Align catalog with Bambu Lab product line, add conditional filters and admin sidebar

- Add master catalog (bambuLabCatalog.ts) as single source of truth for materials, finishes, colors, and refill/spool availability
- Fix incorrect finish-per-material mappings (remove PLA: 85A/90A/95A HF/FR/GF/HF, add ASA: Basic/CF/Aero, fix PETG/PC)
- Implement cascading filters on public site: material restricts finish, finish restricts color
- Add AdminSidebar component across all admin pages
- Redirect /upadaj to /dashboard when already authenticated
- Update color hex mappings and tests to match official Bambu Lab names

app/upadaj/requests/page.tsx

@@ -4,6 +4,7 @@ import React, { useState, useEffect } from 'react';
 import { useRouter } from 'next/navigation';
 import { colorRequestService } from '@/src/services/api';
 import Link from 'next/link';
+import { AdminSidebar } from '@/src/components/AdminSidebar';
 
 interface ColorRequest {
   id: string;
@@ -120,16 +121,11 @@ export default function ColorRequestsAdmin() {
 
   return (
     <div className="min-h-screen bg-gray-50 dark:bg-gray-900">
-      <div className="container mx-auto px-4 py-8">
+      <div className="flex">
+        <AdminSidebar />
+        <div className="flex-1 p-8">
         <div className="flex justify-between items-center mb-6">
           <h1 className="text-3xl font-bold text-gray-800 dark:text-gray-100">Zahtevi za Boje</h1>
-          <div className="space-x-4 flex flex-wrap gap-2">
-            <Link href="/dashboard" className="px-4 py-2 bg-gray-600 text-white rounded hover:bg-gray-700">Inventar</Link>
-            <Link href="/upadaj/colors" className="px-4 py-2 bg-gray-600 text-white rounded hover:bg-gray-700">Boje</Link>
-            <Link href="/upadaj/sales" className="px-4 py-2 bg-gray-600 text-white rounded hover:bg-gray-700">Prodaja</Link>
-            <Link href="/upadaj/customers" className="px-4 py-2 bg-gray-600 text-white rounded hover:bg-gray-700">Kupci</Link>
-            <Link href="/upadaj/analytics" className="px-4 py-2 bg-gray-600 text-white rounded hover:bg-gray-700">Analitika</Link>
-          </div>
         </div>
 
         {error && (
@@ -347,6 +343,7 @@ export default function ColorRequestsAdmin() {
             </div>
           </div>
         </div>
+        </div>
       </div>
     </div>
   );