style(test): dart format settings + keymap category tests

Reflow lines `dart format` collapses — the T-451/T-452 test additions were
committed before `make format` ran, so the committed copies were unformatted.
No behavior change; keeps the push format gate green.

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

test/builtin/settings_ui/category_view_test.dart

@@ -132,7 +132,10 @@ void main() {
                 label: 'Preset',
                 defaultValue: 'default',
                 applyCommandPrefix: 'test.apply.',
-                options: [SettingsOption(value: 'default', label: 'Default'), SettingsOption(value: 'vim', label: 'Vim')],
+                options: [
+                  SettingsOption(value: 'default', label: 'Default'),
+                  SettingsOption(value: 'vim', label: 'Vim'),
+                ],
               ),
             ],
           ),