赵月辉 / fastgpt-migrated

* feat: add chat scroll to bottom button

* fix: refine chat history pagination and scrollbar

* refactor: remove chat scroll button delay

* fix: align chat action buttons

* fix: stop chat auto scroll after user scrolls up

* fix: truncate long chat placeholder app name

* fix: refresh chat history silently after title update

* fix: stabilize chat input placeholder text type