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/widgets/shadcn/shad_table.dart

@@ -188,10 +188,18 @@ class _SuperportShadTableState<T> extends State<SuperportShadTable<T>> {
           padding: EdgeInsets.zero,
           child: Column(
             children: [
-              SingleChildScrollView(
-                controller: _scrollController,
-                scrollDirection: Axis.horizontal,
-                child: DataTable(
+              // 테이블이 가용 너비를 최소한으로 채우되, 컬럼이 더 넓으면 수평 스크롤 허용
+              LayoutBuilder(
+                builder: (context, constraints) {
+                  return SingleChildScrollView(
+                    controller: _scrollController,
+                    scrollDirection: Axis.horizontal,
+                    child: ConstrainedBox(
+                      constraints: BoxConstraints(
+                        // viewport(=부모)의 가로폭만큼은 항상 채움
+                        minWidth: constraints.maxWidth,
+                      ),
+                      child: DataTable(
                   columns: [
                     if (widget.showCheckbox)
                       DataColumn(
@@ -304,7 +312,10 @@ class _SuperportShadTableState<T> extends State<SuperportShadTable<T>> {
                       ],
                     );
                   }).toList(),
-                ),
+                      ),
+                    ),
+                  );
+                },
               ),
               if (_totalPages > 1) ...[
                 const Divider(height: 1),
@@ -383,4 +394,4 @@ class ShadTableColumn<T> {
     this.width,
     this.sortable = true,
   });
-}
+}