chore: release (#2366)

Author: asvishnyakov

CHANGELOG.md

@@ -4,6 +4,19 @@ 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/).
 
+## [2.6.6] - 2025-08-05
+
+### Added
+- Add support for emoji reaction on message received in Slack
+- Add Greek translation
+- Copy both plain text and rich text to clipboard, if available (rich text pasting to editors like Word)
+- Rename `CHAINLIT_COOKIE_PATH` to `CHAINLIT_AUTH_COOKIE_PATH` and now espect CHAINLIT_ROOT_PATH
+- Add language parameter to Copilot widget configuration
+
+### Fixed
+- Prevent HTML code in user message to be rendered as HTML instead of displaying as code
+- Properly parse `user_env` when `config.project.user_env` is empty
+
 ## [2.6.5] - 2025-08-02
 
 ### Fixed

backend/chainlit/version.py

@@ -5,4 +5,4 @@
 except metadata.PackageNotFoundError:
     # Case where package metadata is not available, default to a 'non-outdated' version.
     # Ref: config.py::load_settings()
-    __version__ = "2.6.5"
+    __version__ = "2.6.6"

backend/pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "chainlit"
-version = "2.6.5"
+version = "2.6.6"
 keywords = [
     'LLM',
     'Agents',