Update env stuff because I don't think it was all working right.

apps/next/src/env.js

@@ -0,0 +1,45 @@
+import { createEnv } from '@t3-oss/env-nextjs';
+import { z } from 'zod/v4';
+
+export const env = createEnv({
+  server: {
+    NODE_ENV: z
+      .enum(['development', 'production', 'test'])
+      .default('development'),
+    SKIP_ENV_VALIDATION: z.boolean().default(false),
+    SENTRY_AUTH_TOKEN: z.string(),
+    CI: z.boolean().default(false),
+  },
+
+  /**
+   * Specify your client-side environment variables schema here.
+   * For them to be exposed to the client, prefix them with `NEXT_PUBLIC_`.
+   */
+  client: {
+    NEXT_PUBLIC_SITE_URL: z.url(),
+    NEXT_PUBLIC_CONVEX_URL: z.url(),
+    NEXT_PUBLIC_PLAUSIBLE_URL: z.url(),
+    NEXT_PUBLIC_SENTRY_DSN: z.string(),
+    NEXT_PUBLIC_SENTRY_URL: z.string(),
+    NEXT_PUBLIC_SENTRY_ORG: z.string(),
+    NEXT_PUBLIC_SENTRY_PROJECT_NAME: z.string(),
+  },
+  /**
+   * Destructure all variables from `process.env` to make sure they aren't tree-shaken away.
+   */
+  runtimeEnv: {
+    NODE_ENV: process.env.NODE_ENV,
+    SKIP_ENV_VALIDATION: process.env.SKIP_ENV_VALIDATION,
+    SENTRY_AUTH_TOKEN: process.env.SENTRY_AUTH_TOKEN,
+    CI: process.env.CI,
+    NEXT_PUBLIC_SITE_URL: process.env.NEXT_PUBLIC_SITE_URL,
+    NEXT_PUBLIC_CONVEX_URL: process.env.NEXT_PUBLIC_CONVEX_URL,
+    NEXT_PUBLIC_PLAUSIBLE_URL: process.env.NEXT_PUBLIC_PLAUSIBLE_URL,
+    NEXT_PUBLIC_SENTRY_DSN: process.env.NEXT_PUBLIC_SENTRY_DSN,
+    NEXT_PUBLIC_SENTRY_URL: process.env.NEXT_PUBLIC_SENTRY_URL,
+    NEXT_PUBLIC_SENTRY_ORG: process.env.NEXT_PUBLIC_SENTRY_ORG,
+    NEXT_PUBLIC_SENTRY_PROJECT_NAME: process.env.NEXT_PUBLIC_SENTRY_PROJECT_NAME,
+  },
+  skipValidation: !!process.env.SKIP_ENV_VALIDATION,
+  emptyStringAsUndefined: true,
+});