feat: P1 Calendar — CalendarView (month/week/list, drag&drop, channel filter)

app/calendar/page.js

@@ -0,0 +1,36 @@
+import { redirect } from 'next/navigation';
+import { requireUser } from '@/lib/session';
+import { engine } from '@/lib/engine';
+import Header from '@/components/Header';
+import CalendarView from '@/components/CalendarView';
+
+export const metadata = { title: 'Календарь публикаций — ZeroPost' };
+
+export default async function CalendarPage() {
+  const user = await requireUser();
+  if (!user) redirect('/login');
+
+  let channels = [];
+  try {
+    channels = await engine.listChannels(user.id);
+  } catch (e) {
+    console.error('[Calendar] listChannels failed:', e.message);
+  }
+
+  return (
+    <>
+      <Header user={user} />
+      <main className="max-w-7xl mx-auto p-4 sm:p-6">
+        <div className="flex items-center justify-between mb-6">
+          <div>
+            <h1 className="text-2xl font-bold">Календарь публикаций</h1>
+            <p className="text-sm text-gray-500 mt-1">
+              Планируй и отслеживай выход постов по всем каналам
+            </p>
+          </div>
+        </div>
+        <CalendarView channels={channels} />
+      </main>
+    </>
+  );
+}