Data Explorer: Hide Summary panel on open if it would take up > 50% of the view

[jmcphers]

During Posit Conf, I observed a lot of teachers (and students) using RStudio's data viewer with pretty high zoom levels or small windows. When Positron's window is similarly small (or zoom level is high), the Data Explorer's summary view crowds out or completely hides the data itself.

Here, you can see that at default widths we show less than two columns of the Diamonds data set, but still have a lot of dead space in the Summary.

I'd propose that we should prioritize the data itself at smaller resolutions and should collapse the summary view by default when the editor panel is so narrow that we'd be showing more summary than data.

Related to #2823.

[jthomasmock]

Putting this in future, but I think our work in #2823 will make this better and we'll evaluate "closed on open" based on user feedback.

[kv9898]

Putting this in future, but I think our work in #2823 will make this better and we'll evaluate "closed on open" based on user feedback.

Another vote for "closed on open".

[testlabauto]

Verified Fixed

Positron Version(s) : 2025.09.0-41
OS Version          : OSX

Test scenario(s)

Summary panel hidden on data explorer open if would take up more than 50% of the view.

Link(s) to TestRail test cases run or created: