[v4] Inconsistent collapsible panel behavior

[Windmill-City]

Relates to #527

When starting from an uncollapsed state, collapsing and uncollapsing the sidebar (without releasing the resize handler) follows the expected halfway threshold concept. However, when starting from a collapsed state, the same doesn't hold true - the sidebar only expands once it reaches minSize.

https://codesandbox.io/p/devbox/react-resizable-panels-v4-bug-repro-forked-lwd53d

[bvaughn]

This is really difficult to get "right" and ultimately I don't know if it feels worth the effort on my side.

There are a lot of scenarios this library has to account for. Even in a two panel group, either (or both) panels can be collapsible, and resizing could be taking either panel into or out of a collapsed state.

[bvaughn]

This behavior has been improved in 4.5.3.

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