The initial-plan textarea gated duplicate createPlanningDraft calls only
on draftSessionIdRef, which is populated after the create round-trip
resolves. Keystrokes arriving while a create was in flight each passed the
guard and spawned a fresh draft. Add a synchronous draftCreateInFlightRef
sentinel that suppresses concurrent creates and clears on failure so a
later keystroke can retry. Includes an in-flight-concurrency regression test.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
074462eade