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

__tests__/ui-features.test.ts

@@ -46,21 +46,18 @@ describe('UI Features Tests', () => {
   it('should have predefined material options', () => {
     const adminDashboardPath = join(process.cwd(), 'app', 'dashboard', 'page.tsx');
     const adminContent = readFileSync(adminDashboardPath, 'utf-8');
-    
-    // Check for material select dropdown
-    expect(adminContent).toContain('<option value="PLA">PLA</option>');
-    expect(adminContent).toContain('<option value="PETG">PETG</option>');
-    expect(adminContent).toContain('<option value="ABS">ABS</option>');
+
+    // Check for material select dropdown (now generated from catalog)
+    expect(adminContent).toContain('getMaterialOptions()');
+    expect(adminContent).toContain('Izaberi tip');
   });
 
-  it('should have admin header with navigation', () => {
+  it('should have admin sidebar and header', () => {
     const adminDashboardPath = join(process.cwd(), 'app', 'dashboard', 'page.tsx');
-
     const dashboardContent = readFileSync(adminDashboardPath, 'utf-8');
-    
-    // Check for admin header
-    expect(dashboardContent).toContain('Admin');
-    expect(dashboardContent).toContain('Nazad na sajt');
+
+    // Check for admin sidebar and header
+    expect(dashboardContent).toContain('AdminSidebar');
     expect(dashboardContent).toContain('Odjava');
   });