boris/MOBILE_IMPLEMENTATION.md

Mobile Implementation Summary

Overview

Boris is now mobile-friendly! The app now works seamlessly on mobile devices with a responsive design that includes:

• Auto-collapsing sidebar that opens as an overlay drawer on small screens
• Touch-optimized UI with proper touch target sizes (44x44px minimum)
• Safe area insets for notched devices (iPhone X+, etc.)
• Focus trap and keyboard navigation in the mobile sidebar
• Mobile-optimized modals, toasts, and other UI elements

Changes Made

1. Viewport & Base Setup

File: index.html

• Updated viewport meta tag to include viewport-fit=cover for proper safe area handling

2. Media Query Hooks

File: src/hooks/useMediaQuery.ts (NEW)

• useMediaQuery(query) - Generic hook for any media query
• useIsMobile() - Detects mobile viewport (≤768px)
• useIsTablet() - Detects tablet viewport (≤1024px)
• useIsCoarsePointer() - Detects touch devices

3. Mobile CSS Styles

File: src/index.css

• Added CSS custom properties for mobile breakpoints and safe areas
• Mobile-specific three-pane layout that stacks into single column
• Overlay sidebar with backdrop and transitions
• Touch target improvements (44x44px minimum)
• Disabled hover effects on touch devices
• Mobile-optimized modals (full-screen sheet style)
• Mobile-optimized toasts (bottom position with safe area)
• Dynamic viewport height support (100dvh)
• Overscroll behavior and body scroll locking

4. Sidebar State Management

File: src/hooks/useBookmarksUI.ts

• Added isMobile state from media query
• Added isSidebarOpen state for mobile overlay
• Added toggleSidebar() function
• Auto-collapse logic based on autoCollapseSidebarOnMobile setting
• Mobile sidebar defaults to closed, desktop defaults to open

5. Three-Pane Layout Mobile Support

File: src/components/ThreePaneLayout.tsx

• Mobile hamburger button (visible only on mobile)
• Mobile backdrop for closing sidebar
• Body scroll locking when sidebar is open
• ESC key handler to close sidebar
• Focus trap in sidebar (Tab navigation stays within sidebar)
• Focus restoration when closing sidebar
• Accessibility attributes (aria-hidden, aria-expanded, etc.)

6. Sidebar Header Mobile Controls

File: src/components/SidebarHeader.tsx

• Close button (X) visible on mobile instead of collapse chevron
• Hamburger button hidden in header (shown in layout instead)

7. Bookmark List Mobile Props

File: src/components/BookmarkList.tsx

• Added isMobile prop support
• Passes mobile state to SidebarHeader

8. Main Bookmarks Component

File: src/components/Bookmarks.tsx

• Uses mobile state from useBookmarksUI
• Auto-closes sidebar when selecting bookmark on mobile
• Closes sidebar when opening settings on mobile
• Proper desktop/mobile toggle behavior

9. Icon Button Enhancement

File: src/components/IconButton.tsx

• Added optional className prop for additional styling

10. Mobile Settings

File: src/services/settingsService.ts

• Added autoCollapseSidebarOnMobile?: boolean setting (default: true)

File: src/components/Settings/StartupPreferencesSettings.tsx

• Added UI toggle for "Auto-collapse sidebar on small screens"

Accessibility Features

• Focus trap in mobile sidebar (Tab key navigation stays within drawer)
• ESC key closes mobile sidebar
• Backdrop click closes mobile sidebar
• Proper ARIA attributes (aria-hidden, aria-expanded, aria-controls)
• Touch target minimum size enforcement (44x44px)
• Focus restoration when closing sidebar

Mobile Behaviors

1. Sidebar: Slides in from left as overlay drawer with backdrop
2. Hamburger Menu: Fixed position top-left when sidebar closed
3. Selecting Content: Auto-closes sidebar on mobile
4. Opening Settings: Auto-closes sidebar on mobile
5. Highlights Panel: Hidden on mobile (content takes full width)
6. Modals: Full-screen sheet style from bottom
7. Toasts: Bottom position with safe area padding

Responsive Breakpoints

• Mobile: ≤768px (sidebar overlay, single column)
• Tablet: ≤1024px (defined but not actively used yet)
• Desktop: >768px (three-pane layout as before)

Browser Support

• Modern browsers with CSS Grid support
• iOS Safari (including safe area insets)
• Chrome for Android
• Firefox Mobile
• Safari on iPadOS

Safe Area Support

The app respects device safe areas (notches, home indicators) through CSS environment variables:

• env(safe-area-inset-top)
• env(safe-area-inset-bottom)
• env(safe-area-inset-left)
• env(safe-area-inset-right)

Future Enhancements

Potential improvements for future iterations:

• Swipe gesture to open/close sidebar
• Pull-to-refresh on mobile
• Bottom sheet for highlights panel on mobile
• Optimized font sizes for mobile reading
• Mobile-specific view mode (perhaps auto-switch to compact on mobile)
• Haptic feedback on interactions (iOS/Android)
• Share sheet integration
• Install prompt for PWA

Testing Checklist

• Sidebar opens/closes on mobile
• Hamburger button visible on mobile
• Backdrop closes sidebar
• ESC key closes sidebar
• Focus trap works in sidebar
• Selecting bookmark closes sidebar
• No horizontal scroll
• Touch targets ≥ 44px
• Modals are full-screen on mobile
• Toasts appear at bottom with safe area
• Build completes without errors
• Test on actual iOS device (iPhone)
• Test on actual Android device
• Test with keyboard navigation
• Test with screen reader
• Test landscape orientation
• Test on various screen sizes (320px, 375px, 414px, 768px)

Commit History

1. feat: update viewport meta for mobile support
2. feat: add media query hooks for responsive design
3. feat: add mobile sidebar state management to useBookmarksUI
4. feat: add mobile-responsive CSS with breakpoints and safe areas
5. feat: implement mobile overlay sidebar with focus trap and ESC handling
6. feat: add mobile auto-collapse setting
7. fix: resolve TypeScript errors for mobile implementation