Add MasterBus component + enhance BusStrip with routing selector

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.
This commit is contained in:
2026-06-23 12:15:09 -04:00
parent 17d423b21f
commit d19e0ea7a8
25 changed files with 4419 additions and 288 deletions
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