feat: add bulk actions for workflow operations in media assets (#7992)

## Summary

Add bulk action support for Add to Workflow, Open Workflow, and Export
Workflow when multiple assets are selected.

## Changes

- **What**: Bulk operations for Add to Workflow, Open/Export Workflow in
context menu

## Review Focus

- Node positioning: Multiple nodes created at same canvas center
position (may overlap)
- Context menu item ordering without separators

<img width="1927" height="921" alt="스크린샷 2026-01-13 오후 12 54 52"
src="https://github.com/user-attachments/assets/6f079232-1b24-4f02-810f-6e396916bb71"
/>


┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7992-feat-add-bulk-actions-for-workflow-operations-in-media-assets-2e76d73d365081aa90c6fdb5039c9a3e)
by [Unito](https://www.unito.io)

src/locales/en/main.json

@@ -2414,7 +2414,7 @@
       "zoom": "Zoom in",
       "moreOptions": "More options",
       "seeMoreOutputs": "See more outputs",
-      "addToWorkflow": "Add to current workflow",
+      "insertAsNodeInWorkflow": "Insert as node in workflow",
       "download": "Download",
       "openWorkflow": "Open as workflow in new tab",
       "exportWorkflow": "Export workflow",
@@ -2435,11 +2435,23 @@
       "downloadSelectedAll": "Download all",
       "deleteSelected": "Delete",
       "deleteSelectedAll": "Delete all",
+      "insertAllAssetsAsNodes": "Insert all assets as nodes",
+      "openWorkflowAll": "Open all workflows",
+      "exportWorkflowAll": "Export all workflows",
       "downloadStarted": "Downloading {count} files...",
       "downloadsStarted": "Started downloading {count} file(s)",
       "assetsDeletedSuccessfully": "{count} asset(s) deleted successfully",
       "failedToDeleteAssets": "Failed to delete selected assets",
-      "partialDeleteSuccess": "{succeeded} deleted successfully, {failed} failed"
+      "partialDeleteSuccess": "{succeeded} deleted successfully, {failed} failed",
+      "nodesAddedToWorkflow": "{count} node(s) added to workflow",
+      "failedToAddNodes": "Failed to add nodes to workflow",
+      "partialAddNodesSuccess": "{succeeded} added successfully, {failed} failed",
+      "workflowsOpened": "{count} workflow(s) opened in new tabs",
+      "noWorkflowsFound": "No workflow data found in selected assets",
+      "partialWorkflowsOpened": "{succeeded} workflow(s) opened, {failed} failed",
+      "workflowsExported": "{count} workflow(s) exported successfully",
+      "noWorkflowsToExport": "No workflow data found to export",
+      "partialWorkflowsExported": "{succeeded} exported successfully, {failed} failed"
     },
     "noJobIdFound": "No job ID found for this asset",
     "unsupportedFileType": "Unsupported file type for loader node",