Remove use-toast.tsx, refactor auth methods, and update UI components

This commit removes the redundant `use-toast.tsx` file and refactors the authentication methods in `personal-accounts-server-actions.ts` to enhance service integration and data handling. UI components like `LanguageDropdownSwitcher` and `site-header-account-section.tsx` have been refined for better readability. Changes in the `config.tsx` file aim to improve the overall code cleanliness. The `schema.sql` file under migrations was updated to cascade delete for 'invited_by' reference.

packages/ui/src/shadcn/command.tsx

@@ -42,6 +42,7 @@ const CommandInput = React.forwardRef<
   React.ElementRef<typeof CommandPrimitive.Input>,
   React.ComponentPropsWithoutRef<typeof CommandPrimitive.Input>
 >(({ className, ...props }, ref) => (
+  // eslint-disable-next-line react/no-unknown-property
   <div className="flex items-center border-b px-3" cmdk-input-wrapper="">
     <MagnifyingGlassIcon className="mr-2 h-4 w-4 shrink-0 opacity-50" />
     <CommandPrimitive.Input