Add Dark Mode Toggle Feature

[jamunatg2006-sys]

Description

Overview

The project currently lacks a dark mode option. Adding a theme switcher will improve accessibility and user experience.

Features to Implement

• Add light/dark theme toggle button
• Store theme preference in localStorage
• Smooth transition between themes
• Ensure all components support dark mode styling

Expected Outcome

Users should be able to switch themes without page reloads.

Acceptance Criteria

• Theme persists after refresh
• No unreadable text/background combinations
• Toggle button accessible on all pages

[jamunatg2006-sys]

@singhtrivendra ,please approval this Merge ,waiting since 1 week please loook into it

[github-actions]

This issue is stale because it has been open 30 days with no activity.