feat(figma): design dark mode certificate search and asset views

[Glorious21]

Summary

Designed the Dark Mode UI/UX for StellarProof's global certificate search results and digital asset management experiences in Figma, covering both grid and list/table-based views.

What Was Done

• Created high-fidelity Dark Mode designs for certificate search and digital asset views.
• Designed global certificate search results in a structured list view.
• Designed a visual grid view for browsing verified certificate assets.
• Designed a data-rich asset table with KMS encryption status and verification timestamps.
• Designed a visual asset gallery with thumbnails for verified images and videos.
• Applied consistent Dark Mode surfaces, typography, spacing, alignment, and contrast.
• Used reusable Figma components and auto-layout for maintainable designs.
• Created responsive layouts and view variants where appropriate.
• Organized frames, layers, and components with clear naming and structure.
• Ensured consistency between grid, list, and table experiences across the platform.

Scope

This PR contains Figma/UI/UX design work only and does not include frontend implementation.

Related Issues

Closes #565
Closes #566
Closes #567
Closes #568

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[Tybravo]

@Glorious21

Nice work you did. Thank you for your contribution