refactor: Replace window global with direct import in toast-error

- Import showToast function directly from toast module
- Remove dependency on window global for error handling
- Simplify code and improve type safety

This change aligns with the ESBuild migration by using proper ES module
imports instead of runtime global lookups.

web/src/toast-error.ts

@@ -1,9 +1,8 @@
 import { Alpine } from "./alpine";
+import { showToast } from "./toast";
 
 function showErrorToast(message: string): void {
-  // Use the global showToast from toast.ts
-  if (typeof (window as any).showToast !== "undefined") {
-    (window as any).showToast.error(message, 8000);
+  showToast(message, "error", 8000);
 
   // Add retry button to the toast
   setTimeout(() => {
@@ -27,7 +26,6 @@ function showErrorToast(message: string): void {
       }
     }
   }, 100);
-  }
 }
 
 export { showErrorToast };