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1235f7fd2f
Three bugs in yesterday's STT addition:
1) **TDZ crash** — `sttSupported` referenced `isClient` before its const
declaration, throwing on setup and breaking the whole classroom page.
`sttSupported` is now a ref that's populated in `onMounted`.
2) **Spoken vs. written mismatch** — Whisper returns natural ATC speech
("runway two five right", "lufthansa three five niner"), but the
lesson fields hold the canonical written form ("25R", "DLH359"). The
old `normalized.includes(...)` check never matched. Matching now lives
in `shared/utils/sttMatch.ts` and searches both the raw normalized
transcription *and* a denormalized projection that folds spoken
digits/letters back to written tokens (incl. SID suffix `7S`, runway
`25R`, scale words `five thousand → 5000`, frequency `decimal` as a
digit-run boundary).
3) **SSR hydration mismatch** — `sttSupported` evaluated differently on
server vs. client, causing visible-vs-hidden button divergence on
hydration. The ref-set-on-mount approach resolves it.
The new helper is fully unit-tested (15 cases covering radio check,
departure clearance, SIDs, squawks, Speedbird telephony, decimal
frequencies and edge cases).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>