Replaces the explicit "look up existing account" search field with automatic
lookup as email/phone are entered, requires operator confirmation before any
matched account's name/email/phone/preference is changed, adds a password
show/hide toggle, and fixes two bugs found during testing: entering a phone
number belonging to a different account could silently overwrite the form
with that account's details, and re-checking an unchanged field (e.g. from
tapping a ticket quantity button) could revert edits already made. Also adds
a server-side check rejecting registrations whose email and phone resolve to
two different existing accounts, as defense in depth.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
joshuaandClaude Sonnet 5