fix: add crossOrigin="anonymous" to Image component to fix Firefox OpaqueResponseBlocking

[oxygensmith]

In Firefox, all thumbnail images in the media browser fail to load with
OpaqueResponseBlocking errors (NS_BINDING_ABORTED in the network panel).
This does not affect Chrome or Safari.

Root cause: Sanity's CDN returns Vary: Origin on all asset responses.
Firefox's stricter ORB implementation blocks opaque (no-cors) cross-origin
responses when the server declares Vary: Origin. The Image component
renders a plain <img> without a crossOrigin attribute, so the browser
makes a no-cors request and receives an opaque response — which Firefox blocks.

Fix: Adding .attrs({crossOrigin: 'anonymous'}) to the styled component
causes the browser to include an Origin header with every image request.
Sanity's CDN already responds correctly with Access-Control-Allow-Origin
when an Origin is present, so Firefox accepts the response.

What to review

The single change is in src/components/Image/index.tsx — the Image
styled component gains a .attrs({crossOrigin: 'anonymous'}) call.
This affects every place in the plugin that renders image thumbnails
(card view, table view, edit dialog).

Testing

Tested manually by loading the media browser in Firefox with and without
the change. Without it: all thumbnails blocked with NS_BINDING_ABORTED.
With it: all thumbnails load correctly. No regression observed in Chrome.

Automated testing for a browser-specific network behaviour wasn't practical.

[vercel]

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