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/company/branch_form.dart

@@ -376,7 +376,7 @@ class _BranchFormScreenState extends State<BranchFormScreen> {
                         onPressed: controller.isSaving ? null : _saveBranch,
                         style: ElevatedButton.styleFrom(
                           backgroundColor: ShadcnTheme.primary,
-                          foregroundColor: Colors.white,
+                          foregroundColor: ShadcnTheme.primaryForeground,
                           minimumSize: const Size.fromHeight(48),
                           shape: RoundedRectangleBorder(
                             borderRadius: BorderRadius.circular(8),
@@ -387,7 +387,7 @@ class _BranchFormScreenState extends State<BranchFormScreen> {
                                 height: 20,
                                 width: 20,
                                 child: CircularProgressIndicator(
-                                  valueColor: AlwaysStoppedAnimation<Color>(Colors.white),
+                                  valueColor: AlwaysStoppedAnimation<Color>(ShadcnTheme.primaryForeground),
                                   strokeWidth: 2,
                                 ),
                               )
@@ -411,4 +411,4 @@ class _BranchFormScreenState extends State<BranchFormScreen> {
       ),
     );
   }
-}
+}