add user management features: implement user creation, editing, and deletion; enhance dashboard with user selection prompt; improve token verification and alert handling

admin/src/components/AddForm.tsx

@@ -0,0 +1,79 @@
+import React from "react";
+import { Button, Card, Field, Input, Stack } from "@chakra-ui/react";
+import { createUser } from "@/utils/userActions";
+
+type AddFormProps = {
+  onClose: () => void;
+  alert: (
+    status: "success" | "error",
+    message: string,
+    description: string
+  ) => void;
+};
+
+const AddForm: React.FC<AddFormProps> = ({ onClose, alert }) => {
+  return (
+    <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/60 backdrop-blur-sm p-4">
+      <Card.Root maxW="sm">
+        <Card.Header>
+          <Card.Title>Neuen Nutzer erstellen</Card.Title>
+          <Card.Description>
+            Füllen Sie das folgende Formular aus, um einen Nutzer zu erstellen.
+          </Card.Description>
+        </Card.Header>
+        <Card.Body>
+          <Stack gap="4" w="full">
+            <Field.Root>
+              <Field.Label>Username</Field.Label>
+              <Input id="username" />
+            </Field.Root>
+            <Field.Root>
+              <Field.Label>Password</Field.Label>
+              <Input id="password" type="password" />
+            </Field.Root>
+            <Field.Root>
+              <Field.Label>Role</Field.Label>
+              <Input id="role" type="number" />
+            </Field.Root>
+          </Stack>
+        </Card.Body>
+        <Card.Footer justifyContent="flex-end">
+          <Button variant="outline" onClick={onClose}>
+            Abbrechen
+          </Button>
+          <Button
+            variant="solid"
+            onClick={async () => {
+              const username =
+                (
+                  document.getElementById("username") as HTMLInputElement
+                )?.value.trim() || "";
+              const password =
+                (document.getElementById("password") as HTMLInputElement)
+                  ?.value || "";
+              const role = Number(
+                (document.getElementById("role") as HTMLInputElement)?.value
+              );
+
+              if (!username || !password || Number.isNaN(role)) return;
+
+              const res = await createUser(username, role, password);
+              if (res.success) {
+                alert(
+                  "success",
+                  "Nutzer erstellt",
+                  "Der Nutzer wurde erfolgreich erstellt."
+                );
+                onClose();
+              }
+            }}
+          >
+            Erstellen
+          </Button>
+        </Card.Footer>
+      </Card.Root>
+    </div>
+  );
+};
+
+export default AddForm;