[Bug] [web] new task button and auto-refresh sidebar dialogue list

Search before asking

• I had searched in the issues and found no similar issues.

Operating system information

Linux

Python version information

=3.11

DB-GPT version

main

Related scenes

• Chat Data
• Chat Excel
• Chat DB
• Chat Knowledge
• Model Management
• Dashboard
• Plugins

Installation Information

• Installation From Source

• Docker Installation

• Docker Compose Installation

• Cluster Installation

• AutoDL Image

• Other

Device information

M2

Models information

LLM: claude-sonnet-4.6 embedding：text-embedding-v4

What happened

Two UX bugs in the ReAct agent chat page:

1. The "New Task" button in the sidebar does nothing when the user is already on the / page. Clicking it should reset the conversation state and start a fresh session, but since it's a plain , no navigation event fires and the page stays unchanged.

2. After completing a conversation, the new dialogue never appears in the sidebar "All Tasks" list automatically. The user has to manually refresh the page to see it.

What you expected to happen

1. Clicking "New Task" should always clear the current conversation and prepare a blank input, regardless of the current route.

2. After a conversation is created, it should appear in the sidebar dialogue list immediately without requiring a page refresh.

How to reproduce

1. Open the ReAct agent chat page (/)
2. Send any message and wait for the response
3. Click "New Task" in the sidebar — nothing happens (bug 1)
4. Observe the sidebar "All Tasks" list — the new conversation is missing (bug 2)
5. Manually refresh the page — the conversation now appears

Additional context

No response

Are you willing to submit PR?

• Yes I am willing to submit a PR!