test(claude): cover remove-nonexistent + list live-update for the 95% margin

Two more real branches the account feature left uncovered: removing an
unregistered account (the no-such-account error) and the registry list
rebuilding when a CLI-side registration notifies the shared settings store.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

test/builtin/claude/account_settings_control_test.dart

@@ -114,13 +114,18 @@ void main() {
     expect(find.text('Add account'), findsOneWidget);
   });
 
-  testWidgets('registry list: renders each account name + dir', (tester) async {
+  testWidgets('registry list: renders each account name + dir, and live-updates on a CLI add', (tester) async {
     final reg = AccountRegistry(f.services.settings);
     await tester.runAsync(() => reg.registerAccount('work', '/home/u/.claude-work'));
     await pumpList(tester);
     await tester.pump();
     expect(find.text('work'), findsOneWidget);
     expect(find.text('/home/u/.claude-work'), findsOneWidget);
+
+    // A CLI-side registration notifies the shared store → the list rebuilds.
+    await tester.runAsync(() => reg.registerAccount('personal', '/home/u/.claude-personal'));
+    await tester.pump();
+    expect(find.text('personal'), findsOneWidget);
   });
 
   testWidgets('registry list: typing a name + Add registers it and publishes login', (tester) async {

test/daemon/claude_account_commands_test.dart

@@ -140,6 +140,13 @@ void main() {
     expect(published.single.data, {'action': 'login', 'name': 'work', 'dir': '/home/u/.claude-work'});
   });
 
+  test('remove of an unregistered account → no-such-account error', () async {
+    wire();
+    final r = await run(['remove', 'ghost']);
+    expect(r.ok, isFalse);
+    expect(r.error?.message, contains('no such account'));
+  });
+
   test('set/unset with no workspace open error clearly', () async {
     wire(cwd: null);
     final set = await run(['set', 'work']);