Add Rich Text Editor with Formatting Toolbar

[prakash601]

Add WYSIWYG rich text editing with toolbar for bold, italic, underline, headings, lists, and text alignment.

Acceptance Criteria

• Bold formatting works (button and Ctrl+B)
• Italic formatting works (button and Ctrl+I)
• Underline formatting works (button and Ctrl+U)
• Heading 1 and 2 work correctly
• Bullet and numbered lists function properly
• Text alignment (left, center, right) works
• Active state indicators highlight correctly
• Auto-save functionality works
• Notes persist after page reload
• Sidebar preview shows clean text
• No console errors

I would like to work on this issue.

[prakash601]

@DhanushNehru I would like to work on it, can you assign it to me?

[prakash601]

@DhanushNehru Kindly tag this issue for Hacktoberfest.

[Pranith2003]

@DhanushNehru, if this still available, i want to work on this!!..