Rework self-service kiosk account lookup for privacy and safety (1.3.2)

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>

CHANGELOG.md

@@ -7,6 +7,22 @@ and this project follows [Semantic Versioning](https://semver.org/).
 
 ## [Unreleased]
 
+## [1.3.2] - 2026-08-03
+
+### Added
+
+- Self-service kiosk: all password fields (supervisor sign-in, change event, and the visitor "Choose a password" field) now have a show/hide toggle button, so staff can verify what they've typed on the touchscreen instead of typing blind.
+
+### Fixed
+
+- Self-service kiosk: removed the separate "Look up existing account" search field — for privacy, staff no longer type a visitor's email/phone into a dedicated search box. Instead, entering an email or phone number in the registration form itself (Email and Cell Number are now the first two fields, followed by Name) automatically checks for a matching account once that field is left.
+- Self-service kiosk: matched accounts are no longer updated silently. If the operator's typed Name, Email, Cell Number, or "Send tickets via" preference differs from what's on file, a confirmation dialog now lists exactly what will change (old value → new value) and requires the operator to confirm before the account is updated.
+- Self-service kiosk / manual registration: an existing account's name is now actually updated when confirmed changed (previously silently discarded), and email/phone corrections are applied even when the account already had a real value on file (previously only blank phone numbers or guest-placeholder emails could be replaced).
+- Self-service kiosk: fixed a bug where changing the phone number to one belonging to a different account would silently replace the Name/Email fields with that other account's details, and re-editing the email back to the original value afterward would not re-check it — together this could result in a registration being (or looking like it would be) saved under the wrong account. Email and phone matches are now tracked independently; if they resolve to two different existing accounts, the kiosk shows a clear warning naming both accounts and blocks registration until the operator corrects one of the fields, instead of silently merging or overwriting details.
+- Manual registration API: added a server-side check, independent of the kiosk UI, that rejects (`409`) a registration whose submitted email and phone number belong to two different existing accounts — a defense-in-depth safeguard against one account's contact details being overwritten with, or hijacked by, another's.
+- Manual registration API: an existing account's notification preference is now validated against its final email/phone after any confirmed update (e.g. falls back off "WhatsApp"/"Both" if no valid phone remains, or onto "WhatsApp" if the email was cleared in favor of a real phone), instead of persisting a preference that no longer matches the account's actual contact info.
+- Self-service kiosk: tapping anywhere else on the page (e.g. a ticket quantity +/− button) while Email or Cell Number was focused blurred that field and silently re-ran its account lookup; even though the match hadn't changed, this reset Name/Email/Phone/preference back to the matched account's original values, discarding any edits the operator had just made. The autofill now only applies once per distinct matched account instead of on every re-check.
+
 ## [1.3.1] - 2026-07-28
 
 ### Fixed