- App.tsx: Import and render MetersPage when 'Meters' button toggled;
add Meters button to header between Patch and PiPedal buttons
- useMixerDaemon.ts: Add gateOpen and compressorReduction fields to
MixerChannel interface
- MetersPage.tsx: Add gate open/closed indicator (green/red G badge)
and compressor gain reduction bar to ChannelMeterTile
- MetersPage.css: Add gate indicator and compressor GR track styles
MasterBus: stereo master fader, mute, level meters in PiPedal theme
(purple accent per mixer-engine branch reference).
BusStrip: added per-channel routing selector (ch1Route..ch8Route)
for selecting output bus target (Main, Bus 2-8).
MixerPage: integrated MasterBus with levels derived from bus
master data. Local state for volume/mute until backend exposes
master output.
shawn