fix: reset Test button after validation completes

components/model-config-dialog.tsx

@@ -290,12 +290,12 @@ export function ModelConfigDialog({
         setValidatingModelIndex(null)
 
         if (allValid) {
-            setValidationStatus("success")
             updateProvider(selectedProviderId!, { validated: true })
         } else {
-            setValidationStatus("error")
             setValidationError(`${errorCount} model(s) failed validation`)
         }
+        // Reset to idle so button shows "Test" again
+        setValidationStatus("idle")
     }, [selectedProvider, selectedProviderId, updateProvider, updateModel])
 
     // Get all available provider types