feat(data): add ImportTickets prime kind, ticket fallback list and import prompt

tests/ClaudeDo.Data.Tests/TicketFieldsTests.cs

@@ -1,3 +1,4 @@
+using ClaudeDo.Data.Repositories;
 using ClaudeDo.Data;
 using ClaudeDo.Data.Models;
 using Microsoft.EntityFrameworkCore;
@@ -60,4 +61,31 @@ public sealed class TicketFieldsTests : IDisposable
         Assert.Null((await read.Tasks.SingleAsync()).TicketRef);
         Assert.Null((await read.ListConfigs.SingleAsync()).TicketProjectId);
     }
+
+    [Fact]
+    public async Task TicketFallbackListId_round_trips_and_survives_a_settings_save()
+    {
+        await using (var ctx = NewContext())
+            await new AppSettingsRepository(ctx).SetTicketFallbackListIdAsync("l-fallback");
+
+        // The general settings save must not wipe it — UpdateAsync's copy block doesn't carry it.
+        await using (var ctx = NewContext())
+        {
+            var repo = new AppSettingsRepository(ctx);
+            await repo.UpdateAsync(await repo.GetAsync());
+        }
+
+        await using var read = NewContext();
+        Assert.Equal("l-fallback", (await new AppSettingsRepository(read).GetAsync()).TicketFallbackListId);
+    }
+
+    [Fact]
+    public async Task Blank_TicketFallbackListId_is_stored_as_null()
+    {
+        await using (var ctx = NewContext())
+            await new AppSettingsRepository(ctx).SetTicketFallbackListIdAsync("  ");
+
+        await using var read = NewContext();
+        Assert.Null((await new AppSettingsRepository(read).GetAsync()).TicketFallbackListId);
+    }
 }