refactor: Clean up layout store and implement proper CRDT operations

- Created dedicated layoutOperations.ts with production-grade CRDT interfaces
- Integrated existing QuadTree spatial index instead of simple cache
- Split composables into separate files (useLayout, useNodeLayout, useLayoutSync)
- Cleaned up operation handlers using specific types instead of Extract
- Added proper operation interfaces with type guards and extensibility
- Updated all type references to use new operation structure

The layout store now properly uses the existing QuadTree infrastructure for
efficient spatial queries and follows CRDT best practices with well-defined
operation interfaces.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/components/graph/GraphCanvas.vue

@@ -131,7 +131,8 @@ import type {
   NodeState,
   VueNodeData
 } from '@/composables/graph/useGraphNodeManager'
-import { useLayout, useLayoutSync } from '@/composables/graph/useLayout'
+import { useLayout } from '@/composables/graph/useLayout'
+import { useLayoutSync } from '@/composables/graph/useLayoutSync'
 import { useNodeBadge } from '@/composables/node/useNodeBadge'
 import { useCanvasDrop } from '@/composables/useCanvasDrop'
 import { useContextMenuTranslation } from '@/composables/useContextMenuTranslation'

src/components/graph/vueNodes/LGraphNode.vue

@@ -92,7 +92,7 @@ import { computed, onErrorCaptured, ref, toRef, watch } from 'vue'
 // Import the VueNodeData type
 import type { VueNodeData } from '@/composables/graph/useGraphNodeManager'
 import { LODLevel, useLOD } from '@/composables/graph/useLOD'
-import { useNodeLayout } from '@/composables/graph/useLayout'
+import { useNodeLayout } from '@/composables/graph/useNodeLayout'
 import { useErrorHandling } from '@/composables/useErrorHandling'
 
 import { LiteGraph } from '../../../lib/litegraph/src/litegraph'