Fix timepanel size being rounded down

[IsseW]

Related

• Closes RR-3174

What

Fixes time panel size being rounded down when dragging it.

[github-actions]

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Result	Commit	Link	Manifest
✅	af0cb53	https://rerun.io/viewer/pr/12208	+nightly +main

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[emilk]

Small fix! Would .round() make even more sense?

[IsseW]

Small fix! Would .round() make even more sense?

Good point, yeah I think so.

Also realized that this issue goes a bit further. Since we, in blueprint, store the x axis view with integers it gets buggy for small views. Especially with sequence timelines. So I added a temporary float value for the offset in the x axis that gets stored in egui memory.