feat(ui): My Day actions, orphan-aware grouping, menu restructure

Pending UI work:
- My Day add/remove context actions on task rows (parent removal cascades to children)
- orphan-aware grouping: a child whose parent isn't in view renders as a top-level row, not an indented draft
- shell menu restructure (Worker / Repositories submenus); 'Finalize plan' action, drop 'Queue subtasks sequentially'
- notes editor refinements
- subtask-row hover tweak (Surface3, no transition)
- bump Avalonia 12.0.0 -> 12.0.4

src/ClaudeDo.Ui/ViewModels/Islands/TasksIslandViewModel.cs

@@ -334,6 +334,10 @@ public sealed partial class TasksIslandViewModel : ViewModelBase, IDisposable
         // Items is already ordered by SortOrder from the DB query.
         // Treat rows whose ParentTaskId is not in the current view as orphans -> top-level.
         var visibleIds = Items.Select(r => r.Id).ToHashSet();
+        // A child reads as a child only while its parent is in the view. Flag orphans so they
+        // render flat (no indent, no Draft/Planned badge) instead of breaking the layout.
+        foreach (var r in Items)
+            r.ParentInView = string.IsNullOrEmpty(r.ParentTaskId) || visibleIds.Contains(r.ParentTaskId!);
         bool IsTopLevel(TaskRowViewModel r) =>
             !r.IsChild
             || string.IsNullOrEmpty(r.ParentTaskId)
@@ -571,6 +575,52 @@ public sealed partial class TasksIslandViewModel : ViewModelBase, IDisposable
         TasksChanged?.Invoke(this, EventArgs.Empty);
     }
 
+    [RelayCommand]
+    private async Task AddToMyDayAsync(TaskRowViewModel? row)
+    {
+        if (row is null || row.IsMyDay) return;
+        row.IsMyDay = true;
+        await using var db = await _dbFactory.CreateDbContextAsync();
+        var entity = await db.Tasks.FirstOrDefaultAsync(t => t.Id == row.Id);
+        if (entity != null)
+        {
+            entity.IsMyDay = true;
+            await db.SaveChangesAsync();
+        }
+        Regroup();
+        UpdateSubtitle();
+        TasksChanged?.Invoke(this, EventArgs.Empty);
+    }
+
+    [RelayCommand]
+    private async Task RemoveFromMyDayAsync(TaskRowViewModel? row)
+    {
+        if (row is null) return;
+        row.IsMyDay = false;
+        await using var db = await _dbFactory.CreateDbContextAsync();
+        // Removing a parent takes its whole plan off My Day: clear the task and every child, so no
+        // orphaned child is left behind (independently-IsMyDay children included). A leaf child has
+        // no children of its own, so this collapses to just clearing the row itself.
+        var affected = await db.Tasks
+            .Where(t => t.Id == row.Id || t.ParentTaskId == row.Id)
+            .ToListAsync();
+        foreach (var t in affected)
+            t.IsMyDay = false;
+        if (affected.Count > 0)
+            await db.SaveChangesAsync();
+        if (_currentList?.Id == "smart:my-day")
+        {
+            var drop = Items
+                .Where(r => r.Id == row.Id || r.ParentTaskId == row.Id)
+                .ToList();
+            foreach (var r in drop)
+                Items.Remove(r);
+        }
+        Regroup();
+        UpdateSubtitle();
+        TasksChanged?.Invoke(this, EventArgs.Empty);
+    }
+
     public async Task SetStatusOnRowAsync(TaskRowViewModel row, TaskStatus status)
     {
         if (_worker is null) return;
@@ -582,6 +632,12 @@ public sealed partial class TasksIslandViewModel : ViewModelBase, IDisposable
     private async Task SendToQueueAsync(TaskRowViewModel? row)
     {
         if (row is null || row.IsRunning) return;
+        // A finalized planning parent queues its plan (children sequentially), not itself.
+        if (row.CanQueuePlan)
+        {
+            await QueuePlanningSubtasksAsync(row);
+            return;
+        }
         await using var db = await _dbFactory.CreateDbContextAsync();
         var entity = await db.Tasks.FirstOrDefaultAsync(t => t.Id == row.Id);
         if (entity is null) return;