Dark Mode Support Implementation

[yoursanonymous]

Overview

This PR adds comprehensive dark mode support to the Volcano Dashboard, enhancing user experience in low-light environments and providing theme customization options.

Changes Made

• Added theme context for managing dark/light mode state
• Implemented system theme detection and user preference persistence
• Added theme toggle button in the app header
• Updated UI components to support theme switching

Theme Configuration

• Added dark mode color palette with proper contrast ratios

Features

• Automatic system theme detection
• Theme preference persistence in localStorage

Screenshots

[volcano-sh-bot]

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[yoursanonymous]

/assign @Monokaix

[karanBRAVO]

I feel it would be great if you add a theme selection pane and provide a list of themes from which user can select one

Eg: https://monkeytype.com/ (see on the bottom-right corner)
it will look like this