refactor: Improve authentication handling and cookie management

- Updated `proxy.ts` to simplify cookie name handling in `getToken`, allowing automatic detection of secure cookie prefixes.
- Refactored `auth.ts` to implement a lazy check for `NEXTAUTH_SECRET`, ensuring validation only occurs when necessary and preventing build-time errors.

lib/auth.ts

@@ -4,9 +4,20 @@ import { prisma } from "./prisma"
 import bcrypt from "bcryptjs"
 import { logger } from "./logger"
 
-const nextAuthSecret = process.env.NEXTAUTH_SECRET
+// Lazy check for NEXTAUTH_SECRET - only validate when actually needed
-if (!nextAuthSecret) {
+// This prevents build-time errors when the secret isn't available
+function getNextAuthSecret(): string {
+  const secret = process.env.NEXTAUTH_SECRET
+  if (!secret) {
+    // Only throw in non-build contexts (runtime)
+    // During build, Next.js might not have env vars available
+    if (process.env.NEXT_PHASE !== "phase-production-build") {
       throw new Error("NEXTAUTH_SECRET is not set. Define it to enable authentication.")
+    }
+    // Return a placeholder during build - will fail at runtime if not set
+    return "build-time-placeholder"
+  }
+  return secret
 }
 
 // Determine if we should use secure cookies based on AUTH_URL/NEXTAUTH_URL
@@ -155,5 +166,5 @@ export const { handlers, auth, signIn, signOut } = NextAuth({
         },
       }
     : undefined, // Let Auth.js defaults handle HTTPS envs (prefixes + Secure)
-  secret: nextAuthSecret,
+  secret: getNextAuthSecret(),
 })

proxy.ts

@@ -1,7 +1,6 @@
 import { NextResponse } from "next/server"
 import type { NextRequest } from "next/server"
 import { getToken } from "next-auth/jwt"
-import { SESSION_COOKIE_NAME } from "./lib/constants"
 import { logActivity } from "./lib/activity-log"
 
 export async function proxy(request: NextRequest) {
@@ -13,11 +12,13 @@ export async function proxy(request: NextRequest) {
   }
 
   // Get token (works in Edge runtime)
-  // Use constant for cookie name to match NextAuth config
+  // For HTTPS, NextAuth adds __Secure- prefix automatically
+  // Don't specify cookieName - let getToken auto-detect the correct cookie name
+  // It will automatically look for both prefixed and non-prefixed versions
   const token = await getToken({ 
     req: request,
     secret: process.env.NEXTAUTH_SECRET,
-    cookieName: SESSION_COOKIE_NAME
+    // Don't specify cookieName - getToken will auto-detect __Secure- prefix for HTTPS
   })
   
   // User activity logging - track all page visits and API calls