The moment the VIN reaches 17 valid chars, warm the full decode in the background
(350ms debounce, deduped per VIN, fire-and-forget) so the "Şase Çöz" click hits
the backend lock / 24h positive cache and returns near-instantly. If the warm is
still in flight when the dealer clicks, the button's decode lock-waits on it and
navigates the moment it lands.
No analytics/state/navigation from the pre-decode — vin_decoded and the
success/candidates/error events still fire only from the button path, so the CRO
funnel stays = real intent. Raw fetch + AbortController (api.post takes no signal),
mirroring the existing 17-char preview effect.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Semih Yesilyurt
c2960013f0