Update authentication methods and UI components, remove redundant file

This commit accomplishes a few modifications including the elimination of `use-toast.tsx` due to redundancy. The authentication methods in `personal-accounts-server-actions.ts` were refactored to improve service integration and data handling. Additionally, UI components were updated for better readability and clarity. Cascading deletion was enabled in the `schema.sql` file for 'invited_by' reference.

packages/billing/src/schema/report-billing-usage.schema.ts

@@ -0,0 +1,8 @@
+import { z } from 'zod';
+
+export const ReportBillingUsageSchema = z.object({
+  subscriptionId: z.string(),
+  usage: z.object({
+    quantity: z.number(),
+  }),
+});