fix(auth): a member's clock off the register's ends the sessions of its gap, waiting for nothing

The reading of the full reading's fixes found (C1) that refusing a member
whose clock ran ahead protected only the reset's own session: a session
made on that member in the gap, by whoever knew the old password, outlived
both the member's ending and the register's notice.

issueSessionAfter now ends every session of the account here made before
the register's moment or before now, whichever is later, then makes the
new one, neither waiting nor refusing; and the register sends its clock
with each notice (sentAt), so a member takes the moment by its own clock
(as long before now as it was before it was sent), ending the gap's
sessions and leaving those made since. The passwordChanged refusal, sent
only by the clock checks, goes with them (unreleased).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

packages/halkyon_app/lib/l10n/halkyon_app_localizations_de.dart

@@ -824,10 +824,6 @@ class HalkyonAppLocalizationsDe extends HalkyonAppLocalizations {
   @override
   String get passwordDeleteSendCode => 'Code per E-Mail schicken';
 
-  @override
-  String get passwordChangedSignInAgain =>
-      'Dein Passwort wurde geändert, aber dieser Dienst konnte dich gerade noch nicht anmelden. Melde dich wieder mit dem neuen Passwort an.';
-
   @override
   String get passwordSignInAgain =>
       'Um einem Konto, das sich mit GitHub anmeldet, ein Passwort zu geben, melde dich erst wieder mit GitHub an: Es ist mehr als ein paar Minuten her.';