Potential experiments

fix(voice-menus): drive stream actions from the published source (#2396)

fix(voice-menus): sentence-case participant menu labels (#2395)

fix(voice): abort screen share when its audio cannot start (#2394)

feat(voice): skip the screen-share picker modal on web (#2393)

feat(voice): redesign the screen-share source picker (#2392)

feat(voice): sequence join chimes ahead of entrance sounds (#2391)

fix(voice): honour the codec preference in fallback selection (#2390)

fix(voice): guard stale screen-share negotiation and probes (#2389)

refactor(voice): bound the screen-share codec wire formats (#2388)

refactor(voice): request mic and camera permission separately (#2387)

fix(voice): log local voice state hydration failures (#2386)

refactor(voice): make screen-share source swaps atomic (#2385)

feat(voice): request web share audio via the browser picker (#2384)

fix(voice): refresh camera capture when the device changes (#2383)

fix(voice): polish the stream settings menu (#2382)

refactor(voice): pin screen share to a fixed 7 Mbps bitrate (#2381)

refactor(voice): clamp premium video quality at read time (#2380)

feat(voice): add screen-share audio and rollback error handling (#2379)

feat(voice): add the camera background effects pipeline (#2378)

feat(backgrounds): accept webm custom call backgrounds (#2377)