feat(ui): full‑width ShadTable across app; fix rent dialog width; correct equipment pagination

- ShadTable: ensure full-width via LayoutBuilder+ConstrainedBox minWidth
- BaseListScreen: default data area padding = 0 for table edge-to-edge
- Vendor/Model/User/Company/Inventory/Zipcode: set columnSpanExtent per column
  and add final filler column to absorb remaining width; pin date/status/actions
  widths; ensure date text is single-line
- Equipment: unify card/border style; define fixed column widths + filler;
  increase checkbox column to 56px to avoid overflow
- Rent list: migrate to ShadTable.list with fixed widths + filler column
- Rent form dialog: prevent infinite width by bounding ShadProgress with
  SizedBox and remove Expanded from option rows; add safe selectedOptionBuilder
- Admin list: fix const with non-const argument in table column extents
- Services/Controller: remove hardcoded perPage=10; use BaseListController
  perPage; trust server meta (total/totalPages) in equipment pagination
- widgets/shad_table: ConstrainedBox(minWidth=viewport) so table stretches

Run: flutter analyze → 0 errors (warnings remain).

lib/screens/common/app_layout.dart

@@ -52,7 +52,7 @@ class _AppLayoutState extends State<AppLayout>
   static const double _sidebarExpandedWidth = 260.0;
   static const double _sidebarCollapsedWidth = 72.0;
   static const double _headerHeight = 64.0;
-  static const double _maxContentWidth = 1440.0;
+  static const double _maxContentWidth = 1600.0;
 
   @override
   void initState() {
@@ -313,8 +313,9 @@ class _AppLayoutState extends State<AppLayout>
                   Expanded(
                     child: Center(
                       child: Container(
-                        constraints: BoxConstraints(
-                          maxWidth: isWideScreen ? _maxContentWidth : double.infinity,
+                        // 최대 폭 제한을 해제하여(=무한대) 사이드바를 제외한 남은 전폭을 모두 사용
+                        constraints: const BoxConstraints(
+                          maxWidth: double.infinity,
                         ),
                         padding: EdgeInsets.all(
                           isWideScreen ? ShadcnTheme.spacing6 : ShadcnTheme.spacing4
@@ -1267,13 +1268,13 @@ class SidebarMenu extends StatelessWidget {
                           vertical: 2,
                     ),
                     decoration: BoxDecoration(
-                      color: Colors.orange,
+                      color: ShadcnTheme.warning,
                       borderRadius: BorderRadius.circular(10),
                     ),
                     child: Text(
                       badge,
                       style: ShadcnTheme.caption.copyWith(
-                        color: Colors.white,
+                        color: ShadcnTheme.primaryForeground,
                         fontWeight: FontWeight.w600,
                       ),
                     ),
@@ -1390,4 +1391,4 @@ class SidebarMenu extends StatelessWidget {
         return outlinedIcon;
     }
   }
-}
+}