feat(daily-prep): add live prep-output mode to the Details island

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/ClaudeDo.Ui.Tests/ViewModels/DetailsIslandPrepModeTests.cs

@@ -0,0 +1,83 @@
+using ClaudeDo.Data;
+using ClaudeDo.Ui.Services;
+using ClaudeDo.Ui.ViewModels.Islands;
+using Microsoft.EntityFrameworkCore;
+
+namespace ClaudeDo.Ui.Tests.ViewModels;
+
+public class DetailsIslandPrepModeTests : IDisposable
+{
+    private readonly string _dbPath;
+
+    public DetailsIslandPrepModeTests()
+    {
+        _dbPath = Path.Combine(Path.GetTempPath(), $"claudedo_prep_test_{Guid.NewGuid():N}.db");
+        using var ctx = NewContext();
+        ctx.Database.EnsureCreated();
+    }
+
+    public void Dispose()
+    {
+        try { File.Delete(_dbPath); } catch { }
+        try { File.Delete(_dbPath + "-wal"); } catch { }
+        try { File.Delete(_dbPath + "-shm"); } catch { }
+    }
+
+    private ClaudeDoDbContext NewContext()
+    {
+        var opts = new DbContextOptionsBuilder<ClaudeDoDbContext>()
+            .UseSqlite($"Data Source={_dbPath}")
+            .Options;
+        return new ClaudeDoDbContext(opts);
+    }
+
+    private sealed class TestDbFactory : IDbContextFactory<ClaudeDoDbContext>
+    {
+        private readonly Func<ClaudeDoDbContext> _create;
+        public TestDbFactory(Func<ClaudeDoDbContext> create) => _create = create;
+        public ClaudeDoDbContext CreateDbContext() => _create();
+    }
+
+    private sealed class DefaultStub : StubWorkerClient { }
+
+    private sealed class StubNotesApi : ClaudeDo.Ui.Services.Interfaces.INotesApi
+    {
+        public Task<List<DailyNoteDto>> ListAsync(DateOnly day) => Task.FromResult(new List<DailyNoteDto>());
+        public Task<DailyNoteDto?> AddAsync(DateOnly day, string text) => Task.FromResult<DailyNoteDto?>(null);
+        public Task UpdateAsync(string id, string text) => Task.CompletedTask;
+        public Task DeleteAsync(string id) => Task.CompletedTask;
+    }
+
+    private DetailsIslandViewModel NewDetailsVm(StubWorkerClient stub)
+    {
+        var factory = new TestDbFactory(NewContext);
+        return new DetailsIslandViewModel(factory, stub, new NullServiceProvider(), new StubNotesApi());
+    }
+
+    private sealed class NullServiceProvider : IServiceProvider
+    {
+        public object? GetService(Type serviceType) => null;
+    }
+
+    [Fact]
+    public void PrepLine_event_appends_to_PrepLog()
+    {
+        var stub = new DefaultStub();
+        var vm = NewDetailsVm(stub);
+
+        stub.RaisePrepLine("{\"type\":\"assistant\",\"message\":{\"content\":[{\"type\":\"text\",\"text\":\"hi\"}]}}");
+
+        Assert.NotEmpty(vm.PrepLog);
+    }
+
+    [Fact]
+    public void ShowPrep_sets_prep_mode_and_clears_notes_mode()
+    {
+        var vm = NewDetailsVm(new DefaultStub());
+        vm.ShowPrep();
+
+        Assert.True(vm.IsPrepMode);
+        Assert.False(vm.IsNotesMode);
+        Assert.False(vm.IsTaskDetailVisible);
+    }
+}