TimeZoom's _ScrollPositionWithSingleContext doesn't support pointerScroll

[abel-123]

Describe the bug
When trying to scroll with the mouse wheel on desktop (flutter web), timetable does not scroll and throws an error.

======== Exception caught by gesture library===============
The following UnsupportedError was thrown while resolving a PointerSignalEvent:
Unsupported operation: TimeZoom's _ScrollPositionWithSingleContext doesn't support pointerScroll.
When the exception was thrown, this was the stack:
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49 throw
packages/timetable/src/time/zoom.dart 809:5 pointerScroll
packages/flutter/src/widgets/scrollable.dart 717:16 [_handlePointerScroll]
packages/flutter/src/gestures/pointer_signal_resolver.dart 88:7 resolve
packages/flutter/src/gestures/binding.dart 445:29 handleEvent
packages/flutter/src/gestures/binding.dart 419:14 dispatchEvent
packages/flutter/src/rendering/binding.dart 322:11 dispatchEvent
packages/flutter/src/gestures/binding.dart 374:7 [_handlePointerEventImmediately]
packages/flutter/src/gestures/binding.dart 338:5 handlePointerEvent
packages/flutter/src/gestures/binding.dart 296:7 [_flushPointerEventQueue]
packages/flutter/src/gestures/binding.dart 279:32 [_handlePointerDataPacket]
C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/platform_dispatcher.dart 1020:13 invoke1
C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/platform_dispatcher.dart 184:5 invokeOnPointerDataPacket
C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/pointer_binding.dart 130:39 [_onPointerData]
C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/pointer_binding.dart 310:14 [_handleWheelEvent]
C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/pointer_binding.dart 574:7
C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/pointer_binding.dart 290:87
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 334:14 _checkAndCall
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 339:39 dcall
Event: _TransformedPointerScrollEvent#9dbd4(position: Offset(827.0, 649.0), scrollDelta: Offset(-0.0, 100.0))
position: Offset(827.0, 649.0)
scrollDelta: Offset(-0.0, 100.0)
============================================================

Environment:

• OS version: Windows 11
• Flutter version: e.g. 2.8.1
• Package version: 1.0.0-alpha.6

[JonasWanke]

Fixed and published as part of v1.0.0-alpha.7 (1a286f2)