Potential experiments

fix(chat): slow-mode indicator reporting Fixes: #669

feat(app): resize the expression picker and snap to emoji columns (#1924)

Merge remote-tracking branch 'origin/canary' into canary

perf(app): preload picker images through the shared image cache (#1923)

fix(app): load expression grid images only when they scroll into view (#1922)

fix(app): stop the skin tone selector listening while closed (#1921)

fix(app): reserve emoji picker cells while their image loads (#1920)

fix(app): blur mature embed images and videos (#1919)

fix(app): blur mature embed images and videos

fix(app): load small list avatars eagerly (#1918)

fix(app): hide decorative country and region flags from screen readers (#1917)

fix(app): replace the whole +: token when picking a reaction emoji (#1916)

fix(app): keep composer markdown highlighting aligned on long messages (#1915)

fix(app): honour the animation setting for composer custom emoji (#1914)

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)