* Add todo list rendering in chat input and update styles

* Refactor todo list rendering logic to use widget position settings and remove deprecated configuration

* Refactor chat input to integrate ChatTodoListWidget and remove unused IChatTodoListService

* Refactor ChatInputPart to remove unused todo state management and improve session handling for todo list widget

* Integrate ChatTodoListWidget into ChatInputPart and update rendering logic in ChatWidget

* Remove redundant todo state reset logic on chat session change in ChatInputPart

* Remove unnecessary blank line in ChatInputPart class

* Simplify condition check for rendering working set in ChatInputPart

* Remove unused CSS rules for chat editing session todos in interactive session