Uncaught DeveloperError: Expected Year to be greater than or equal to 1 - when zooming out timeline

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### What happened?

If you use the mouse wheel to zoom out a long way on the timeline (past when other centuries are visible), eventually the following error is produced:

Uncaught DeveloperError: Expected Year to be greater than or equal to 1, actual value was -160
Error
at new DeveloperError (https://sandcastle.cesium.com/js/engine/index.js:12353:11)
at Check.typeOf.number.greaterThanOrEquals (https://sandcastle.cesium.com/js/engine/index.js:12440:11)
at validateRange (https://sandcastle.cesium.com/js/engine/index.js:16789:33)
at GregorianDate (https://sandcastle.cesium.com/js/engine/index.js:16771:3)
at _JulianDate.toGregorianDate (https://sandcastle.cesium.com/js/engine/index.js:17377:14)
at Timeline._makeTics (https://sandcastle.cesium.com/js/widgets/index.js:11200:37)
at Timeline.zoomTo (https://sandcastle.cesium.com/js/widgets/index.js:11104:8)
at Timeline.zoomFrom (https://sandcastle.cesium.com/js/widgets/index.js:11125:8)
at HTMLDivElement. (https://sandcastle.cesium.com/js/widgets/index.js:11509:14) (on line 12440 of https://sandcastle.cesium.com/js/engine/index.js)

And it doesn't appear to be recoverable.

### Reproduction steps

1. Load any Sandcastle
2. Put cursor over timeline
3. Use mouse wheel to zoom out - keep going until you get the error (which is around when you can see other centuries)

### Sandcastle example

Any

### Environment

Browser: Edge
CesiumJS Version: 1.145.0
Operating System: Windows

### AI acknowledgment

- [ ] I used AI to generate this issue report.
- [ ] (If the above is checked) I have reviewed the AI-generated content before submitting.

Reproduce the issue by zooming out repeatedly over the timeline in any Sandcastle. Start at Timeline.zoomFrom and Timeline.zoomTo, then inspect Timeline._makeTics and its call to JulianDate.toGregorianDate, which reaches GregorianDate validation. Done means zooming out past other centuries no longer throws the reported negative-year error and the timeline remains usable.

Written by the indexing model from the issue text.