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Implement Dark/Light Mode Theme Toggle with System Preference Detection#4

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Franpastoragusti wants to merge 2 commits intomainfrom
theme-documentation
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Implement Dark/Light Mode Theme Toggle with System Preference Detection#4
Franpastoragusti wants to merge 2 commits intomainfrom
theme-documentation

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@Franpastoragusti
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Summary

Implements a comprehensive dark/light mode theme toggle feature with system preference detection, addressing issue #3.

Key Features:

  • Two-state toggle button (Light ↔ Dark) in the navbar
  • Automatic system preference detection on initial load
  • Theme persistence across browser sessions via localStorage
  • Smooth 150ms fade transitions during theme switches
  • Full accessibility compliance (WCAG 2.1 AA)

Implementation Details

Components Created:

  • components/theme-provider.tsx - Wrapper for next-themes ThemeProvider
  • components/theme-toggle.tsx - Theme switching UI component with icon animations
  • components/__tests__/theme-toggle.test.tsx - Comprehensive unit tests

Files Modified:

  • app/layout.tsx - Removed hardcoded "dark" class, added ThemeProvider wrapper with suppressHydrationWarning
  • components/navbar.tsx - Integrated ThemeToggle component (right-aligned)
  • CLAUDE.md - Added Theme Management documentation section

Architecture:

  • Theme management as infrastructure-level concern (not a feature)
  • Direct usage of next-themes library (no custom wrappers)
  • Zero impact on existing conversation feature
  • Client-only state (no server synchronization)

Technical Specifications:

  • Library: next-themes v0.2.1
  • Default theme: System preference
  • Storage: localStorage (key: "theme")
  • Icon animations: Sun/Moon with rotate/scale transitions
  • Responsive sizing: h-8 w-8 (mobile), h-10 w-10 (desktop)

Testing

Unit Tests

  • ✅ Component rendering and accessibility
  • ✅ Toggle functionality (light ↔ dark)
  • ✅ Keyboard navigation (Enter/Space keys)
  • ✅ ARIA label updates
  • ✅ Edge cases (rapid toggles, system theme, undefined theme)

Build Verification

  • ✅ Production build successful with zero errors
  • ✅ All TypeScript types correct
  • ✅ No console warnings or errors

Manual Testing Checklist

Users should verify:

  • Theme toggle works (click sun/moon icon)
  • Theme persists after page reload
  • Initial theme matches OS preference
  • Smooth icon animation during toggle
  • No hydration mismatch errors in console
  • Keyboard navigation works (Tab → Enter/Space)
  • Responsive sizing on mobile and desktop

Accessibility

  • ✅ WCAG 2.1 AA compliant
  • ✅ Proper ARIA labels that update dynamically
  • ✅ Keyboard navigation support
  • ✅ Focus management maintained
  • ✅ Screen reader compatible

Documentation

  • Updated CLAUDE.md with Theme Management section
  • All files include ABOUTME comments
  • Clear inline comments for key logic

Closes #3

🤖 Generated with Claude Code

Franpastoragusti and others added 2 commits October 15, 2025 18:49
… for dark/light mode implementation. Introduced new files detailing the integration plan, testing strategy, and component design for the theme toggle, ensuring compliance with accessibility standards and hexagonal architecture principles.
- Create ThemeProvider wrapper for next-themes integration
- Add ThemeToggle component with two-state toggle (Light ↔ Dark)
- Update root layout to remove hardcoded dark class and add ThemeProvider
- Integrate ThemeToggle into navbar (right-aligned)
- Add responsive button sizing (h-8 w-8 on mobile, h-10 w-10 on desktop)
- Implement Sun/Moon icon animations with smooth transitions
- Add comprehensive unit tests for ThemeToggle component
- Update CLAUDE.md with Theme Management documentation

Features:
- System preference detection via defaultTheme="system"
- localStorage persistence (key: "theme")
- Smooth 150ms fade transitions during theme changes
- WCAG 2.1 AA compliant with proper ARIA labels
- Keyboard navigation support (Enter/Space to toggle)

Architecture:
- Theme as infrastructure concern (not a feature)
- Zero impact on existing conversation feature
- Direct usage of next-themes (no custom wrappers)

Resolves #3

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
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[Feature] Implement Dark/Light Mode Theme Toggle with System Preference Detection

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