chore: document Flutter pre-commit checks

CLAUDE.md

@@ -6,6 +6,28 @@
 - All new feature development must be done on a `dev` branch, created from `master`
 - After verification, merge `dev` back into `master`
 
+## Pre-Commit Checks
+
+Before committing Flutter app changes, run these checks:
+
+```bash
+dart format --set-exit-if-changed .
+flutter analyze
+flutter test
+```
+
+If `flutter test` fails with a localhost WebSocket/proxy error, follow the proxy cleanup steps in the Flutter Test Rules section below and run it again.
+
+### Handling Check Failures
+
+- If a check fails because of the current change, fix the issue before committing.
+- If `flutter analyze` reports any issue in files changed by the current task, fix it before committing.
+- If `flutter analyze` reports only unrelated pre-existing issues, do not fix them in the current commit. Report the file, line, and lint/error name, then handle them in a separate cleanup commit or task.
+- If a check fails because of unrelated pre-existing issues, do not include unrelated fixes in the same commit. Report the failing command and the existing issues, then handle them in a separate cleanup commit or task.
+- If formatting fails, format only files changed by the current task. Do not run a broad formatting cleanup unless that is the explicit task.
+- Treat `flutter test` failures as blocking unless the failure is clearly caused by the proxy issue described below and passes after rerunning with proxy variables cleared.
+- When committing or reporting completion, mention which checks were run and whether any remaining failures are unrelated pre-existing issues.
+
 ## App Installation Rules
 
 **Always use `adb install -r` to install the app. Never use `flutter install`.**

lib/pages/registration/parts/registration_overview_part.dart

@@ -19,14 +19,6 @@ extension _RegistrationOverviewPart on _RegistrationPageState {
     );
   }
 
-  /// Whether any scanned item already has a location binding (on_shelf or transferred).
-  bool _hasAnyLocatedInScanned() {
-    return registration_calculations.hasAnyLocatedInScanned(
-      overview: _overview,
-      zongpaiNos: _zongpaiNos,
-    );
-  }
-
   Future<String?> _baseUrl() async {
     final configService = AppConfigService();
     final baseUrl = await configService.getString('api_url') ?? '';