Potential experiments

fix(app): keep the character counter inside the composer box (#1913)

fix(app): honour motion settings in composer autocomplete previews (#1912)

fix(app): reuse highlighted code instead of flashing plain text (#1911)

fix(app): let custom branding override the built-in meta description (#1910)

fix(app): show a still ban image under reduced motion or data saver (#1909)

fix(app): keep avatar stack entries keyed by user across re-renders (#1908)

fix(app): keep avatar stack entries keyed by user across re-renders

fix(app): show cached auth splash art without a fade-in flash (#1907)

perf(app): keep gateway and layer manager off the auth session path (#1906)

fix(app): size auth entity icons to their reserved box (#1905)

fix(app): keep paging when the jumped-to message is missing (#1904)

fix(app): drive the message list window from one load state machine (#1903)

perf(app): window sticker picker rows by offset instead of observers (#1902)

fix(app): tell the user when a search query has nothing to search (#1901)

perf(app): load sheet and popout media against their own scrollers (#1900)

fix(app): only track hover on reactions that have an animated emoji (#1899)

fix(app): stop pickers re-slicing their grid on first paint (#1898)

fix(app): stop rewriting message emoji urls to toggle animation (#1897)

fix(app): stop rewriting message emoji urls to toggle animation

perf(app): show the message action bar from css not remounting (#1896)