Adds a "Screen sharing" section to Settings > Video with controls for:
- Resolution (576p to 4K)
- Framerate (5-60 fps slider)
- Bitrate (0.5-15 Mbps slider)
- Codec (VP8/VP9/H.264/AV1)
Gated behind an "Advanced screen share settings" toggle. When enabled,
settings are passed to LiveKit's setScreenShareEnabled as both capture
constraints and publish options. When disabled, falls back to
config.json media_quality defaults.
Settings are persisted in localStorage via the existing Setting<T>
system. The Slider component is extended with a tooltipFormatter prop
for custom tooltip display.
Inspired by pirosuki's advanced-screen-share-settings branch, but
reimplemented cleanly: settings are read directly in LocalMember.ts
(no signature changes), the existing Slider is extended (no component
duplication), and proper form components are used throughout.
Signed-off-by: Ryan Emmick <ryanemmick4@gmail.com>