feat(figma): design dark mode search and creator directory views

[shepherd-001]

Summary

Designed the Dark Mode UI/UX for StellarProof's search and creator discovery experience in Figma, including advanced filtering, creator directory results, and no-results/empty states.

What Was Done

• Created high-fidelity Dark Mode designs for the search and creator discovery experience.
• Designed an advanced search filters modal for filtering assets by date, SPV privacy status, file type, and creator.
• Designed the searchable Creator Directory for discovering verified creators.
• Designed search no-results states with clear messaging and supporting visual elements.
• Designed empty vault states for creators or asset grids with appropriate guidance and visuals.
• Applied consistent Dark Mode surfaces, typography, spacing, alignment, and contrast.
• Used reusable Figma components and auto-layout for maintainable designs.
• Created responsive layouts and variants where appropriate.
• Organized frames, layers, and components with clear naming and structure.
• Ensured consistency across search, filtering, creator discovery, and empty-state experiences.

Scope

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

Related Issues

Closes #569
Closes #570
Closes #571
Closes #572

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[Tybravo]

@shepherd-001

Nice work done.

Thank you for contributing