Fix problem with Variables Pane group/sort menu buttons by tracking state

[juliasilge]

Addresses #8921

Claude Code and I wrote this together, and I do think I learned a lot from experimenting in a part of the code base I am less familiar with. We were setting checked on all these actions for the context menus, but we were not tracking the state in any way; it never re-rendered those check marks in the context menu.

@:variables

Release Notes

New Features

• N/A

Bug Fixes

• Fixed state management for checkmarks in Variables pane context menus for sorting and grouping.

QA Notes

• Run some code like this so you have a collection of objects in the Variables Pane:

x <- rep("", 10)

for (i in 1:10) {
  x[i] <- paste("Howdy!", paste0(rep("🤠", i), collapse = ""))
}

y <- ggplot2::diamonds

aa <- function(formula) {
  lm(formula, data = mtcars)
}

bb <- function(foo) {
  summary(aa(foo))
}

• By default the objects are grouped by "Kind" and sorted by "Name"
• Change the grouping and confirm that the check updates in the context menu
• Change the sorting and confirm the check updates in that context menu as well
• You should be able to switch back and forth between all the options in both context menus
• You should also be able to toggle the "Highlight recent values" option

[dhruvisompura]

This looks good to me and worked as expected!