feat(i18n): persist Bokmal preference globally

JobTrackerApi/Controllers/AuthController.cs

@@ -96,6 +96,7 @@ public sealed class AuthController : ControllerBase
     {
         public string AppVersion { get; init; } = "unknown";
         public string? AppCommitSha { get; init; }
+        public string UiLanguage { get; init; } = "en";
     }
     public sealed record PendingEmailChangeResult(string? PendingEmail, DateTimeOffset? RequestedAtUtc);
     private const int MaxAvatarBytes = 1_000_000;
@@ -539,6 +540,21 @@ public sealed class AuthController : ControllerBase
         return NoContent();
     }
 
+    public sealed record UpdateLanguagePreferenceRequest(string? Language);
+
+    [HttpPut("preferences/language")]
+    [Authorize(AuthenticationSchemes = "local")]
+    public async Task<IActionResult> UpdateLanguagePreference([FromBody] UpdateLanguagePreferenceRequest request)
+    {
+        var user = await _users.GetUserAsync(User);
+        if (user is null) return Unauthorized();
+        var language = NormalizeUiLanguage(request?.Language);
+        if (language is null) return BadRequest("Supported languages are en and nb-NO.");
+        user.UiLanguage = language;
+        var result = await _users.UpdateAsync(user);
+        return result.Succeeded ? NoContent() : BadRequest(string.Join("; ", result.Errors.Select(error => error.Description)));
+    }
+
     public sealed record RequestEmailChangeRequest(string Email, string CurrentPassword);
     public sealed record ConfirmEmailChangeRequest(string UserId, string Email, string Token);
     public sealed record CancelEmailChangeRequest(string CurrentPassword);
@@ -1200,7 +1216,20 @@ public sealed class AuthController : ControllerBase
             MicrosoftLink: new MicrosoftLinkDto(
                 Linked: !string.IsNullOrWhiteSpace(user.MicrosoftTenantId) && !string.IsNullOrWhiteSpace(user.MicrosoftObjectId),
                 Email: user.MicrosoftEmail,
-                LinkedAt: user.MicrosoftLinkedAt));
+                LinkedAt: user.MicrosoftLinkedAt))
+        {
+            UiLanguage = NormalizeUiLanguage(user.UiLanguage) ?? "en",
+        };
+    }
+
+    private static string? NormalizeUiLanguage(string? language)
+    {
+        var value = language?.Trim();
+        if (string.Equals(value, "en", StringComparison.OrdinalIgnoreCase)) return "en";
+        if (string.Equals(value, "nb", StringComparison.OrdinalIgnoreCase)
+            || string.Equals(value, "nb-NO", StringComparison.OrdinalIgnoreCase)
+            || string.Equals(value, "no", StringComparison.OrdinalIgnoreCase)) return "nb-NO";
+        return null;
     }
 
     private MeResult WithBuildMetadata(MeResult result, bool include)

JobTrackerApi/Data/JobTrackerContext.cs

@@ -92,6 +92,10 @@ namespace JobTrackerApi.Data
             .Property(x => x.EmailFollowUpRemindersEnabled)
             .HasDefaultValue(true);
 
+        modelBuilder.Entity<ApplicationUser>()
+            .Property(x => x.UiLanguage)
+            .HasMaxLength(16);
+
         modelBuilder.Entity<AccountDeletionRequest>().Property(x => x.OwnerUserId).HasMaxLength(255);
         modelBuilder.Entity<AccountDeletionRequest>().Property(x => x.OwnerKey).HasMaxLength(64);
         modelBuilder.Entity<AccountDeletionRequest>().Property(x => x.RequestedByUserId).HasMaxLength(255);

