chore/release (#2676)

<!-- This is an auto-generated description by cubic. -->
## Summary by cubic
Release 2.9.1: bumps the package version and updates the changelog for
new features and broader test coverage.

- **New Features**
  - Tabs in chat settings
  - Markdown support in watermark
  - Italian translation added
  - Chat prefill via query param
- Expanded tests across core modules (utils, markdown, sidebar, chat
settings, MCP, input widget, LangChain, elements, steps, actions)

<sup>Written for commit 4fad436.
Summary will update automatically on new commits.</sup>

<!-- End of auto-generated description by cubic. -->

Author: hayescode

CHANGELOG.md

@@ -4,6 +4,16 @@ All notable changes to Chainlit will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
+## [2.9.1] - 2025-11-20
+
+### Added
+- Add support for tabs in chat settings
+- Support markdown in watermark
+- Add italian translation to translations folder
+- Add query param prefill for chat
+- Add tests for utils, markdown, sidebar, chat settings, mcp, input widget, langchain, elements, steps, and actions
+
+
 ## [2.9.0] - 2025-11-06
 
 ### Added
@@ -13,6 +23,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 
 ## [2.8.5] - 2025-11-07
+
 ### Added
 - Add display_name to ChatProfile
 - Add slack reaction event callback

backend/chainlit/version.py

@@ -1 +1 @@
-__version__ = "2.9.0"
+__version__ = "2.9.1"