[refactor] Migrate litegraph imports from npm package to local subtree

- Updated all imports from '@comfyorg/litegraph' to '@/lib/litegraph/src/'
- Replaced deep dist imports with direct source paths
- Updated CSS import in main.ts
- All imports now use the @ alias consistently

src/composables/canvas/useCanvasTransformSync.ts

@@ -1,6 +1,6 @@
-import { LGraphCanvas } from '@comfyorg/litegraph'
 import { onUnmounted, ref } from 'vue'
 
+import { LGraphCanvas } from '@/lib/litegraph/src/litegraph'
 import { useCanvasStore } from '@/stores/graphStore'
 
 interface CanvasTransformSyncOptions {

src/composables/canvas/useSelectedLiteGraphItems.ts

@@ -3,8 +3,7 @@ import {
   LGraphNode,
   Positionable,
   Reroute
-} from '@comfyorg/litegraph'
-
+} from '@/lib/litegraph/src/litegraph'
 import { app } from '@/scripts/app'
 import { useCanvasStore } from '@/stores/graphStore'
 import {