TokenMetadata: display IPFS image with fallback placeholder

[Ejirowebfi]

Description

TokenMetadata.tsx renders the metadata URI as text but does not display the token image. When a valid IPFS image URI is present, it should be rendered.

Tasks

• Parse the IPFS URI and construct a Pinata gateway URL
• Render an <img> tag with the gateway URL
• Show a placeholder icon when the image fails to load or URI is absent
• Lazy-load the image to avoid blocking the page

Acceptance Criteria

• Token image is displayed when a valid IPFS URI is set
• A placeholder icon is shown for tokens without metadata
• Broken image URLs show the placeholder, not a broken image icon