Potential experiments

fix(app): stop refetching profile art when menus appear (#1954)

fix(app): let the profile popout banner fill its header (#1953)

fix(app): stop rewriting profile bio emoji urls on hover (#1952)

fix(app): version profile badge assets so they refresh (#1951)

fix(app): stop premium upsell preview emoji from stretching (#1950)

fix(app): remove popout stylesheets when the main document drops them (#1949)

fix(app): remove popout stylesheets when the main document drops them

feat(app): let the pinned messages popout be resized (#1948)

perf(app): recompute picker grid layout in scroll chunks (#1947)

fix(app): fade the picker thumbhash out instead of fading images in (#1946)

fix(app): fit media to its real box and gate the zoom buttons (#1945)

fix(app): rank permission override member search by the worker order (#1944)

fix(app): add a quick modal motion preset and settle instant modals (#1943)

fix(app): honour motion settings in the mobile meme picker (#1942)

fix(app): show message actions only on keyboard focus (#1941)

perf(app): stop redundant member list presence updates (#1940)

fix(app): track member list width with a media query (#1939)

perf(app): redraw the media timestamp only when the second changes (#1938)

fix(app): leave fullscreen when the video player unmounts (#1937)

perf(app): reuse parsed markdown across message renders (#1936)