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/journal/server.ts

@@ -1,3 +1,5 @@
+import * as Sentry from "@sentry/node";
+import { nodeSentryConfig, drop404s } from "@trails-cool/sentry-config";
 import { createRequestListener } from "@react-router/node";
 import { createServer, type IncomingMessage, type ServerResponse } from "node:http";
 import { createReadStream, statSync } from "node:fs";
@@ -7,6 +9,12 @@ import { httpRequestDuration, registry } from "./app/lib/metrics.server.ts";
 import { createBoss, startWorker } from "@trails-cool/jobs";
 import postgres from "postgres";
 
+Sentry.init({
+  dsn: "https://a32ffcc575d34be072e91b20f247eeee@o4509530546634752.ingest.de.sentry.io/4509530555547728",
+  ...nodeSentryConfig("journal server"),
+  beforeSend: drop404s,
+});
+
 const port = Number(process.env.PORT ?? 3000);
 const CLIENT_DIR = resolve(import.meta.dirname, "build", "client");