feat(auth): implement session token creation and verification for enhanced security

feat(api): require session authentication for admin routes and improve error handling

fix(api): streamline project image generation by fetching data directly from the database

fix(api): optimize project import/export functionality with session validation and improved error handling

fix(api): enhance analytics dashboard and email manager with session token for admin requests

fix(components): improve loading states and dynamic imports for better user experience

chore(security): update Content Security Policy to avoid unsafe-eval in production

chore(deps): update package.json scripts for consistent environment handling in linting and testing

app/api/analytics/performance/route.ts

@@ -4,14 +4,11 @@ import { requireSessionAuth } from '@/lib/auth';
 
 export async function GET(request: NextRequest) {
   try {
-    // Check admin authentication - for admin dashboard requests, we trust the session
+    // Admin-only endpoint
     const isAdminRequest = request.headers.get('x-admin-request') === 'true';
-    if (!isAdminRequest) {
-      const authError = requireSessionAuth(request);
-      if (authError) {
-        return authError;
-      }
-    }
+    if (!isAdminRequest) return NextResponse.json({ error: 'Admin access required' }, { status: 403 });
+    const authError = requireSessionAuth(request);
+    if (authError) return authError;
 
     // Get performance data from database
     const pageViews = await prisma.pageView.findMany({