Potential experiments

fix(app): fade image embed placeholders out instead of images in (#1891)

feat(app): suggest recent speakers and stop autocomplete list flicker (#1890)

fix(app): label pending composer attachments for screen readers (#1889)

fix(app): request attachment images at their real mosaic tile size (#1888)

feat(app): render search filters as inline tokens you can type through (#1887)

feat(app): keep search history per conversation and allow in: in DMs (#1886)

feat(app): keep search history per conversation and allow in: in DMs

fix(app): open channels at the unread divider and settle jump scrolling (#1885)

fix(api): distinguish a deleted reply target from no reply (#1884)

fix(app): animate reaction emoji only while hovering them (#1883)

perf(app): preload reaction menu emoji at the size they render (#1882)

perf(app): preload reaction menu emoji at the size they render

fix(app): stop the quick switcher list rebuilding while you navigate (#1881)

perf(app): load the keyboard mode intro modal only when it is shown (#1880)

fix(app): show the server avatar on message notifications (#1879)

fix(app): order member mention results by search relevance (#1878)

perf(app): play gif embeds from the viewport not a js decoder (#1877)

feat(app): warm full-size media while hovering an attachment (#1876)

fix(app): stop overlaying a sharpening canvas in the media viewer (#1875)

fix(app): stop seeking and hidden tabs from stranding playback (#1874)