Workout "mark all complete" + recurring-task done confirmation notification

- Workout window: the header ⋯ menu gains "Mark All Complete" and "Clear All
  Sets" (Manage Workouts preserved). New WorkoutViewModel.setAllSetsDone(_:)
  ticks every set across all sections/exercises and runs the normal completion/
  logging path.
- Recurring tasks: completing an occurrence now posts a quiet "✓ Done. Repeats
  <tomorrow / in 1 week / …>" confirmation via NotificationManager
  .notifyRecurringCompleted, phrased from the next active occurrence. Hooked
  into TaskViewModel.toggleOccurrence; un-completing does nothing.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

KisaniCal/Views/WorkoutView.swift

@@ -105,7 +105,24 @@ struct WorkoutView: View {
                     Spacer()
                     IButton(icon: "chart.bar.xaxis") { showStats = true }
                     IButton(icon: "clock.arrow.circlepath") { showHistory = true }
-                    IButton(icon: "ellipsis") { showManage = true }
+                    Menu {
+                        Button { withAnimation(KisaniSpring.snappy) { vm.setAllSetsDone(true) } } label: {
+                            Label("Mark All Complete", systemImage: "checkmark.circle")
+                        }
+                        Button { withAnimation(KisaniSpring.snappy) { vm.setAllSetsDone(false) } } label: {
+                            Label("Clear All Sets", systemImage: "circle")
+                        }
+                        Divider()
+                        Button { showManage = true } label: { Label("Manage Workouts", systemImage: "slider.horizontal.3") }
+                    } label: {
+                        Image(systemName: "ellipsis")
+                            .font(.system(size: 13, weight: .medium))
+                            .foregroundColor(AppColors.text2(cs))
+                            .frame(width: 34, height: 34)
+                            .background(AppColors.surface2(cs))
+                            .clipShape(Circle())
+                            .overlay(Circle().stroke(AppColors.border(cs), lineWidth: 1))
+                    }
                 }
                 .listRowBackground(Color.clear)
                 .listRowSeparator(.hidden)