[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/components/load3d/Load3DScene.vue

@@ -5,7 +5,6 @@
 </template>
 
 <script setup lang="ts">
-import { LGraphNode } from '@comfyorg/litegraph'
 import { onMounted, onUnmounted, ref, toRaw, watch } from 'vue'
 
 import LoadingOverlay from '@/components/load3d/LoadingOverlay.vue'
@@ -17,6 +16,7 @@ import {
   UpDirection
 } from '@/extensions/core/load3d/interfaces'
 import { t } from '@/i18n'
+import { LGraphNode } from '@/lib/litegraph/src/litegraph'
 import type { CustomInputSpec } from '@/schemas/nodeDef/nodeDefSchemaV2'
 import { useLoad3dService } from '@/services/load3dService'
 

src/components/load3d/controls/RecordingControls.vue

@@ -75,11 +75,11 @@
 </template>
 
 <script setup lang="ts">
-import { LGraphNode } from '@comfyorg/litegraph'
 import { Tooltip } from 'primevue'
 import Button from 'primevue/button'
 
 import { t } from '@/i18n'
+import { LGraphNode } from '@/lib/litegraph/src/litegraph'
 import { useLoad3dService } from '@/services/load3dService'
 
 const vTooltip = Tooltip