feat: add schedule preview functionality for production plans

- Implemented previewSchedule and previewSemiSchedule functions in the production controller to allow users to preview schedule changes without making actual database modifications.
- Added corresponding routes for schedule preview in productionRoutes.
- Enhanced productionPlanService with logic to generate schedule previews based on provided items and plan IDs.
- Introduced SchedulePreviewDialog component to display the preview results in the frontend, including summary and detailed views of planned schedules.

These updates improve the user experience by providing a way to visualize scheduling changes before applying them, ensuring better planning and decision-making.

Made-with: Cursor

frontend/package.json

@@ -44,6 +44,7 @@
     "@react-three/fiber": "^9.4.0",
     "@tanstack/react-query": "^5.86.0",
     "@tanstack/react-table": "^8.21.3",
+    "@tanstack/react-virtual": "^3.13.22",
     "@tiptap/core": "^2.27.1",
     "@tiptap/extension-placeholder": "^2.27.1",
     "@tiptap/pm": "^2.27.1",