-07-06
- Add proper TypeScript type declarations for $route and $router in DeepLinkErrorView
- Fix template property references to use $route instead of route

Multi-Platform Testing Infrastructure:
- Add comprehensive multi-platform testing requirements for migrations
- Update component migration template with platform testing requirements
- Establish sign-off requirements for web, desktop, and mobile platforms
- Document expected outcomes and validation procedures

Migration Testing Organization:
- Create docs/migration-testing/ folder for testing documentation
- Move TESTING_CONTACTIMPORT.md from project root to migration-testing/
- Relocate all migration-checklist-*.md files to migration-testing/
- Add comprehensive README.md with organization guidelines
- Update file references in components and TODOs
- Establish naming conventions and quality standards

Files added:
- docs/migration-testing/README.md
- docs/migration-testing/TESTING_CONTACTIMPORT.md
- docs/migration-testing/migration-checklist-ContactImportView.md
- docs/migration-testing/migration-checklist-MembersList.md

Files modified:
- src/views/ContactImportView.vue (date correction)
- src/components/MembersList.vue (date correction, reference path update)
- src/views/DeepLinkErrorView.vue (date correction, Vue router types)
- docs/migration-templates/component-migration.md (multi-platform requirements)

Files moved:
- TESTING_CONTACTIMPORT.md → docs/migration-testing/
- docs/migration-checklist-*.md → docs/migration-testing/

This establishes comprehensive testing infrastructure for all future migrations
with proper organization and multi-platform validation requirements.

docs/migration-templates/component-migration.md

@@ -213,4 +213,102 @@ try {
 
 - Mixin methods include caching for frequently accessed data
 - Database operations are queued and optimized
-- Error logging includes proper context and formatting 
+- Error logging includes proper context and formatting 
+
+## Phase 4: Testing and Validation
+
+### 4.1 Multi-Platform Testing Requirements
+
+**ALL MIGRATIONS MUST BE TESTED ON ALL SUPPORTED PLATFORMS:**
+
+#### Web Platform Testing (Required)
+- [ ] Test in Chrome/Chromium (primary browser)
+- [ ] Test in Firefox (secondary browser)
+- [ ] Test in Safari (if applicable)
+- [ ] Verify PWA functionality works correctly
+- [ ] Test responsive design on different screen sizes
+
+#### Desktop Platform Testing (Required)
+- [ ] Test Electron app functionality
+- [ ] Verify desktop-specific features work
+- [ ] Test file system access (if applicable)
+- [ ] Verify native desktop integrations
+
+#### Mobile Platform Testing (Required)
+- [ ] Test iOS app via Capacitor
+- [ ] Test Android app via Capacitor  
+- [ ] Verify mobile-specific features (camera, contacts, etc.)
+- [ ] Test deep linking functionality
+- [ ] Verify push notifications work
+
+### 4.2 Functional Testing Per Platform
+
+For each platform, test these core scenarios:
+
+#### Database Operations
+- [ ] Create/Read/Update/Delete operations work
+- [ ] Data persistence across app restarts
+- [ ] Database migration handling (if applicable)
+
+#### Logging and Error Handling
+- [ ] Errors are logged correctly to console
+- [ ] Errors are stored in database logs
+- [ ] Error messages display appropriately to users
+- [ ] Network errors are handled gracefully
+
+#### User Interface
+- [ ] All buttons and interactions work
+- [ ] Loading states display correctly
+- [ ] Error states display appropriately
+- [ ] Responsive design works on platform
+
+### 4.3 Platform-Specific Testing Notes
+
+#### Web Platform
+- Test offline/online scenarios
+- Verify IndexedDB storage works
+- Test service worker functionality
+- Check browser developer tools for errors
+
+#### Desktop Platform  
+- Test native menu integrations
+- Verify file system permissions
+- Test auto-updater functionality
+- Check Electron developer tools
+
+#### Mobile Platform
+- Test device permissions (camera, storage, etc.)
+- Verify app store compliance
+- Test background/foreground transitions
+- Check native debugging tools
+
+### 4.4 Sign-Off Requirements
+
+**MIGRATION IS NOT COMPLETE UNTIL ALL PLATFORMS ARE TESTED AND SIGNED OFF:**
+
+```markdown
+## Testing Sign-Off Checklist
+
+### Web Platform ✅/❌
+- [ ] Chrome: Tested by [Name] on [Date]
+- [ ] Firefox: Tested by [Name] on [Date]  
+- [ ] Safari: Tested by [Name] on [Date]
+- [ ] Notes: [Any platform-specific issues or observations]
+
+### Desktop Platform ✅/❌
+- [ ] Windows: Tested by [Name] on [Date]
+- [ ] macOS: Tested by [Name] on [Date]
+- [ ] Linux: Tested by [Name] on [Date]
+- [ ] Notes: [Any platform-specific issues or observations]
+
+### Mobile Platform ✅/❌
+- [ ] iOS: Tested by [Name] on [Date]
+- [ ] Android: Tested by [Name] on [Date]
+- [ ] Notes: [Any platform-specific issues or observations]
+
+### Final Sign-Off
+- [ ] All platforms tested and working
+- [ ] No regressions identified
+- [ ] Performance is acceptable
+- [ ] Migration completed by: [Name] on [Date]
+```