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frontend/src/routes/AtlasPage.tsx

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+import { useAllStructures } from "../hooks/useStructures.js";
+import { Scene } from "../components/viewer/Scene.js";
+import { LayerToggle } from "../components/LayerToggle.js";
+import { ClippingControls } from "../components/ClippingControls.js";
+import { SearchNav } from "../components/SearchNav.js";
+import { StructureInfoPanel } from "../components/StructureInfoPanel.js";
+
+export default function AtlasPage() {
+  const { structures, bySlug } = useAllStructures();
+
+  return (
+    <div className="h-full grid grid-cols-[280px_1fr_320px]">
+      <aside className="border-r border-white/10 bg-panel p-3 flex flex-col min-h-0">
+        <LayerToggle />
+        <ClippingControls />
+        <div className="flex-1 min-h-0 mt-4">
+          <SearchNav structures={structures} />
+        </div>
+      </aside>
+
+      <div className="relative">
+        <Scene bySlug={bySlug} />
+      </div>
+
+      <aside className="border-l border-white/10 bg-panel p-4 overflow-y-auto">
+        <StructureInfoPanel bySlug={bySlug} />
+      </aside>
+    </div>
+  );
+}