* Space the collapsed space panel separator away from the macOS traffic lights
On macOS the frameless window draws the traffic light buttons over the top
of the space panel. The cluster is inset 9px and is roughly 52px wide, so it
ends about 61px from the window edge. The collapsed space panel is 68px wide,
which left its right-hand separator crowding the green button.
Widen the collapsed panel to 76px on macOS so the separator gets about 15px
of clearance, in line with the compound 4x spacing step. The rule is added to
the styling already injected for the macOS title bar, so it only affects the
desktop app on macOS and is removed in full screen along with the rest.
Fixes https://github.com/element-hq/element-web/issues/32012
Notes: Fix the collapsed space panel separator sitting too close to the macOS traffic light buttons.
* Use contributor copyright header on the new test file
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