feat: allow admins to require invites before user accounts can be created (#3381)

* allow admins to require invites before user accounts can be created
* use new dialog component for general confirmation dialogs

app/components/ConfirmationDialog.tsx

@@ -0,0 +1,58 @@
+import { observer } from "mobx-react";
+import * as React from "react";
+import Button from "~/components/Button";
+import Flex from "~/components/Flex";
+import Text from "~/components/Text";
+import useStores from "~/hooks/useStores";
+import useToasts from "~/hooks/useToasts";
+
+type Props = {
+  onSubmit: () => void;
+  children: JSX.Element;
+  submitText?: string;
+  savingText?: string;
+  danger?: boolean;
+};
+
+function ConfirmationDialog({
+  onSubmit,
+  children,
+  submitText,
+  savingText,
+  danger,
+}: Props) {
+  const [isSaving, setIsSaving] = React.useState(false);
+  const { dialogs } = useStores();
+  const { showToast } = useToasts();
+
+  const handleSubmit = React.useCallback(
+    async (ev: React.SyntheticEvent) => {
+      ev.preventDefault();
+      setIsSaving(true);
+      try {
+        await onSubmit();
+        dialogs.closeAllModals();
+      } catch (err) {
+        showToast(err.message, {
+          type: "error",
+        });
+      } finally {
+        setIsSaving(false);
+      }
+    },
+    [onSubmit, dialogs, showToast]
+  );
+
+  return (
+    <Flex column>
+      <form onSubmit={handleSubmit}>
+        <Text type="secondary">{children}</Text>
+        <Button type="submit" disabled={isSaving} danger={danger} autoFocus>
+          {isSaving ? savingText : submitText}
+        </Button>
+      </form>
+    </Flex>
+  );
+}
+
+export default observer(ConfirmationDialog);