[refactor] Improve updates/notifications domain organization (#5590)

* [refactor] Move update-related functionality to platform/updates domain

Reorganizes release management, version compatibility, and notification functionality
following Domain-Driven Design principles, mirroring VSCode's architecture pattern.

- Move releaseService.ts to platform/updates/common/
- Move releaseStore.ts to platform/updates/common/
- Move versionCompatibilityStore.ts to platform/updates/common/
- Move useFrontendVersionMismatchWarning.ts to platform/updates/common/
- Move toastStore.ts to platform/updates/common/
- Move ReleaseNotificationToast.vue to platform/updates/components/
- Move WhatsNewPopup.vue to platform/updates/components/
- Update 25+ import paths across codebase and tests

This creates a cohesive "updates" domain containing all functionality related to
software updates, version checking, release notifications, and user communication
about application state changes.

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

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

* fix imports

---------

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

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 { useToastStore } from '@/platform/updates/common/toastStore'
 import { useWorkflowStore } from '@/platform/workflow/management/stores/workflowStore'
 import {
   useCanvasStore,
@@ -8,7 +9,6 @@ import {
 } from '@/renderer/core/canvas/canvasStore'
 import { app } from '@/scripts/app'
 import { useDialogService } from '@/services/dialogService'
-import { useToastStore } from '@/stores/toastStore'
 
 /**
  * Composable for handling basic selection operations like copy, paste, duplicate, delete, rename