[New Rich Text Editor]: implement insertion toolbar actions

[habibayman]

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Desired behavior

The new editions to the component should:

• Be accessible via http://localhost:8080/editor-dev#/
• Support insertion buttons for:
  • Image upload handling which should include for the uploaded image:
    • resizing
    • deleting
    • replacing
  • Code blocks with syntax highlighting
  • External Links with full editing experience
  • Math equations
  • Superscript/subscript formatting
• Maintain existing support for:
  • Text styling: bold, italic, underline, strikethrough
  • List formatting: unordered, ordered
  • Headings: small, normal, h1–h3
  • Undo/redo, copy/paste (with formatting options)
  • Keyboard navigation (including tab traversal)
  • RTL language support
  • Internationalization (i18n)
• Match the planned design

Current behavior

• TipTap and core formatting features are already implemented
• Component is available for isolated development at http://localhost:8080/editor-dev#/
• New docs file (e.g. docs/rich_text_editor.md) is updated with component integration notes
• The insertion buttons listed above are not yet added or functional

Value add

This sub-issue is part of the overall feature tracked in [main tracking issue](#5049). Completing the insertion buttons will significantly enhance the editor’s usability by enabling embedding media, advanced formatting, and rich content creation.

Next step

Now that we have a fully functioning toolabr, we have to step to maintaining legacy markdown conversion

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Add labels

• dependencies
• DEV: frontend

[habibayman]

Can you please assign me and add it to the parent issue :) ? @marcellamaki @nucleogenesis