2f466e46bc
Implements device-aware theme defaults: - Mobile devices (≤768px): Default to light theme - Desktop devices (>768px): Default to auto theme - Saved preferences: Always respected regardless of device Implementation: 1. FOUC Prevention Script (templates/index.html): - Detects device type using window.innerWidth/clientWidth/screen.width - Sets initial theme before page render to prevent flash - Mobile: 'light', Desktop: 'auto' 2. Theme Initialization (static/js/color-theme.js): - Modified initColorTheme() to respect FOUC-detected theme - Saves FOUC-detected theme to localStorage for persistence - Prevents overwriting mobile detection with 'auto' default Test Coverage: - Test 1: Mobile first visit → light theme ✅ - Test 2: Desktop first visit → auto theme ✅ - Test 3: Saved preference honored → dark theme ✅ Files Modified: - templates/index.html: Added mobile detection in FOUC prevention - static/js/color-theme.js: Respect FOUC-detected theme - tests/mjs/49-mobile-light-theme-default.mjs: Comprehensive test suite Screenshots: - tests/screenshots/mobile-light-theme-default.png - tests/screenshots/desktop-auto-theme-default.png