Various commenting improvements (#4938)

* fix: New threads attached to previous as replies

* fix: Cannot use floating toolbar properly in comments

* perf: Avoid re-writing history on click in editor

* fix: Comment on text selection

* fix: 'Copy link' on comments uses wrong hostname

* Show comment buttons on input focus rather than non-empty input
Increase maximum sidebar size

* Allow opening comments from document menu

* fix: Clicking comment menu should not focus thread

app/editor/components/ToolbarButton.tsx

@@ -2,7 +2,9 @@ import styled from "styled-components";
 
 type Props = { active?: boolean; disabled?: boolean };
 
-export default styled.button<Props>`
+export default styled.button.attrs((props) => ({
+  type: props.type || "button",
+}))<Props>`
   display: inline-block;
   flex: 0;
   width: 24px;