Implement Dark/Light Theme Toggle with Persistence and Accessibility #38

Copilot · 2025-09-30T07:15:23Z

This PR implements a fully functional dark/light theme switcher that resolves the disabled theme toggle button and adds complete theming support to the CodeStorm Hub website.

Problem

The theme toggle button in the header was previously disabled and non-functional, lacking the necessary infrastructure for theme management, persistence, and accessibility compliance.

Solution

Implemented a comprehensive theme system using React Context API with the following key components:

Theme Context Provider (`src/lib/theme-context.tsx`)

Created a centralized theme management system using React Context
Handles theme state, localStorage persistence, and DOM class manipulation
Provides toggleTheme, setTheme, and mounted state for proper hydration

Enhanced CSS Variables (`src/app/globals.css`)

Replaced media query-based dark mode with class-based theming (.dark)
Extended CSS custom properties for complete theme coverage
Added enhanced shadows and improved color contrast for accessibility
Uses Radix Colors semantic scale for consistent design

Layout Integration (`src/app/layout.tsx`)

Wrapped the entire application with ThemeProvider for global theme access
Ensures theme context is available throughout the component tree

Hook Simplification (`src/hooks/use-theme.ts`)

Refactored existing hook to use the new theme context
Maintains backward compatibility with existing API
Cleaner separation of concerns

Features

🎨 Visual Themes: Complete light and dark themes with proper contrast ratios
💾 Persistence: Theme preference saved in localStorage and restored on page load
♿ Accessibility: Full keyboard navigation support (Tab + Enter) with proper ARIA labels
⚡ Performance: Optimized hydration handling prevents SSR/client mismatches
🎯 User Experience: Smooth theme transitions with immediate visual feedback

Screenshots

Light Theme

Dark Theme

Technical Details

The implementation follows React best practices and Next.js patterns:

Client-side rendering for browser API access (localStorage, matchMedia)
Proper hydration handling with mounted state to prevent flash of unstyled content
CSS custom properties enable instant theme switching without re-renders
Minimal code changes ensure compatibility with existing components

Testing

✅ Theme toggle functionality (mouse and keyboard interaction)
✅ Theme persistence across browser sessions and page refreshes
✅ Keyboard accessibility compliance (WCAG 2.1 AA)
✅ Visual completeness and contrast ratios for both themes
✅ No console errors or hydration warnings

The theme toggle button is now fully enabled and provides a polished dark/light mode experience for all users.

Original prompt

This section details on the original issue you should resolve

<issue_title>Implement Dark/Light Theme Toggle (Enable Theme Switcher)</issue_title>
<issue_description>## Summary
The theme toggle button is currently disabled and lacks functionality. Implement a fully functional dark/light mode switcher using Radix Colors and CSS custom properties, with theme persistence and accessibility compliance.

Requirements

Implement theme context provider

Add theme switcher component using Radix Colors

Use CSS custom properties for theming

Persist user preference (local storage)

Apply theme globally across all components

Ensure toggle is keyboard accessible

Acceptance Criteria

Toggle button is enabled and accessible

Theme persists across sessions

Dark and light themes both visually complete

All UI components respond to theme changes

Priority: Critical
Deadline: October 7, 2025

References

comprehensive-audit-report.md

technical-issues-summary.md</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #30

💬 Share your feedback on Copilot coding agent for the chance to win a $200 gift card! Click here to start the survey.

…nd accessibility Co-authored-by: rezwana-karim <126201034+rezwana-karim@users.noreply.github.com>

Copilot

Pull Request Overview

This PR implements a comprehensive dark/light theme toggle system for the CodeStorm Hub website, replacing a previously disabled theme button with a fully functional theming solution. The implementation uses React Context API for state management, localStorage for persistence, and CSS custom properties for styling.

