[refactor] Improve workflow domain organization (#5584)

* [refactor] move workflow domain to its own folder

* [refactor] Fix workflow platform architecture organization

- Move workflow rendering functionality to renderer/thumbnail domain
- Rename ui folder to management for better semantic clarity
- Update all import paths to reflect proper domain boundaries
- Fix test imports to use new structure

Architecture improvements:
- rendering → renderer/thumbnail (belongs with other rendering logic)
- ui → management (better name for state management and UI integration)

This ensures proper separation of concerns and domain boundaries.

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

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

* [fix] Resolve circular dependency between nodeDefStore and subgraphStore

* [fix] Update browser test imports to use new workflow platform paths

---------

Co-authored-by: Claude <noreply@anthropic.com>

src/composables/graph/useCanvasRefresh.ts

@@ -1,6 +1,6 @@
 // call nextTick on all changeTracker
+import { useWorkflowStore } from '@/platform/workflow/management/stores/workflowStore'
 import { useCanvasStore } from '@/renderer/core/canvas/canvasStore'
-import { useWorkflowStore } from '@/stores/workflowStore'
 
 /**
  * Composable for refreshing nodes in the graph

src/composables/graph/useGroupMenuOptions.ts

@@ -5,9 +5,9 @@ import {
   type LGraphGroup,
   type LGraphNode
 } from '@/lib/litegraph/src/litegraph'
+import { useWorkflowStore } from '@/platform/workflow/management/stores/workflowStore'
 import { useCanvasStore } from '@/renderer/core/canvas/canvasStore'
 import { useSettingStore } from '@/stores/settingStore'
-import { useWorkflowStore } from '@/stores/workflowStore'
 
 import { useCanvasRefresh } from './useCanvasRefresh'
 import type { MenuOption } from './useMoreOptionsMenu'

src/composables/graph/useSelectedNodeActions.ts

@@ -1,8 +1,8 @@
 import { useSelectedLiteGraphItems } from '@/composables/canvas/useSelectedLiteGraphItems'
 import { LGraphEventMode } from '@/lib/litegraph/src/litegraph'
+import { useWorkflowStore } from '@/platform/workflow/management/stores/workflowStore'
 import { app } from '@/scripts/app'
 import { useCommandStore } from '@/stores/commandStore'
-import { useWorkflowStore } from '@/stores/workflowStore'
 import { filterOutputNodes } from '@/utils/nodeFilterUtil'
 
 /**

src/composables/graph/useSelectionOperations.ts

@@ -1,6 +1,7 @@
 // import { useSelectedLiteGraphItems } from '@/composables/canvas/useSelectedLiteGraphItems' // Unused for now
 import { t } from '@/i18n'
 import { LGraphNode } from '@/lib/litegraph/src/litegraph'
+import { useWorkflowStore } from '@/platform/workflow/management/stores/workflowStore'
 import {
   useCanvasStore,
   useTitleEditorStore
@@ -8,7 +9,6 @@ import {
 import { app } from '@/scripts/app'
 import { useDialogService } from '@/services/dialogService'
 import { useToastStore } from '@/stores/toastStore'
-import { useWorkflowStore } from '@/stores/workflowStore'
 
 /**
  * Composable for handling basic selection operations like copy, paste, duplicate, delete, rename

src/composables/graph/useSubgraphOperations.ts

@@ -1,10 +1,10 @@
 import { useSelectedLiteGraphItems } from '@/composables/canvas/useSelectedLiteGraphItems'
 import { SubgraphNode } from '@/lib/litegraph/src/litegraph'
+import { useWorkflowStore } from '@/platform/workflow/management/stores/workflowStore'
 import { useCanvasStore } from '@/renderer/core/canvas/canvasStore'
 import { useNodeOutputStore } from '@/stores/imagePreviewStore'
 import { useNodeBookmarkStore } from '@/stores/nodeBookmarkStore'
 import { useNodeDefStore } from '@/stores/nodeDefStore'
-import { useWorkflowStore } from '@/stores/workflowStore'
 import { isLGraphNode } from '@/utils/litegraphUtil'
 
 /**