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).

test/integration/auth_flow_integration_test.dart

@@ -3,7 +3,12 @@ import 'dart:io';
 import 'package:dio/dio.dart';
 import 'package:flutter_test/flutter_test.dart';
 
+const bool RUN_EXTERNAL_TESTS = bool.fromEnvironment('RUN_EXTERNAL_TESTS');
 void main() {
+  if (!RUN_EXTERNAL_TESTS) {
+    test('External tests disabled', () {}, skip: 'Enable with --dart-define=RUN_EXTERNAL_TESTS=true');
+    return;
+  }
   final baseUrl = Platform.environment['INTEGRATION_API_BASE_URL'];
   final username = Platform.environment['INTEGRATION_LOGIN_USERNAME'];
   final password = Platform.environment['INTEGRATION_LOGIN_PASSWORD'];
@@ -38,4 +43,3 @@ void main() {
     }, tags: ['integration']);
   });
 }
-