The Strike cell becomes a dropdown of available strikes (for that leg's
symbol+expiry+type) drawn from the cached chain — seeded from chain.html's
last-loaded chain (localStorage) and refreshed by the strategy page's own
per-expiry chain fetch on open / Reload. Picking a new strike updates the
leg's entry price, IV and mark from that contract and clears the lock.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
ojy
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