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/app/(dashboard)/dashboard/knowledge/_components/knowledge-bulk-move-dialog.tsx

@@ -1,3 +1,4 @@
+// Modified by the independent AgentDesk fork for support reliability and availability.
 "use client";
 
 import { useEffect, useMemo, useState } from "react";
@@ -42,26 +43,41 @@ export function KnowledgeBulkMoveDialog({
   onSubmit,
 }: KnowledgeBulkMoveDialogProps) {
   const t = useI18n();
-  const [directories, setDirectories] = useState<KnowledgeDirectory[]>([]);
+  const [directoryResult, setDirectoryResult] = useState<{
+    knowledgeBaseId: number;
+    directories: KnowledgeDirectory[];
+  }>({ knowledgeBaseId, directories: [] });
   const [targetDirectoryId, setTargetDirectoryId] = useState("0");
+  const [selectionScope, setSelectionScope] = useState({ knowledgeBaseId, open });
+
+  // A new base or dialog opening is a new selection session. Reset before the
+  // children render, rather than exposing the previous target for one frame.
+  if (selectionScope.knowledgeBaseId !== knowledgeBaseId || selectionScope.open !== open) {
+    setSelectionScope({ knowledgeBaseId, open });
+    setTargetDirectoryId("0");
+  }
 
   useEffect(() => {
     if (!open) {
       return;
     }
-    setTargetDirectoryId("0");
+    let active = true;
     fetchKnowledgeDirectories(knowledgeBaseId)
-      .then(setDirectories)
+      .then((result) => {
+        if (active) setDirectoryResult({ knowledgeBaseId, directories: result });
+      })
       .catch((error) => {
+        if (!active) return;
         console.error(error);
-        setDirectories([]);
+        setDirectoryResult({ knowledgeBaseId, directories: [] });
       });
+    return () => { active = false; };
   }, [knowledgeBaseId, open]);
 
   const directoryOptions = useMemo(() => [
     { value: "0", label: t("knowledge.rootContent") },
-    ...flattenDirectoryOptions(directories),
-  ], [directories, t]);
+    ...flattenDirectoryOptions(directoryResult.knowledgeBaseId === knowledgeBaseId ? directoryResult.directories : []),
+  ], [directoryResult, knowledgeBaseId, t]);
 
   return (
     <ProjectDialog