startLive()'s browser-engine branch flipped liveStatus to "listening" (the
red live-dot, "Listening..." hint) the instant the mic was granted, even if
the Whisper pipeline was still loading — the user saw an active-looking
session while nothing was being transcribed yet. transcribeLiveSegment()
already correctly awaits the model-ready gate before posting a segment, so
this was purely a misleading-status bug.
Adds a "loading-model" LiveStatus between "starting" and "listening";
startLive() now waits on the same browserModelReady() gate the transcribe
path uses before claiming "listening", with race-safe cleanup if the load
fails while waiting. Server-engine live is unaffected.
Adds Decisions.md D-034; updates tests/live.md's manual verification steps.
Transformers.js's progress_callback always fires status:"download" regardless
of whether the file is actually served from the Cache API — there's no
cacheHit signal for the worker to forward. Since App.tsx already tracks which
models are downloaded (for ModelPicker's badges), it now checks that before
starting a load and threads a loadedFromCache flag into ModelLoadProgress, so
the heading/hint reflect reality for the common already-cached case.
Adds Decisions.md D-033.
Lucas Winther