feat(ui): NotesEditorViewModel with day navigation and bullet CRUD

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

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+using ClaudeDo.Ui.Services;
+using ClaudeDo.Ui.Services.Interfaces;
+using ClaudeDo.Ui.ViewModels.Islands;
+
+namespace ClaudeDo.Ui.Tests.ViewModels;
+
+public class NotesEditorViewModelTests
+{
+    private sealed class FakeNotes : INotesApi
+    {
+        public readonly List<DailyNoteDto> Store = new();
+        private int _seq;
+        public Task<List<DailyNoteDto>> ListAsync(DateOnly day) =>
+            Task.FromResult(Store.Where(n => n.Date == day.ToString("yyyy-MM-dd")).ToList());
+        public Task<DailyNoteDto?> AddAsync(DateOnly day, string text)
+        {
+            var dto = new DailyNoteDto($"id{_seq++}", day.ToString("yyyy-MM-dd"), text, Store.Count);
+            Store.Add(dto);
+            return Task.FromResult<DailyNoteDto?>(dto);
+        }
+        public Task UpdateAsync(string id, string text)
+        {
+            var i = Store.FindIndex(n => n.Id == id);
+            if (i >= 0) Store[i] = Store[i] with { Text = text };
+            return Task.CompletedTask;
+        }
+        public Task DeleteAsync(string id) { Store.RemoveAll(n => n.Id == id); return Task.CompletedTask; }
+    }
+
+    [Fact]
+    public async Task AddBullet_PersistsAndAppears_ForCurrentDay()
+    {
+        var api = new FakeNotes();
+        var vm = new NotesEditorViewModel(api);
+        await vm.LoadDayAsync(new DateOnly(2026, 6, 1));
+
+        vm.NewBulletText = "Standup vorbereitet";
+        await vm.AddBulletCommand.ExecuteAsync(null);
+
+        Assert.Single(vm.Bullets);
+        Assert.Equal("Standup vorbereitet", vm.Bullets[0].Text);
+        Assert.Equal("", vm.NewBulletText);
+        Assert.Single(api.Store);
+    }
+
+    [Fact]
+    public async Task PrevAndNextDay_NavigateAndReload()
+    {
+        var api = new FakeNotes();
+        await api.AddAsync(new DateOnly(2026, 5, 31), "gestern");
+        var vm = new NotesEditorViewModel(api);
+        await vm.LoadDayAsync(new DateOnly(2026, 6, 1));
+        Assert.Empty(vm.Bullets);
+
+        await vm.PrevDayCommand.ExecuteAsync(null);
+        Assert.Equal(new DateOnly(2026, 5, 31), vm.CurrentDay);
+        Assert.Single(vm.Bullets);
+
+        await vm.NextDayCommand.ExecuteAsync(null);
+        Assert.Equal(new DateOnly(2026, 6, 1), vm.CurrentDay);
+        Assert.Empty(vm.Bullets);
+    }
+
+    [Fact]
+    public async Task DeleteBullet_RemovesFromStoreAndList()
+    {
+        var api = new FakeNotes();
+        var vm = new NotesEditorViewModel(api);
+        await vm.LoadDayAsync(new DateOnly(2026, 6, 1));
+        vm.NewBulletText = "weg damit";
+        await vm.AddBulletCommand.ExecuteAsync(null);
+
+        await vm.Bullets[0].DeleteCommand.ExecuteAsync(null);
+
+        Assert.Empty(vm.Bullets);
+        Assert.Empty(api.Store);
+    }
+}