Contextmenu extension migration (#5993)

This pull request refactors how context menu items are contributed by
extensions in the LiteGraph-based canvas. The legacy monkey-patching
approach for adding context menu options is replaced by a new, explicit
API (`getCanvasMenuItems` and `getNodeMenuItems`) for extensions. A
compatibility layer is added to support legacy extensions and warn
developers about deprecated usage. The changes improve maintainability,
extension interoperability, and migration to the new context menu
system.

### Context Menu System Refactor

* Introduced a new API for extensions to contribute context menu items
via `getCanvasMenuItems` and `getNodeMenuItems` methods, replacing
legacy monkey-patching of `LGraphCanvas.prototype.getCanvasMenuOptions`.
Major extension files (`groupNode.ts`, `groupOptions.ts`,
`nodeTemplates.ts`) now use this new API.
[[1]](diffhunk://#diff-b29f141b89433027e7bb7cde57fad84f9e97ffbe5c58040d3e0fdb7905022917L1779-R1771)
[[2]](diffhunk://#diff-91169f3a27ff8974d5c8fc3346bd99c07bdfb5399984484630125fdd647ff02fL232-R239)
[[3]](diffhunk://#diff-04c18583d2dbfc013888e4c02fd432c250acbcecdef82bf7f6d9fd888e632a6eL447-R458)
* Added a compatibility layer (`legacyMenuCompat` in
`contextMenuCompat.ts`) to detect and warn when legacy monkey-patching
is used, and to extract legacy-added menu items for backward
compatibility.
[[1]](diffhunk://#diff-2b724cb107c04e290369fb927e2ae9fad03be9e617a7d4de2487deab89d0d018R2-R45)
[[2]](diffhunk://#diff-d3a8284ec16ae3f9512e33abe44ae653ed1aa45c9926485ef6270cc8d2b94ae6R1-R115)

### Extension Migration

* Refactored core extensions (`groupNode`, `groupOptions`, and
`nodeTemplates`) to implement the new context menu API, moving menu item
logic out of monkey-patched methods and into explicit extension methods.
[[1]](diffhunk://#diff-b29f141b89433027e7bb7cde57fad84f9e97ffbe5c58040d3e0fdb7905022917L1633-L1683)
[[2]](diffhunk://#diff-91169f3a27ff8974d5c8fc3346bd99c07bdfb5399984484630125fdd647ff02fL19-R77)
[[3]](diffhunk://#diff-04c18583d2dbfc013888e4c02fd432c250acbcecdef82bf7f6d9fd888e632a6eL366-R373)

### Type and Import Cleanup

* Updated imports for context menu types (`IContextMenuValue`) across
affected files for consistency with the new API.
[[1]](diffhunk://#diff-b29f141b89433027e7bb7cde57fad84f9e97ffbe5c58040d3e0fdb7905022917R4-L7)
[[2]](diffhunk://#diff-91169f3a27ff8974d5c8fc3346bd99c07bdfb5399984484630125fdd647ff02fL1-R11)
[[3]](diffhunk://#diff-04c18583d2dbfc013888e4c02fd432c250acbcecdef82bf7f6d9fd888e632a6eL2-R6)
[[4]](diffhunk://#diff-bde0dce9fe2403685d27b0e94a938c3d72824d02d01d1fd6167a0dddc6e585ddR10)

### Backward Compatibility and Migration Guidance

* The compatibility layer logs a deprecation warning to the console when
legacy monkey-patching is detected, helping developers migrate to the
new API.

---

These changes collectively modernize the context menu extension
mechanism, improve code clarity, and provide a migration path for legacy
extensions.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5993-Contextmenu-extension-migration-2876d73d3650813fae07c1141679637a)
by [Unito](https://www.unito.io)

---------

Co-authored-by: github-actions <github-actions@github.com>

src/services/extensionService.ts

@@ -1,5 +1,6 @@
 import { useCurrentUser } from '@/composables/auth/useCurrentUser'
 import { useErrorHandling } from '@/composables/useErrorHandling'
+import { legacyMenuCompat } from '@/lib/litegraph/src/contextMenuCompat'
 import { useSettingStore } from '@/platform/settings/settingStore'
 import { api } from '@/scripts/api'
 import { app } from '@/scripts/app'
@@ -136,8 +137,25 @@ export const useExtensionService = () => {
       extensionStore.enabledExtensions.map(async (ext) => {
         if (method in ext) {
           try {
-            return await ext[method](...args, app)
+            // Set current extension name for legacy compatibility tracking
+            if (method === 'setup') {
+              legacyMenuCompat.setCurrentExtension(ext.name)
+            }
+
+            const result = await ext[method](...args, app)
+
+            // Clear current extension after setup
+            if (method === 'setup') {
+              legacyMenuCompat.setCurrentExtension(null)
+            }
+
+            return result
           } catch (error) {
+            // Clear current extension on error too
+            if (method === 'setup') {
+              legacyMenuCompat.setCurrentExtension(null)
+            }
+
             console.error(
               `Error calling extension '${ext.name}' method '${method}'`,
               { error },

src/services/litegraphService.ts

@@ -658,7 +658,6 @@ export const useLitegraphService = () => {
       return [
         {
           content: 'Copy Image',
-          // @ts-expect-error: async callback is not accepted by litegraph
           callback: async () => {
             const url = new URL(img.src)
             url.searchParams.delete('preview')