feat(i18n): persist Bokmal preference globally

JobTrackerApi.Tests/MigrationChainTests.cs

@@ -40,6 +40,9 @@ public sealed class MigrationChainTests
             SELECT COUNT(*) FROM pragma_table_info('AspNetUsers')
             WHERE name = 'EmailFollowUpRemindersEnabled' AND dflt_value IN ('1', 'true');
             """));
+        Assert.Equal(1, await ScalarAsync<long>(connection, """
+            SELECT COUNT(*) FROM pragma_table_info('AspNetUsers') WHERE name = 'UiLanguage';
+            """));
     }
 
     [Fact]
@@ -93,6 +96,7 @@ public sealed class MigrationChainTests
         Assert.Contains("CONSTRAINT `FK_AccountDeletionFiles_Request`", script, StringComparison.Ordinal);
         Assert.Contains("CREATE TABLE IF NOT EXISTS `AspNetUsers`", script, StringComparison.Ordinal);
         Assert.Contains("CREATE TABLE IF NOT EXISTS `AiInteractions`", script, StringComparison.Ordinal);
+        Assert.Contains("`UiLanguage` varchar(16)", script, StringComparison.Ordinal);
         Assert.All(
             Regex.Matches(script, "CONSTRAINT `([^`]+)`").Select(match => match.Groups[1].Value),
             identifier => Assert.True(identifier.Length <= 64, $"MariaDB constraint identifier exceeds 64 characters: {identifier}"));