Key changes:

Created a centralized theme management system with React Context
Refactored existing theme hook to use the new context provider
Updated CSS to use class-based theming instead of media queries

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
`src/lib/theme-context.tsx`	New theme context provider with state management, persistence, and DOM manipulation
`src/hooks/use-theme.ts`	Simplified hook that delegates to the theme context
`src/app/layout.tsx`	Wrapped application with ThemeProvider for global theme access
`src/app/globals.css`	Converted from media query-based to class-based theming with enhanced dark mode support

Copilot · 2025-09-30T07:57:15Z

src/lib/theme-context.tsx

+    setMounted(true)
+
+    // Check for stored theme preference or default to system preference
+    const stored = localStorage.getItem('theme') as Theme | null


The type assertion as Theme | null is unsafe. If localStorage contains an invalid theme value, the type assertion will succeed but the runtime check will fail. Consider using type guards or removing the assertion and relying only on the runtime validation.

Suggested change

const stored = localStorage.getItem('theme') as Theme | null

const stored = localStorage.getItem('theme')

Copilot · 2025-09-30T07:57:15Z

src/lib/theme-context.tsx

+  useEffect(() => {
+    setMounted(true)
+
+    // Check for stored theme preference or default to system preference
+    const stored = localStorage.getItem('theme') as Theme | null
+    if (stored && (stored === 'light' || stored === 'dark')) {
+      setThemeState(stored)
+      applyTheme(stored)
+    } else {
+      // Check system preference
+      const prefersDark = window.matchMedia('(prefers-color-scheme: dark)').matches
+      const systemTheme: Theme = prefersDark ? 'dark' : 'light'
+      setThemeState(systemTheme)
+      applyTheme(systemTheme)
+    }
+  }, [])


The localStorage.getItem() and window.matchMedia() calls should be wrapped in try-catch blocks to handle potential SecurityError exceptions in environments where these APIs are restricted (e.g., sandboxed iframes, private browsing modes).

Initial plan

2e3f942

Copilot AI assigned Copilot and rezwana-karim Sep 30, 2025

Copilot started work on behalf of rezwana-karim September 30, 2025 07:15 View session

Implement fully functional dark/light theme toggle with persistence a…

4fcf439

…nd accessibility Co-authored-by: rezwana-karim <126201034+rezwana-karim@users.noreply.github.com>

Copilot AI changed the title ~~[WIP] Implement Dark/Light Theme Toggle (Enable Theme Switcher)~~ Implement Dark/Light Theme Toggle with Persistence and Accessibility Sep 30, 2025

Copilot finished work on behalf of rezwana-karim September 30, 2025 07:29

Copilot AI requested a review from rezwana-karim September 30, 2025 07:29

rezwana-karim temporarily deployed to github-pages September 30, 2025 07:52 — with GitHub Actions Inactive

rezwana-karim marked this pull request as ready for review September 30, 2025 07:56

Copilot AI review requested due to automatic review settings September 30, 2025 07:56

Copilot AI reviewed Sep 30, 2025

View reviewed changes

rezwana-karim merged commit 3e4b8b8 into main Sep 30, 2025
2 checks passed

syed-reza98 deleted the copilot/fix-b39274f8-a319-4fa5-9617-ebe50a9b841a branch January 14, 2026 15:00

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Implement Dark/Light Theme Toggle with Persistence and Accessibility #38

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	const stored = localStorage.getItem('theme') as Theme \| null
	const stored = localStorage.getItem('theme')

Implement Dark/Light Theme Toggle with Persistence and Accessibility #38

Implement Dark/Light Theme Toggle with Persistence and Accessibility #38

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Problem

Solution

Theme Context Provider (src/lib/theme-context.tsx)

Enhanced CSS Variables (src/app/globals.css)

Layout Integration (src/app/layout.tsx)

Hook Simplification (src/hooks/use-theme.ts)

Features

Screenshots

Light Theme

Dark Theme

Technical Details

Testing

Requirements

Acceptance Criteria

References

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Pull Request Overview

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Copilot AI commented Sep 30, 2025 •

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Theme Context Provider (`src/lib/theme-context.tsx`)

Enhanced CSS Variables (`src/app/globals.css`)

Layout Integration (`src/app/layout.tsx`)

Hook Simplification (`src/hooks/use-theme.ts`)