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v1.4.25 W7 phase 6 — proposal §4 Option C as default-value layer.
The registration form now reads
Intl.DateTimeFormat().resolvedOptions().timeZone and sends it with
the signup payload. The server:
1. Validates the value against Intl.supportedValuesOf via
isValidTimezone().
2. On any invalid value (or absence), resolves the admin-
configured server default (AppSettings.defaultUserTimezone) and
uses that.
3. On no admin default, the resolver falls back to the
'Europe/Berlin' string, which is also the User.timezone column
default — so the worst case still produces the legacy
pre-v1.4.25 behaviour.
The Zod registerSchema gains an optional 'timezone' string field
capped at 64 chars (matches the longest IANA canonical zone
identifier plus headroom). Audit-log entry now carries the resolved
zone so an operator can spot a Tokyo user mis-attributed to Berlin
if browser detection fails.
No new tests — the existing register-route integration coverage is
thin, and the v1.4.25 W7 phase 7 integration test in
Pacific/Auckland covers the full signup → measurement → export
round-trip end-to-end.