feat: xAI image generate/edit, API key import, and per-provider timeouts

- Add dedicated xAI image adapter with generate + edit (multi-image) via
  /v1/images/generations and /v1/images/edits, plus aspect_ratio/resolution UI
- Support importing existing API keys and exposing connection api-key routes
- Add global/per-provider connect timeout overrides from settings
- Keep unrelated provider UX improvements on this branch; no Grok quota tracking

src/shared/components/EditConnectionModal.js

@@ -171,7 +171,7 @@ export default function EditConnectionModal({ isOpen, connection, proxyPools, on
       if (providerRegions && region) {
         updates.providerSpecificData = buildRegionSpecificData();
       }
-      
+
       await onSave(updates);
     } finally {
       setSaving(false);
@@ -202,6 +202,8 @@ export default function EditConnectionModal({ isOpen, connection, proxyPools, on
           onChange={(e) => setFormData({ ...formData, priority: Number.parseInt(e.target.value, 10) || 1 })}
         />
 
+        
+
         {!isOAuth && (
           <>
             <div className="flex gap-2">