Integrate User-Provided Image URLs into Token Cards & Details Pages

### Description
When users create a token, they input an image URL. This URL Image should be displayed:
- On the homepage token cards (thumbnail)
- On the token details page (full-size image)

### Acceptance Criteria
- Fetch and display the image URL from the token’s metadata in the frontend.
- Add image rendering to `Home.tsx` (homepage) and `token-detail/address.tsx`.
- Implement error handling for broken URLs (e.g., fallback placeholder image).
- Ensure images are optimized (lazy-loading, CDN caching).