fix: guard openInEditor when inspector is unavailable

When the component inspector is not initialized, calling openInEditor through the Vite plugin path throws because __VUE_INSPECTOR__ is missing.

Guard the call and log a clear warning instead, so DevTools does not crash in this state.

Refs #824

Author: Akur1a

packages/devtools-kit/src/core/open-in-editor/index.ts

@@ -29,7 +29,12 @@ export function openInEditor(options: OpenInEditorOptions = {}) {
     }
     else if (devtoolsState.vitePluginDetected) {
       const _baseUrl = target.__VUE_DEVTOOLS_OPEN_IN_EDITOR_BASE_URL__ ?? baseUrl
-      target.__VUE_INSPECTOR__.openInEditor(_baseUrl, file, line, column)
+      if (target.__VUE_INSPECTOR__) {
+        target.__VUE_INSPECTOR__.openInEditor(_baseUrl, file, line, column)
+      }
+      else {
+        console.warn('[Vue DevTools] Component inspector is not available. If you have disabled the Options API, the component inspector may not be initialized.')
+      }
     }
   }
 }