feat: harden support, localize knowledge and add operator availability [skip ci]

Source-only publication of reviewed commit 64e96a7f423673dc29ad56485be9fc79bce8af1c.

Passed in isolation: focused frontend/backend tests, race checks, TypeScript typecheck, lint, Go compilation, Flowgram build, and deterministic SDK build/tests.

Not accepted as a production release: Next.js export/native assembly remains blocked by environment memory limits; browser interaction and MySQL staging acceptance remain unverified. No production server, database/schema, runtime configuration, deployment, release tag, or workflow execution was performed.

Expected source tree: 0a4a7528e9.

web/components/content-editor/html-editor.tsx

@@ -1,3 +1,4 @@
+// Modified by the independent AgentDesk fork for support reliability and availability.
 "use client"
 
 import {
@@ -196,6 +197,9 @@ export const HtmlEditor = forwardRef<HtmlEditorRef, HtmlEditorProps>(
           />
         ),
       },
+      ...(allowedModes.length > 1
+        ? [{ key: "separator-mode", type: "separator" } as const]
+        : []),
       {
         key: "bold",
         label: t("editor.bold"),
@@ -337,10 +341,6 @@ export const HtmlEditor = forwardRef<HtmlEditorRef, HtmlEditorProps>(
       },
     ]
 
-    if (allowedModes.length > 1) {
-      actions.splice(1, 0, { key: "separator-mode", type: "separator" })
-    }
-
     if (!editor) {
       return null
     }