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Using Javascript to read and recalculate sizing is prone to causing 'forced reflows', which are very expensive, especially on slower devices. This PR refactors the slide-in menus so that all of the height calculation is done using CSS. This is made possible by the new dvh (dynamic view height) units and env(safe-area-inset-bottom), both of which are supported on all of our target browsers. In tests on a moto g50, on a sidebar with 16 categories, 15 tags, and 2 chat channels, this improves the sidebar opening time by around 50ms (6%).