Design: create dark mode main navbar

[QueenColly]

Closes #390

Summary of Work:
Completed the high-fidelity design for the Main Navbar following the platform's Dark Mode visual guidelines. The design has been modularized for efficient hand-off to the frontend team.

Design Highlights:

Theme: Applied the dark background surface color palette with optimized contrast ratios for high readability.

Architecture: Built using a component-based approach with Auto-Layout, ensuring the navbar is fully responsive across different viewport sizes.

Consistency: Ensured all typography, spacing, and icon alignment align with the existing platform design system.

Organization: All layers are properly named, frames are grouped logically, and reusable components are documented for easier implementation.

Deliverables:

High-fidelity Figma frames for desktop and mobile layouts.

Component library updates for the new navigation elements.

[vercel]

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