feat: add service window component and related functionality

- Introduced ServiceWindow component to display the last departure today and the first tomorrow.
- Implemented cancellation notice parsing to handle route cancellations effectively.
- Enhanced departure display logic to include cancellation alerts and status updates.
- Created information blocks for displaying service information, weather, and QR codes.
- Added tests for departure features, information handling, and service window functionality.
- Updated fixtures for testing various scenarios including cancellations and long wait times.

test/board.test.mjs

@@ -85,6 +85,14 @@ test('city and platform identity are checked before restoring a snapshot', () =>
   assert.equal(isBoardData(data, 1, 2), false);
   assert.equal(isBoardData({ ...data, mode: 'demo' }, 1, 1), false);
 });
+test('malformed cancellation targets in a saved snapshot are rejected instead of cancelling unrelated trips', () => {
+  const target = { routeNumber: '5', stopId: 1, serviceDate: '2026-10-08', time: '12:35' };
+  const alert = { id: '1', routeIds: [37], routeNumbers: ['5'], cancellations: [target] };
+  const snapshot = { ...makeSnapshot(), alerts: [alert] };
+  assert.equal(isBoardData(snapshot, 1, 1), true);
+  for (const damaged of [null, { ...target, stopId: -1 }, { ...target, serviceDate: '2026-02-31' }, { ...target, time: '25:00' }])
+    assert.equal(isBoardData({ ...snapshot, alerts: [{ ...alert, cancellations: [damaged] }] }, 1, 1), false);
+});
 test('route filtering and transport priority use absolute arrival time', () => {
   const data = makeSnapshot();
   assert.equal(upcomingDepartures(data, now, '88').length, 0);