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/inventory/inventory_dashboard.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:superport/screens/common/theme_shadcn.dart';
 import 'package:provider/provider.dart';
 import 'package:shadcn_ui/shadcn_ui.dart';
 import 'controllers/equipment_history_controller.dart';
@@ -172,7 +173,7 @@ class _InventoryDashboardState extends State<InventoryDashboard> {
                                         ),
                                         child: Text(
                                           history.transactionType == 'I' ? '입고' : '출고',
-                                          style: const TextStyle(color: Colors.white, fontSize: 12),
+                                          style: TextStyle(color: ShadcnTheme.primaryForeground, fontSize: 12),
                                           textAlign: TextAlign.center,
                                         ),
                                       ),
@@ -255,4 +256,4 @@ class _InventoryDashboardState extends State<InventoryDashboard> {
       ),
     );
   }
-}
+}