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/components/zipcode_table.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'dart:math' as math;
 import 'package:flutter/services.dart';
 import 'package:shadcn_ui/shadcn_ui.dart';
 import 'package:superport/data/models/zipcode_dto.dart';
@@ -9,6 +10,8 @@ class ZipcodeTable extends StatelessWidget {
   final int totalPages;
   final Function(int) onPageChanged;
   final Function(ZipcodeDto) onSelect;
+  // Optional: cap the effective viewport width used by the table
+  final double? maxWidthCap;
 
   const ZipcodeTable({
     super.key,
@@ -17,6 +20,7 @@ class ZipcodeTable extends StatelessWidget {
     required this.totalPages,
     required this.onPageChanged,
     required this.onSelect,
+    this.maxWidthCap,
   });
 
   void _copyToClipboard(BuildContext context, String text, String label) {
@@ -43,7 +47,13 @@ class ZipcodeTable extends StatelessWidget {
               builder: (context, constraints) {
                 // 고정폭 + 마지막 filler
                 const double minW = 160 + 180 + 180 + 320 + 140 + 24;
-                final double tableW = constraints.maxWidth >= minW ? constraints.maxWidth : minW;
+                final double viewportW = constraints.maxWidth.isFinite
+                    ? constraints.maxWidth
+                    : MediaQuery.sizeOf(context).width;
+                final double cappedW = maxWidthCap != null
+                    ? math.min(viewportW, maxWidthCap!)
+                    : viewportW;
+                final double tableW = cappedW >= minW ? cappedW : minW;
                 const double etcW = 320.0;
 
                 return SingleChildScrollView(