Collapse rapid double-submits into a single in-flight request across
admin-web, ops-web and the desktop client so users cannot fire parallel
login attempts and trip the new in-progress guard. Map the new
login_rate_limited / login_locked / login_in_progress / login_guard_unavailable
error codes to localized messages in every login surface.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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