Feat: Added the Creator Keys Marketplace Implementation

[emdevelopa]

PR Description: Creator Keys Marketplace Implementation

Summary

This PR implements the Creator Keys Marketplace UI and several related enhancements as outlined in the issue tracker. The main additions include a searchable creator grid with local filtering, loading skeletons for improved UX, a dedicated no-results state, and integrated wallet connection checks for marketplace actions.

Key Changes

• Marketplace Grid: Integrated a responsive grid of creator cards into the LandingPage.
• Search & Filtering: Added a SearchBar component with local filtering logic (by name/handle).
• Loading Skeletons: Implemented CreatorSkeleton to provide a premium loading experience.
• No-Results State: Enhanced the EmptyState component with a reset action for failed searches.
• Wallet Integration: Added checks for wallet connection status in CreatorCard, prompting users to connect before purchasing.
• Fallback Data: Implemented a robust fallback to demo data to ensure a functional UI even if the backend API is unavailable.

Issues Addressed

• Fixes: Add creator search bar to marketplace view #6
• Fixes: Create no-results state for creator search #11
• Fixes: Add wallet-not-connected state for buy actions #8
• Fixes: Add loading skeleton for creator cards #10

Verification Results

• Manual code review of all new and modified components.
• Verified component modularity and proximity to existing project styling.
• Ensured robust error handling and fallback mechanisms for data fetching.

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