Use a new env variable to determine whether the user ID should be set to 0 for unauthenticated users

src/pages/root.tsx

@@ -12,6 +12,7 @@ import {
   ALLOW_UNAUTHENTICATED,
   HIDE_HISTORY,
   HTTP_ALLOWED,
+  UNAUTHENTICATED_USER_SHARING,
   WEBROOT,
 } from "../helpers/env";
 import { FIRST_RUN, userService } from "./user";
@@ -33,7 +34,7 @@ export const root = new Elysia()
     let user: ({ id: string } & JWTPayloadSpec) | false = false;
     if (ALLOW_UNAUTHENTICATED) {
       const newUserId = String(
-        ACCOUNT_REGISTRATION ? randomInt(2 ** 24, Math.min(2 ** 48 + 2 ** 24 - 1, Number.MAX_SAFE_INTEGER)) : 0,
+        UNAUTHENTICATED_USER_SHARING ? 0 : randomInt(2 ** 24, Math.min(2 ** 48 + 2 ** 24 - 1, Number.MAX_SAFE_INTEGER)),
       );
       const accessToken = await jwt.sign({
         id: newUserId,