feat: update local authentication mode to require a non-placeholder token of at least 50 characters

frontend/src/proxy.ts

@@ -2,9 +2,10 @@ import { NextResponse } from "next/server";
 import { clerkMiddleware, createRouteMatcher } from "@clerk/nextjs/server";
 
 import { isLikelyValidClerkPublishableKey } from "@/auth/clerkKey";
+import { AuthMode } from "@/auth/mode";
 
 const isClerkEnabled = () =>
-  process.env.NEXT_PUBLIC_AUTH_MODE !== "local" &&
+  process.env.NEXT_PUBLIC_AUTH_MODE !== AuthMode.Local &&
   isLikelyValidClerkPublishableKey(
     process.env.NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY,
   );