Potential experiments

fix(app): use guild initials for community picker rows (#1930)

perf(app): stop loading the animated guild banner where it is hidden (#1929)

perf(app): stop loading the animated guild banner where it is hidden

perf(app): reuse pooled gif videos instead of caching blobs (#1928)

fix(app): pick gif picker previews by format and skip empty sources (#1927)

fix(app): keep a child's own data-flx when wrapped in a focus ring (#1926)

fix(app): refresh favorite gif previews that point at a provider page (#1925)

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)