Phase 2 of ComfyPage refactor:
- Add ToastHelper, DragDropHelper, CommandHelper instances to ComfyPage
- Remove migrated methods from ComfyPage (command, toast, dragDrop, workflow, canvasOps, nodeOps methods)
- Update all test files to use new helper paths
- Keep visibleToasts as passthrough getter for backward compatibility
Amp-Thread-ID: https://ampcode.com/threads/T-019c1666-ed27-773c-976a-07cc805d7a6c
Co-authored-by: Amp <amp@ampcode.com>