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/conversations/_components/chat-panel.tsx

@@ -1,3 +1,5 @@
+// Modified in the independent hardening fork; see docs/hardening/README.md.
+// Modified for AgentDeskFixes: capture operator recipients and preserve failed message drafts.
 "use client";
 
 import {
@@ -61,6 +63,7 @@ import {
   type AIWorkflowRun,
 } from "@/lib/api/admin";
 import { readSession } from "@/lib/auth";
+import { createMessageEditorDraftStore } from "@/lib/message-editor-drafts";
 import { renderIMMessageHTML } from "@/lib/im-message";
 import {
   agentConversationSelectors,
@@ -177,6 +180,8 @@ export function ChatPanel() {
     null,
   );
   const shouldStickToBottomRef = useRef(true);
+  const [draftStore] = useState(createMessageEditorDraftStore);
+  useEffect(() => () => draftStore.clear(), [draftStore]);
   const [claiming, setClaiming] = useState(false);
   const [claimDialogOpen, setClaimDialogOpen] = useState(false);
   const [transferDialogOpen, setTransferDialogOpen] = useState(false);
@@ -314,12 +319,19 @@ export function ChatPanel() {
   };
 
   const handleSend = async (html: string) => {
-    if (!conversation || sending || isClosedConversation) return;
+    // Bind the displayed draft to its recipient before the store reads selection.
+    const recipientId = conversation?.id;
     try {
+      if (!recipientId || sending || isClosedConversation ||
+          useAgentConversationsStore.getState().selectedConversationId !== recipientId) {
+        throw new Error(t("conversation.sendMessageFailed"));
+      }
       shouldStickToBottomRef.current = true;
-      await sendMessage(html);
+      const message = await sendMessage(html, recipientId);
+      if (!message) throw new Error(t("conversation.sendMessageFailed"));
     } catch (error) {
       toast.error(error instanceof Error ? error.message : t("conversation.sendMessageFailed"));
+      throw error;
     }
   };
 
@@ -369,7 +381,7 @@ export function ChatPanel() {
         setWorkflowRunLoading(false);
       }
     },
-    [],
+    [t],
   );
 
   if (!conversation) {
@@ -495,20 +507,28 @@ export function ChatPanel() {
         <div className="flex h-full min-h-0 flex-col">
           <div className="min-h-0 flex-1">
             <AgentMessageEditor
-              disabled={!conversation || sending}
+              draftStore={draftStore}
+              disabled={!conversation}
+              sending={sending}
               uploadingAsset={uploadingAsset}
               onSend={handleSend}
               onUploadImage={async (file) => {
                 shouldStickToBottomRef.current = true;
-                const uploaded = await uploadImage(file);
-                return uploaded;
+                try {
+                  return await uploadImage(file, conversation.id);
+                } catch (error) {
+                  toast.error(error instanceof Error ? error.message : t("upload.imageUploadFailed"));
+                  throw error;
+                }
               }}
               onSendAttachment={async (file) => {
                 shouldStickToBottomRef.current = true;
                 try {
-                  await sendAttachment(file);
+                  const message = await sendAttachment(file, conversation.id);
+                  if (!message) throw new Error(t("conversation.sendAttachmentFailed"));
                 } catch (error) {
                   toast.error(error instanceof Error ? error.message : t("conversation.sendAttachmentFailed"));
+                  throw error;
                 }
               }}
             />