The window fits the room it has, at any zoom
Panes fold into drawers in a fixed order, the title drops detail before it crowds the controls, and the terminal stacks when narrow, at every zoom.
As the window narrows, the sidebar folds into a drawer first, then the session panel, then the inspector. The chat always keeps room to read and type.
The title at the top keeps the place name and lets the open item go before it would run into the buttons on either side.
The terminal stands beside the page when there is room and slides underneath when there is not, and the place switcher tightens on a small window. All of it now measures the real space, so it behaves the same at 75% and 150% zoom.