JobTrackerApi/Migrations/20260828090000_AddUiLanguagePreference.cs

@@ -0,0 +1,27 @@
+using JobTrackerApi.Data;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace JobTrackerApi.Migrations;
+
+[DbContext(typeof(JobTrackerContext))]
+[Migration("20260828090000_AddUiLanguagePreference")]
+public partial class AddUiLanguagePreference : Migration
+{
+    protected override void Up(MigrationBuilder migrationBuilder)
+    {
+        migrationBuilder.AddColumn<string>(
+            name: "UiLanguage",
+            table: "AspNetUsers",
+            type: ActiveProvider.Contains("MySql", StringComparison.OrdinalIgnoreCase) ? "varchar(16)" : "TEXT",
+            maxLength: 16,
+            nullable: true);
+    }
+
+    protected override void Down(MigrationBuilder migrationBuilder)
+    {
+        migrationBuilder.DropColumn(name: "UiLanguage", table: "AspNetUsers");
+    }
+}

JobTrackerApi/Migrations/JobTrackerContextModelSnapshot.cs

@@ -481,6 +481,10 @@ namespace JobTrackerApi.Migrations
                     b.Property<string>("StripeSubscriptionStatus")
                         .HasColumnType("TEXT");
 
+                    b.Property<string>("UiLanguage")
+                        .HasMaxLength(16)
+                        .HasColumnType("TEXT");
+
                     b.Property<DateTimeOffset?>("TotpEnabledAtUtc")
                         .HasColumnType("TEXT");
 

JobTrackerApi/Models/ApplicationUser.cs

@@ -33,6 +33,8 @@ public sealed class ApplicationUser : IdentityUser
     public bool AiEnabled { get; set; } = true;
     public bool ExternalAiProcessingAllowed { get; set; }
     public bool EmailFollowUpRemindersEnabled { get; set; } = true;
+    // BCP 47 application UI preference. Null/legacy values safely fall back to English.
+    public string? UiLanguage { get; set; }
     public string DeletionStatus { get; set; } = AccountDeletionStatuses.Active;
     public DateTimeOffset? DeletionRequestedAtUtc { get; set; }
 }

JobTrackerApi/Services/StartupInitializationExtensions.cs

@@ -533,6 +533,7 @@ public static class StartupInitializationExtensions
                 EnsureColumn(conn, "AspNetUsers", "StripeSubscriptionId", "ALTER TABLE AspNetUsers ADD COLUMN StripeSubscriptionId TEXT NULL;");
                 EnsureColumn(conn, "AspNetUsers", "StripeSubscriptionStatus", "ALTER TABLE AspNetUsers ADD COLUMN StripeSubscriptionStatus TEXT NULL;");
                 EnsureColumn(conn, "AspNetUsers", "StripeLastEventCreatedUtc", "ALTER TABLE AspNetUsers ADD COLUMN StripeLastEventCreatedUtc TEXT NULL;");
+                EnsureColumn(conn, "AspNetUsers", "UiLanguage", "ALTER TABLE AspNetUsers ADD COLUMN UiLanguage TEXT NULL;");
 
                 static void EnsureUserRuleSettingsTable(DbConnection c)
                 {
@@ -1435,6 +1436,7 @@ public static class StartupInitializationExtensions
                     EnsureMySqlColumn(conn, "AspNetUsers", "StripeSubscriptionId", "ALTER TABLE `AspNetUsers` ADD COLUMN `StripeSubscriptionId` varchar(255) NULL;");
                     EnsureMySqlColumn(conn, "AspNetUsers", "StripeSubscriptionStatus", "ALTER TABLE `AspNetUsers` ADD COLUMN `StripeSubscriptionStatus` varchar(64) NULL;");
                     EnsureMySqlColumn(conn, "AspNetUsers", "StripeLastEventCreatedUtc", "ALTER TABLE `AspNetUsers` ADD COLUMN `StripeLastEventCreatedUtc` datetime(6) NULL;");
+                    EnsureMySqlColumn(conn, "AspNetUsers", "UiLanguage", "ALTER TABLE `AspNetUsers` ADD COLUMN `UiLanguage` varchar(16) NULL;");
 
                     // RuleSettings is MIGRATION-owned — the initial migration creates it. The reconciler
                     // used to create it too, which made a clean install fail with "Table 'RuleSettings'