fix(auth): GitHub's end deletes what it says, when it says

An account deleted at GitHub's end whose host step after the deletion's
transaction failed counts as deleted, its GitHub ID gone with it, not as
one to try again (the short reading). The app's text for an account that
signs in with GitHub alone named the end as the day it would be deleted;
it is deleted 30 days later (gitHubAccountsKeptAfterEnd), which the text
now says, in English and German.

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_en.dart

@@ -861,7 +861,7 @@ class HalkyonAppLocalizationsEn extends HalkyonAppLocalizations {
 
   @override
   String passwordSectionGitHubEndsDeletes(String date) {
-    return 'Sign-in with GitHub ends on $date. Your account, with everything in it, will be deleted then, unless you set up a password before.';
+    return 'Sign-in with GitHub ends on $date. Set up a password before then: an account without one is deleted 30 days later, with everything in it.';
   }
 
   @override