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);
                 },