Add local dev Sentry DSN support and fix environment tag for test vs. production

Co-authored-by: Junie <junie@jetbrains.com>

src/main.tsx

@@ -10,7 +10,10 @@ const sentryDsn = import.meta.env.VITE_SENTRY_DSN;
 if (sentryDsn) {
   Sentry.init({
     dsn: sentryDsn,
-    environment: import.meta.env.MODE,
+    // VITE_APP_ENV ('test' | 'production') distinguishes test vs. production builds — both use
+    // `vite build` without an explicit mode, so MODE alone would tag both as 'production'.
+    // Falls back to MODE for local development (`pnpm dev` -> 'development').
+    environment: import.meta.env.VITE_APP_ENV ?? import.meta.env.MODE,
     release: __APP_VERSION__,
     integrations: [Sentry.tanstackRouterBrowserTracingIntegration(router)],
     // Low-traffic marketing site: capture all traces (lower this if traffic grows significantly).