Release v4.40.0

Fixed

• The chat sidebar's "New topic" button now keeps readable text on hover in the dark theme: its hover text color is paired with the hover background, and uses the system Highlight and HighlightText colors in forced-colors mode. (#486)
• Chat mention suggestions can now be dismissed with Escape, which leaves the draft and caret as they were and does not close a dialog around the composer; editing the text after the @ opens them again. (#487)
• The chat message box now exposes the keyboard-highlighted mention option to assistive technology through aria-activedescendant while focus stays in the box. MentionSuggestions accepts an optional id for its list. (#487)