Added Ctrl + K Theme Toggle Shortcut and Enhanced Create Post Page UI

[deepanshu-prajapati01]

Hi team 👋

This PR introduces convenient keyboard shortcut support and improves the user interface of the Create New Post page for a smoother experience.

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🔍 Problem Resolved:

• Theme switching was manual; no shortcut key was available for toggling between light and dark modes.
• The Create Post page lacked some essential UI elements such as a cancel button, limiting usability and user control during post creation.

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✅ What’s Changed:

• Added Ctrl + K keyboard shortcut to toggle the app theme instantly.
• Improved the Create New Post page UI:
  • Added a cancel button to allow users to abort post creation seamlessly.
  • Enhanced layout and interaction flow for better usability.
  • Applied minor styling fixes for consistency and polish.

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📷 Screenshots:

Before:

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After:

🎯 Result / Benefit:

• Users can toggle themes rapidly using a keyboard shortcut, improving accessibility.
• Post creation becomes more user-friendly with clear cancel options and refined UI.
• Overall better experience and interface consistency on the Create Post page.

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🏷 Labels Requested:

• gssoc2025
• level3
• frontend

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