UI Fix and enhancement

[Klath123]

Improve Dark Theme, Update model.yml to v4, and Fix Sidenav Issues

Summary

This PR introduces UI improvements and configuration updates to enhance the overall user experience and maintain consistency.

---

Changes Made

1. Improve Dark Theme

• Enhanced color contrast for better readability.
• Improved background and surface color consistency.
• Refined text visibility across components.

2. Update model.yml to v4

• Migrated configuration to version 4.
• Ensured compatibility with the updated structure.

3. Remove Ribbon

• Removed the ribbon component as it was already present in the sidenav.
• Eliminated redundant UI elements for a cleaner layout.

4. Fix Sidenav Overflow on Scroll

• Resolved the issue where the sidenav overflowed during scrolling.
• Improved layout stability and responsiveness.

---

Demo Videos

Before

Screen.Recording.2026-02-24.085540.mp4

After

Screen.Recording.2026-02-24.090200.mp4

---

Please let me know if any additional refinements are needed.