Initial MRP foundation scaffold

client/src/modules/gantt/GanttPage.tsx

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+import { useEffect, useState } from "react";
+import { Gantt } from "@svar-ui/react-gantt";
+import "@svar-ui/react-gantt/style.css";
+
+import type { GanttLinkDto, GanttTaskDto } from "@mrp/shared";
+
+import { useAuth } from "../../auth/AuthProvider";
+import { api } from "../../lib/api";
+
+export function GanttPage() {
+  const { token } = useAuth();
+  const [tasks, setTasks] = useState<GanttTaskDto[]>([]);
+  const [links, setLinks] = useState<GanttLinkDto[]>([]);
+
+  useEffect(() => {
+    if (!token) {
+      return;
+    }
+
+    api.getGanttDemo(token).then((data) => {
+      setTasks(data.tasks);
+      setLinks(data.links);
+    });
+  }, [token]);
+
+  return (
+    <section className="rounded-[28px] border border-line/70 bg-surface/90 p-8 shadow-panel">
+      <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Planning</p>
+      <h3 className="mt-3 text-2xl font-bold text-text">SVAR Gantt Preview</h3>
+      <p className="mt-2 text-sm text-muted">Theme-aware integration wrapper prepared for future manufacturing schedules and task dependencies.</p>
+      <div className="gantt-theme mt-6 overflow-hidden rounded-2xl border border-line/70 bg-page/70 p-4">
+        <Gantt
+          tasks={tasks.map((task) => ({
+            ...task,
+            start: new Date(task.start),
+            end: new Date(task.end),
+          }))}
+          links={links}
+        />
+      </div>
+    </section>
+  );
+}