Pick rest time on a 1-second wheel

Replaces the 5-second Steppers in Settings and the routine editor's
custom-rest row with a shared SecondsWheelRow: the row shows the value
and tapping it expands an inline wheel (10-180s, 1s steps) beneath.

Workouts/Views/Routines/RoutineAddEditView.swift

@@ -132,13 +132,7 @@ struct RoutineAddEditView: View {
 
                 Toggle("Custom Rest Time", isOn: $restOverrideEnabled)
                 if restOverrideEnabled {
-                    Stepper(value: $restSecondsValue, in: 10...180, step: 5) {
-                        HStack {
-                            Text("Rest Time")
-                            Spacer()
-                            Text("\(restSecondsValue)s").foregroundColor(.secondary)
-                        }
-                    }
+                    SecondsWheelRow(title: "Rest Time", range: 10...180, seconds: $restSecondsValue)
                 }
             } header: {
                 Text("Rest & Pacing")