[Kickoff] Revamp LeaveButtons item
* Simplify to be a `Repeater` in a `ColumnLayout` * Popuplate context menu with an `Instantiator` with `MenuItem` as delegate * Elide power buttons if necessary (previously they would just be cut off/fall off the view) * Position context menu below/above the leave button * Make leave button "pressed" while the menu is open
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62503e21