fix: restore isnew handling and frontend dockerfile path

Makefile

@@ -279,7 +279,7 @@ docker-publish:
 	@echo "=========================================="
 	@IMAGE=registry.xueai.art/deerflow/deerflow-$(SVC):$(VER); \
 	DOCKERFILE=$$(case "$(SVC)" in \
-		frontend) echo "frontend/Dockerfile.prod";; \
+		frontend) echo "frontend/Dockerfile";; \
 		gateway) echo "backend/Dockerfile";; \
 		langgraph) echo "backend/Dockerfile";; \
 		*) echo "";; \
@@ -302,4 +302,4 @@ docker-publish:
 			exit 1; \
 		fi; \
 		echo "✓ Docker image $$IMAGE built and pushed successfully"; \
-	fi
+	fi

frontend/src/app/workspace/chats/[thread_id]/page.tsx

@@ -1,6 +1,7 @@
 "use client";
 
 import { FilesIcon, ListTodoIcon, XIcon } from "lucide-react";
+import { useSearchParams } from "next/navigation";
 import { useCallback, useEffect, useMemo, useState } from "react";
 
 import { ConversationEmptyState } from "@/components/ai-elements/conversation";
@@ -54,6 +55,20 @@ export default function ChatPage() {
     fullscreen,
   } = useArtifacts();
   const { threadId, isNewThread, setIsNewThread, isMock } = useThreadChat();
+  const searchParams = useSearchParams();
+
+  // Submission strategy is controlled by `isnew` query param only.
+  // - isnew=false: reuse existing thread
+  // - otherwise: create/start a new session
+  const createNewSession = useMemo(() => {
+    if (!isNewThread) {
+      return false;
+    }
+    return searchParams.get("isnew")?.trim().toLowerCase() !== "false";
+  }, [isNewThread, searchParams]);
+  const streamThreadId = useMemo(() => {
+    return isNewThread && createNewSession ? undefined : threadId;
+  }, [createNewSession, isNewThread, threadId]);
 
   const { showNotification } = useNotification();
 
@@ -64,7 +79,7 @@ export default function ChatPage() {
     isBootstrapping: isSelectedSkillBootstrapping,
   } = useSelectedSkillListener({ threadId });
   const [thread, sendMessage, isUploading] = useThreadStream({
-    threadId: isNewThread ? undefined : threadId,
+    threadId: streamThreadId,
     context: settings.context,
     isMock,
     onStart: (currentThreadId) => {

frontend/src/components/workspace/chats/use-thread-chat.ts

@@ -11,7 +11,14 @@ export function useThreadChat() {
 
   const searchParams = useSearchParams();
   const [threadId, setThreadId] = useState(() => {
-    return threadIdFromPath === "new" ? uuid() : threadIdFromPath;
+    if (threadIdFromPath === "new") {
+      const shouldUseQueryThreadId = pathname.startsWith("/workspace/chats/");
+      const queryThreadId = shouldUseQueryThreadId
+        ? searchParams.get("thread_id")?.trim()
+        : undefined;
+      return queryThreadId ?? uuid();
+    }
+    return threadIdFromPath;
   });
 
   const [isNewThread, setIsNewThread] = useState(
@@ -21,9 +28,16 @@ export function useThreadChat() {
   useEffect(() => {
     if (pathname.endsWith("/new")) {
       setIsNewThread(true);
-      setThreadId(uuid());
+      const shouldUseQueryThreadId = pathname.startsWith("/workspace/chats/");
+      const queryThreadId = shouldUseQueryThreadId
+        ? searchParams.get("thread_id")?.trim()
+        : undefined;
+      setThreadId(queryThreadId ?? uuid());
+      return;
     }
-  }, [pathname]);
+    setIsNewThread(false);
+    setThreadId(threadIdFromPath);
+  }, [pathname, searchParams, threadIdFromPath]);
   const isMock = searchParams.get("mock") === "true";
   return { threadId, isNewThread, setIsNewThread, isMock };
 }