Filter 404s from Sentry on client and server

Client ErrorBoundary: skip captureException for HTTP errors < 500.
Server beforeSend: drop events where __serialized__.status is 404.

Resolves JOURNAL-2 and JOURNAL-8 (scanner bot noise).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/journal/app/entry.server.tsx

@@ -15,6 +15,12 @@ Sentry.init({
   environment: sentryEnvironment,
   tracesSampleRate: 1.0,
   enabled: process.env.NODE_ENV === "production" && !process.env.CI,
+  beforeSend(event) {
+    // Drop 404s — they're expected (scanners, typos), not bugs
+    const serialized = event.extra?.__serialized__ as Record<string, unknown> | undefined;
+    if (serialized?.status === 404) return null;
+    return event;
+  },
 });
 
 export const streamTimeout = 5_000;

apps/journal/app/root.tsx

@@ -123,7 +123,10 @@ export default function App({ loaderData }: Route.ComponentProps) {
 }
 
 export function ErrorBoundary({ error }: Route.ErrorBoundaryProps) {
-  Sentry.captureException(error);
+  // Don't report expected HTTP errors (404, 403) to Sentry
+  if (!(isRouteErrorResponse(error) && error.status < 500)) {
+    Sentry.captureException(error);
+  }
   const { t } = useTranslation();
 
   if (isRouteErrorResponse(error)) {

apps/planner/app/root.tsx

@@ -33,7 +33,9 @@ export default function App() {
 }
 
 export function ErrorBoundary({ error }: Route.ErrorBoundaryProps) {
-  Sentry.captureException(error);
+  if (!(isRouteErrorResponse(error) && error.status < 500)) {
+    Sentry.captureException(error);
+  }
   const { t } = useTranslation();
 
   if (isRouteErrorResponse(error)) {

apps/planner/server.ts

@@ -13,6 +13,11 @@ Sentry.init({
   environment: sentryEnvironment,
   tracesSampleRate: 1.0,
   enabled: process.env.NODE_ENV === "production" && !process.env.CI,
+  beforeSend(event) {
+    const serialized = event.extra?.__serialized__ as Record<string, unknown> | undefined;
+    if (serialized?.status === 404) return null;
+    return event;
+  },
 });
 
 const port = Number(process.env.PORT ?? 3001);