style: apply dart formatting fixes across lib/ and test/

11 files had formatting inconsistencies that caused the
--set-exit-if-changed gate to fail. Automated formatting
via dart format now passes cleanly.

test/time_formatter_test.dart

@@ -54,46 +54,51 @@ void main() {
 
     test('does not double-convert timestamps with explicit UTC designator', () {
       const String utcStamp = '2026-05-15T03:00:00Z';
-      final String expected = DateFormat('jm').format(DateTime.parse(utcStamp).toLocal());
+      final String expected = DateFormat(
+        'jm',
+      ).format(DateTime.parse(utcStamp).toLocal());
 
       expect(
-        formatStartingTime(
-          utcStamp,
-          sourceTimezone: 'America/Los_Angeles',
-        ),
+        formatStartingTime(utcStamp, sourceTimezone: 'America/Los_Angeles'),
         expected,
       );
     });
 
-    test('keeps wall-clock time when local matches source zone for naive input', () {
-      const String sourceTime = '2026-05-14 20:00:00';
-      const String sourceZone = 'America/Los_Angeles';
+    test(
+      'keeps wall-clock time when local matches source zone for naive input',
+      () {
+        const String sourceTime = '2026-05-14 20:00:00';
+        const String sourceZone = 'America/Los_Angeles';
 
-      final tz.TZDateTime source = tz.TZDateTime(
-        tz.getLocation(sourceZone),
-        2026,
-        5,
-        14,
-        20,
-      );
-      final String expected = DateFormat('jm').format(
-        DateTime.fromMillisecondsSinceEpoch(
-          source.millisecondsSinceEpoch,
-          isUtc: true,
-        ).toLocal(),
-      );
+        final tz.TZDateTime source = tz.TZDateTime(
+          tz.getLocation(sourceZone),
+          2026,
+          5,
+          14,
+          20,
+        );
+        final String expected = DateFormat('jm').format(
+          DateTime.fromMillisecondsSinceEpoch(
+            source.millisecondsSinceEpoch,
+            isUtc: true,
+          ).toLocal(),
+        );
 
-      expect(
-        formatStartingTime(sourceTime, sourceTimezone: sourceZone),
-        expected,
-      );
-    });
+        expect(
+          formatStartingTime(sourceTime, sourceTimezone: sourceZone),
+          expected,
+        );
+      },
+    );
   });
 
   group('formatTimeWindow', () {
     test('returns mm:ss style duration from server times', () {
       expect(
-        formatTimeWindow('2026-05-15 05:18:46.000000', '2026-05-15 05:23:21.000000'),
+        formatTimeWindow(
+          '2026-05-15 05:18:46.000000',
+          '2026-05-15 05:23:21.000000',
+        ),
         '04:35',
       );
     });