v6.6.0

What's Changed

• feat(MessageBar): added custom attach and additional actions by @thatblindgeye in #789
• feat(MessageBar): allowed controlled message value by @thatblindgeye in #798
• docs(design-guidelines): Updates sources guidelines. by @edonehoo in #795
• docs(design-guidelines): Adds guidelines around starting new chats. by @edonehoo in #793
• feat(DeepThinking): added isLoading prop by @thatblindgeye in #801
• feat(Sources): added non-paginated layout by @thatblindgeye in #802
• feat(Messages): added right-aligned and no metadata variants by @thatblindgeye in #805
• fix(ResponseActions): updated action alignment for end aligned message by @thatblindgeye in #807
• feat(messages): fill positive, negative, and copy action icons on click by @wise-king-sullyman in #812
• feat(ResponseActions): added opt-in for hiding actions until interaction by @thatblindgeye in #806
• docs(chatbot): Updates docs to ensure chat history drawer is consistently named. by @edonehoo in #818
• chore: PF team labels and gated Surge PR preview by @nicolethoen in #830
• fix(Misc): updated background and border color tokens by @thatblindgeye in #840
• fix(MessageBar): corrected 6.5 border colors by @thatblindgeye in #842

Full Changelog: v6.5.0...v6.6.0