v1.3.0

• Add isFormIgnored flag on FigureElement to exclude an element from equation form changes — when set, the element is skipped by form layout, show/hide, transform/color sets, and elementMods, so its user-applied transform, color, and visibility persist across showForm / goToForm
• Form-ignored elements contribute zero size to layout, so they don't shift adjacent elements when included in a form's content
• Note: form-driven animations still cancel any in-flight animations on ignored elements via collectionMethods.stop() — the contract is "no new form-driven changes", not full isolation