Add UX tweaks to task rows: tooltips, pointer cursor, delete button

- Show pointing hand cursor when hovering over the checkbox button
- Add tooltips to checkbox ("Mark as complete/incomplete"), plus
  ("Add subtask"), and delete ("Delete task") buttons
- Add visible-on-hover delete button (trash icon) to the right of
  the add subtask button, hidden for completed tasks

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: crazytan

TaskMenu/Views/TaskRowView.swift

@@ -89,6 +89,14 @@ struct TaskRowView: View {
                     .scaleEffect(checkmarkScale)
             }
             .buttonStyle(.plain)
+            .onHover { hovering in
+                if hovering {
+                    NSCursor.pointingHand.push()
+                } else {
+                    NSCursor.pop()
+                }
+            }
+            .help(task.isCompleted ? "Mark as incomplete" : "Mark as complete")
             .accessibilityIdentifier("task.checkbox.\(task.id)")
 
             VStack(alignment: .leading, spacing: 2) {
@@ -120,8 +128,20 @@ struct TaskRowView: View {
                         .frame(width: 24, height: 24)
                 }
                 .buttonStyle(.plain)
+                .help("Add subtask")
                 .opacity(isHovering ? 1 : 0)
             }
+
+            if isHovering && !task.isCompleted {
+                Button(action: onDelete) {
+                    Image(systemName: "trash")
+                        .font(.system(size: 12, weight: .medium))
+                        .foregroundStyle(.secondary)
+                        .frame(width: 24, height: 24)
+                }
+                .buttonStyle(.plain)
+                .help("Delete task")
+            }
         }
         .padding(.vertical, TaskRowLayout.verticalPadding)
         .padding(.leading, TaskRowLayout.leadingPadding)