chore(zipcode): remove copy icons and clipboard helpers; cap dialog width to 33% of screen

- Remove copy buttons in ZipcodeTable (zipcode and full address)
- Drop unused clipboard helper and import
- Use tableMaxWidthFraction: 0.33 in Company/Warehouse zipcode dialogs

lib/screens/company/company_form.dart

@@ -109,7 +109,7 @@ _controller = CompanyFormController(
                 GetIt.instance<ZipcodeUseCase>(),
               ),
               child: ZipcodeSearchScreen(
-                tableMaxWidthFraction: 0.5,
+                tableMaxWidthFraction: 0.33,
                 onSelect: (zipcode) {
                   Navigator.of(dialogContext).pop(zipcode);
                 },

lib/screens/warehouse_location/warehouse_location_form.dart

@@ -80,7 +80,7 @@ class _WarehouseLocationFormScreenState
                 GetIt.instance<ZipcodeUseCase>(),
               ),
               child: ZipcodeSearchScreen(
-                tableMaxWidthFraction: 0.5,
+                tableMaxWidthFraction: 0.33,
                 onSelect: (zipcode) {
                   Navigator.of(dialogContext).pop(zipcode);
                 },

lib/screens/zipcode/components/zipcode_table.dart

@@ -1,6 +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';
 
@@ -23,17 +22,7 @@ class ZipcodeTable extends StatelessWidget {
     this.maxWidthCap,
   });
 
-  void _copyToClipboard(BuildContext context, String text, String label) {
-    Clipboard.setData(ClipboardData(text: text));
-    
-    ShadToaster.of(context).show(
-      ShadToast(
-        title: Text('$label 복사됨'),
-        description: Text(text),
-        duration: const Duration(seconds: 2),
-      ),
-    );
-  }
+  // copy helpers removed per UX request (no copy icons in popup)
 
   @override
   Widget build(BuildContext context) {
@@ -114,12 +103,7 @@ class ZipcodeTable extends StatelessWidget {
                                     ),
                                   ),
                                 ),
-                                const SizedBox(width: 8),
-                                ShadButton.ghost(
-                                  onPressed: () => _copyToClipboard(context, zipcode.zipcode.toString().padLeft(5, '0'), '우편번호'),
-                                  size: ShadButtonSize.sm,
-                                  child: Icon(Icons.copy, size: 14, color: theme.colorScheme.mutedForeground),
-                                ),
+                                // copy icon removed per spec
                               ],
                             ),
                           ),
@@ -149,17 +133,7 @@ class ZipcodeTable extends StatelessWidget {
                           ShadTableCell(
                             child: SizedBox(
                               width: etcW,
-                              child: Row(
-                                children: [
-                                  Expanded(child: Text(zipcode.etc, overflow: TextOverflow.ellipsis, style: TextStyle(color: theme.colorScheme.foreground))),
-                                  const SizedBox(width: 8),
-                                  ShadButton.ghost(
-                                    onPressed: () => _copyToClipboard(context, zipcode.fullAddress, '전체주소'),
-                                    size: ShadButtonSize.sm,
-                                    child: Icon(Icons.copy, size: 14, color: theme.colorScheme.mutedForeground),
-                                  ),
-                                ],
-                              ),
+                              child: Text(zipcode.etc, overflow: TextOverflow.ellipsis, style: TextStyle(color: theme.colorScheme.foreground)),
                             ),
                           ),
                           // 작업