triggerdotdev · samejr · May 13, 2026 · May 12, 2026 · May 12, 2026
diff --git a/apps/webapp/app/clientBeforeFirstRender.ts b/apps/webapp/app/clientBeforeFirstRender.ts
@@ -0,0 +1,38 @@
+/**
+ * Runs once on the client, synchronously, before React hydrates the app.
+ * Reserved for housekeeping that must happen before any component mounts.
+ */
+export function clientBeforeFirstRender() {
+  cleanupLegacyResizablePanelStorage();
+}
+
+/**
+ * Earlier versions of the resizable panel library wrote a per-session
+ * localStorage entry for every PanelGroup, including ones without an
+ * `autosaveId`. The keys look like `panel-group-react-aria<n>-:<rid>:`
+ * and accumulate without bound across sessions until they exhaust the
+ * ~5 MB origin quota and break subsequent `setItem` calls.
+ *
+ * The library no longer behaves this way, but existing users still carry
+ * the residue. Evict it (plus the orphaned `panel-run-parent-v2` key from
+ * the v2→v3 autosaveId bump) once on load.
+ */
+function cleanupLegacyResizablePanelStorage() {
+  try {
+    const toRemove: string[] = [];
+    for (let i = 0; i < window.localStorage.length; i++) {
+      const key = window.localStorage.key(i);
+      if (
+        key &&
+        (key.startsWith("panel-group-react-aria") || key === "panel-run-parent-v2")
+      ) {
+        toRemove.push(key);
+      }
+    }
+    for (const key of toRemove) {
+      window.localStorage.removeItem(key);
+    }
+  } catch {
+    // localStorage may be disabled (private browsing, security policy)
+  }
+}
diff --git a/apps/webapp/app/entry.client.tsx b/apps/webapp/app/entry.client.tsx
@@ -1,8 +1,11 @@
 import { RemixBrowser } from "@remix-run/react";
 import { hydrateRoot } from "react-dom/client";
+import { clientBeforeFirstRender } from "./clientBeforeFirstRender";
 import { LocaleContextProvider } from "./components/primitives/LocaleProvider";
 import { OperatingSystemContextProvider } from "./components/primitives/OperatingSystemProvider";

+clientBeforeFirstRender();
+
 hydrateRoot(
  document,
  <OperatingSystemContextProvider