fix: prevent double query string in GIF draft hydration

When loading a GIF from a draft, the URL was being corrupted with
double query strings like:
`?ww=498&hh=498?hh=498&ww=498`

This happened because:
1. serializeGif() adds ?ww=X&hh=Y&alt=Z to the Tenor URL
2. parseGifFromUrl() returned the full URL including our params
3. resolveGif() in resolve.ts then appends MORE params via string
   concatenation, creating a second ?

Fix: Strip our custom params (ww, hh, alt) from the URL in
parseGifFromUrl() before returning it, so the reconstructed GIF
has a clean base URL.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/view/com/composer/drafts/state/api.ts

@@ -321,7 +321,13 @@ function parseGifFromUrl(
       return undefined
     }
 
-    return {url: uri, width, height, alt}
+    // Strip our custom params to get clean base URL
+    // This prevents double query strings when resolveGif() adds params again
+    url.searchParams.delete('ww')
+    url.searchParams.delete('hh')
+    url.searchParams.delete('alt')
+
+    return {url: url.toString(), width, height, alt}
   } catch {
     return undefined
   }