feat(notes): notes get their own list, a day log and an Enter chain

The editor was reachable from one button that only appeared in My Day,
which is how it got forgotten. It is now a permanent sidebar entry next
to My Day and Planned, and it fills the tasks island rather than the
details pane, because a note list is content.

Inside, the date picker is gone: today sits at the top with the capture
box, older days follow as dated groups. Enter in a note saves it and
opens the next one, Shift+Enter breaks the line so notes can be several,
Backspace on an empty note deletes it and steps back up. Deleting also
has a visible hover button instead of only "clear the text and hope".
Agent-written notes carry a marker.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

tests/ClaudeDo.Worker.Tests/UiVm/TasksIslandViewModelPlanningTests.cs

@@ -112,6 +112,7 @@ sealed class FakeWorkerClient : IWorkerClient
     public Task<int> GetPendingDraftCountAsync(string taskId, CancellationToken ct = default) => Task.FromResult(0);
     public Task<IReadOnlyList<WorkerLogEntry>> GetRecentLogsAsync() => Task.FromResult<IReadOnlyList<WorkerLogEntry>>(System.Array.Empty<WorkerLogEntry>());
 
+    public event Action? NotesUpdatedEvent;
     public event Action? PrepStartedEvent;
     public event Action<string>? PrepLineEvent;
     public event Action<bool>? PrepFinishedEvent;
@@ -153,6 +154,7 @@ sealed class FakeWorkerClient : IWorkerClient
     public Task<bool> RunDailyPrepNowAsync() => Task.FromResult(false);
     public Task ClearMyDayAsync() => Task.CompletedTask;
     public Task<List<DailyNoteDto>> GetDailyNotesAsync(DateOnly day) => Task.FromResult(new List<DailyNoteDto>());
+    public Task<List<DailyNoteDto>> GetDailyNotesBetweenAsync(DateOnly start, DateOnly end) => Task.FromResult(new List<DailyNoteDto>());
     public Task<DailyNoteDto?> AddDailyNoteAsync(DateOnly day, string text) => Task.FromResult<DailyNoteDto?>(null);
     public Task UpdateDailyNoteAsync(string id, string text) => Task.CompletedTask;
     public Task DeleteDailyNoteAsync(string id) => Task.CompletedTask;