The terminal fix was only one instance. An audit of the other pane toggles
found ⌘G and ⌘J diverging the same way, proven with a probe: with review
stacked behind files in the right column, or either pane inside a minimized
zone, the store reads open while nothing is on screen, so the press
re-asserts a value it already held and the key does nothing.
isPaneVisible / togglePaneVisible replace the tool-panel-only pair and now
back every toggle. Close still routes through closeTreePane, so each pane
keeps its own semantics: a tool panel collapses to its rail, files and
review close through their store, anything else is dismissed.
files and review were bound with a closer and no opener, so the boolean went
stale as soon as anything but the toggle revealed them. bindPaneVisibility
moves into the tree store beside bindToolPaneCollapse, documents the two as a
pair, and both panes now pass both halves. Keeping the binding in the store
also means the tests drive the real function — the earlier copy in the test
file passed with the fix reverted, which is how the missing opener survived
the first pass.
setTreePaneHidden keeps its quiet path: a reactive unhide (a cwd arriving)
must not front or un-minimize over what the user is looking at. Only user
intent goes through the reveal path.
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