[refactor] Improve renderer domain organization (#5552)

* [refactor] Improve renderer architecture organization

Building on PR #5388, this refines the renderer domain structure:

**Key improvements:**
- Group all transform utilities in `transform/` subdirectory for better cohesion
- Move canvas state to dedicated `renderer/core/canvas/` domain
- Consolidate coordinate system logic (TransformPane, useTransformState, sync utilities)

**File organization:**
- `renderer/core/canvas/canvasStore.ts` (was `stores/graphStore.ts`)
- `renderer/core/layout/transform/` contains all coordinate system utilities
- Transform sync utilities co-located with core transform logic

This creates clearer domain boundaries and groups related functionality
while building on the foundation established in PR #5388.

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

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

* fix: Clean up linter-modified files

* Fix import paths and clean up unused imports after rebase

- Update all remaining @/stores/graphStore references to @/renderer/core/canvas/canvasStore
- Remove unused imports from selection toolbox components
- All tests pass, only reka-ui upstream issue remains in typecheck

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

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

* [auto-fix] Apply ESLint and Prettier fixes

---------

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: GitHub Action <action@github.com>

src/renderer/extensions/minimap/composables/useMinimap.ts

@@ -2,7 +2,7 @@ import { useRafFn } from '@vueuse/core'
 import { computed, nextTick, ref, watch } from 'vue'
 
 import type { LGraph } from '@/lib/litegraph/src/litegraph'
-import { useCanvasStore } from '@/stores/graphStore'
+import { useCanvasStore } from '@/renderer/core/canvas/canvasStore'
 import { useSettingStore } from '@/stores/settingStore'
 import { useWorkflowStore } from '@/stores/workflowStore'
 

src/renderer/extensions/vueNodes/composables/useNodeEventHandlers.ts

@@ -11,8 +11,8 @@
 import type { Ref } from 'vue'
 
 import type { VueNodeData } from '@/composables/graph/useGraphNodeManager'
+import { useCanvasStore } from '@/renderer/core/canvas/canvasStore'
 import { useNodeZIndex } from '@/renderer/extensions/vueNodes/composables/useNodeZIndex'
-import { useCanvasStore } from '@/stores/graphStore'
 
 interface NodeManager {
   getNode: (id: string) => any

src/renderer/extensions/vueNodes/widgets/composables/useImagePreviewWidget.ts

@@ -8,11 +8,11 @@ import type {
   IBaseWidget,
   IWidgetOptions
 } from '@/lib/litegraph/src/types/widgets'
+import { useCanvasStore } from '@/renderer/core/canvas/canvasStore'
 import type { InputSpec } from '@/schemas/nodeDef/nodeDefSchemaV2'
 import { app } from '@/scripts/app'
 import { calculateImageGrid } from '@/scripts/ui/imagePreview'
 import { ComfyWidgetConstructorV2 } from '@/scripts/widgets'
-import { useCanvasStore } from '@/stores/graphStore'
 import { useSettingStore } from '@/stores/settingStore'
 import { is_all_same_aspect_ratio } from '@/utils/imageUtil'