Initial commit: Kalendartool (Next.js, Prisma, Docker)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

app/forgot-password/page.tsx

@@ -0,0 +1,67 @@
+'use client';
+
+/**
+ * "Passwort vergessen"-Seite (plan.md Abschnitt 11).
+ * Antwortet immer mit Erfolgsmeldung (kein Account-Enumeration).
+ */
+import { useState } from 'react';
+import Link from 'next/link';
+import { Button, Card, ErrorMessage, Input, Label } from '@/components/ui/ui';
+
+export default function ForgotPasswordPage() {
+  const [submitted, setSubmitted] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+  const [busy, setBusy] = useState(false);
+
+  async function handleSubmit(event: React.FormEvent<HTMLFormElement>) {
+    event.preventDefault();
+    setBusy(true);
+    setError(null);
+
+    const formData = new FormData(event.currentTarget);
+    try {
+      const response = await fetch('/api/auth/forgot-password', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ email: formData.get('email') }),
+      });
+      if (!response.ok) {
+        const data = (await response.json()) as { error?: string };
+        setError(data.error ?? 'Anfrage fehlgeschlagen.');
+        return;
+      }
+      setSubmitted(true);
+    } catch {
+      setError('Netzwerkfehler. Bitte erneut versuchen.');
+    } finally {
+      setBusy(false);
+    }
+  }
+
+  return (
+    <main className="mx-auto flex min-h-screen max-w-md flex-col justify-center px-4">
+      <h1 className="mb-6 text-center text-2xl font-bold">Passwort vergessen</h1>
+      <Card>
+        {submitted ? (
+          <p className="rounded-md bg-slate-100 px-3 py-2 text-sm text-slate-700 dark:bg-slate-800 dark:text-slate-300">
+            Falls die E-Mail registriert ist, wurde ein Reset-Link erstellt.
+          </p>
+        ) : (
+          <form onSubmit={handleSubmit} className="space-y-4">
+            <ErrorMessage message={error} />
+            <div>
+              <Label htmlFor="email">E-Mail</Label>
+              <Input id="email" name="email" type="email" required />
+            </div>
+            <Button disabled={busy}>{busy ? 'Senden …' : 'Reset-Link anfordern'}</Button>
+          </form>
+        )}
+        <p className="mt-4 text-sm">
+          <Link href="/login" className="text-slate-700 underline hover:text-slate-900 dark:text-slate-300 dark:hover:text-slate-100">
+            Zurueck zur Anmeldung
+          </Link>
+        </p>
+      </Card>
+    </main>
+  );
+}