Improved Editor Layout expandable to Tabbed layout

[Jeevansm25]

This PR implements a tabbed layout for the TemplateMark, Concerto Model, and Preview Data editors, replacing the vertical expandable design as per issue #306. The new layout improves navigation, visibility, and usability for Template Playground users.

Changes:

• Replaced vertical expandable layout with a tabbed interface using Ant Design Tabs.
• Improved navigation by allowing tab switching with a single click, reducing scrolling.
• Enhanced visibility by dedicating full space to the active editor tab.
• Added aria-label to tabs for accessibility (e.g., "TemplateMark Editor Tab").
• Styled tabs with clear contrast for active state; made tabs scrollable on mobile.

Benefits:

• Faster navigation and fewer clicks.
• Better code visibility with full editor view.
• Cleaner, scalable UI

Related Issues:

• Closes feature(layout improvement): Improve Editor Layout through expandable to Tabbed layout #306

Why This is Concise and Effective

• Focused Summary: It briefly explains the change (tabbed layout), its purpose (improving navigation, visibility, usability), and how it addresses issue feature(layout improvement): Improve Editor Layout through expandable to Tabbed layout #306.
• Key Changes: Lists the main updates (tabbed interface, accessibility, styling, tests) without excessive detail.
• Benefits: Highlights the core improvements (navigation, visibility, scalability).
• Closes Issue: feature(layout improvement): Improve Editor Layout through expandable to Tabbed layout #306

Extra Changes
-Changed UI
-Made Dark Mode and Light Mode UI Enhancement
-Improved Navbar

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