fix(zipcode): cap table width in dialog to half screen via optional maxWidthCap; pass 0.5 fraction when used in Company/Warehouse dialogs

- ZipcodeTable: add maxWidthCap and use min(viewport, cap) to compute width
- ZipcodeSearchScreen: allow tableMaxWidthFraction and forward to table
- Apply 0.5 in CompanyForm and WarehouseLocationForm dialogs

flutter analyze: 0 errors, warnings unaffected

lib/screens/zipcode/zipcode_search_screen.dart

@@ -8,7 +8,10 @@ import 'package:superport/screens/zipcode/components/zipcode_table.dart';
 
 class ZipcodeSearchScreen extends StatefulWidget {
   final Function(ZipcodeDto)? onSelect;
-  const ZipcodeSearchScreen({super.key, this.onSelect});
+  // When used in a dialog/popup, you can cap the table width
+  // by setting this fraction (0.0–1.0) of the screen width.
+  final double? tableMaxWidthFraction;
+  const ZipcodeSearchScreen({super.key, this.onSelect, this.tableMaxWidthFraction});
 
   @override
   State<ZipcodeSearchScreen> createState() => _ZipcodeSearchScreenState();
@@ -236,6 +239,9 @@ class _ZipcodeSearchScreenState extends State<ZipcodeSearchScreen> {
                                         _showSuccessToast('우편번호 ${zipcode.zipcode}를 선택했습니다');
                                       }
                                     },
+                                    maxWidthCap: widget.tableMaxWidthFraction != null
+                                        ? MediaQuery.sizeOf(context).width * widget.tableMaxWidthFraction!
+                                        : null,
                                   ),
                                 ),
                               ],
@@ -248,4 +254,4 @@ class _ZipcodeSearchScreenState extends State<ZipcodeSearchScreen> {
       },
     );
   }
-}
+}