Consolidate Sentry config into shared package; fix inconsistencies

Introduces @trails-cool/sentry-config with three helpers that encode
the common Sentry.init options:
- nodeSentryConfig(appContext) for the two HTTP servers
- browserSentryConfig(appContext, env) for the Journal client
- mobileSentryConfig(__DEV__) for the React Native app
- drop404s beforeSend for servers

Also fixes three inconsistencies found in the audit:
- Planner server was missing sendDefaultPii: false (IPs could leak)
- Planner entry.server.tsx didn't call Sentry.captureException on SSR
  render errors; Journal's SSR did
- Sentry.init location now matches across apps (both in server.ts;
  Journal previously had it in app/entry.server.tsx, which meant init
  ran lazily on first request rather than at server startup)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/planner/server.ts

@@ -1,4 +1,5 @@
 import * as Sentry from "@sentry/node";
+import { nodeSentryConfig, drop404s } from "@trails-cool/sentry-config";
 import { logger } from "./app/lib/logger.server.ts";
 import { httpRequestDuration } from "./app/lib/metrics.server.ts";
 import { createRequestListener } from "@react-router/node";
@@ -10,26 +11,12 @@ import { createBoss, startWorker } from "@trails-cool/jobs";
 import { expireSessionsJob } from "./app/jobs/expire-sessions.ts";
 import postgres from "postgres";
 
-const sentryEnvironment = process.env.CI ? "ci" : (process.env.NODE_ENV ?? "development");
-const sentryEnabled = process.env.NODE_ENV === "production" && !process.env.CI;
-
 Sentry.init({
   dsn: "https://5215134cd78d5e6c199e29300b8425af@o4509530546634752.ingest.de.sentry.io/4511102546608208",
-  release: process.env.SENTRY_RELEASE,
-  environment: sentryEnvironment,
-  tracesSampleRate: 1.0,
-  enabled: sentryEnabled,
-  beforeSend(event) {
-    const serialized = event.extra?.__serialized__ as Record<string, unknown> | undefined;
-    if (serialized?.status === 404) return null;
-    return event;
-  },
+  ...nodeSentryConfig("planner server"),
+  beforeSend: drop404s,
 });
 
-if (!sentryEnabled && !process.env.CI) {
-  console.debug(`[sentry] planner server init inert (env=${sentryEnvironment}); would send to Sentry in production`);
-}
-
 const port = Number(process.env.PORT ?? 3001);
 const CLIENT_DIR = resolve(import.meta.dirname, "build", "client");