fix(client): quick fixes for top PostHog errors (#436)

src/client/lib/posthog.ts

@@ -40,6 +40,13 @@ function isIgnorableException(
     if (value.includes("Object Not Found Matching Id")) return true;
     if (value === "Script error.") return true;
     if (value.includes("signal is aborted without reason")) return true;
+    // ResizeObserver's loop warning is benign by spec (the browser defers
+    // delivery to the next frame) but surfaces as an error. Caveat: this also
+    // mutes a real ResizeObserver->setState feedback loop, if we ship one.
+    if (value.includes("ResizeObserver loop")) return true;
+    // The PostHog SDK's own network timeouts — capturing them just makes error
+    // tracking report on itself.
+    if (value.includes("PostHog request timed out")) return true;
     if (value === "CancelledError") return true;
     const frames = entry?.stacktrace?.frames;
     return (

src/router.tsx

@@ -3,6 +3,36 @@ import { routeTree } from "./routeTree.gen";
 import { DefaultCatchBoundary } from "./client/components/DefaultCatchBoundary";
 import { NotFound } from "./client/components/NotFound";
 
+const PRELOAD_ERROR_RELOAD_KEY = "vite-preload-error-reloaded-at";
+
+// After a deploy replaces the hashed chunks, dynamic imports in already-open
+// tabs 404 ("Importing a module script failed." / "Unexpected token '<'").
+// Reload to pick up the new build, at most once per 30s so a failure a reload
+// can't fix surfaces as an error instead of looping. Registered at module
+// scope, not in a component, so it also catches chunks that fail while
+// hydration is still in progress. Vite only emits this event in builds —
+// exercise it via `vite preview` or a deploy, never `vite dev`.
+if (typeof window !== "undefined") {
+  window.addEventListener("vite:preloadError", (event) => {
+    try {
+      const reloadedAt = Number(
+        window.sessionStorage.getItem(PRELOAD_ERROR_RELOAD_KEY) ?? 0,
+      );
+      if (Date.now() - reloadedAt < 30_000) return;
+      window.sessionStorage.setItem(
+        PRELOAD_ERROR_RELOAD_KEY,
+        String(Date.now()),
+      );
+    } catch {
+      // Without sessionStorage we can't bound reload attempts, so let the
+      // error surface instead of risking a reload loop.
+      return;
+    }
+    event.preventDefault();
+    window.location.reload();
+  });
+}
+
 export function getRouter() {
   const router = createTanStackRouter({
     routeTree,