Video support and group improvements

You can now import and chat with YouTube videos and uploaded MP4 files. This includes timestamp referencing so you can easily skip to relevant parts of the video.

Improvements

• Moved the language selector from settings into the Chat input and added a search dropdown so it’s easier to choose a language.
• Group page references in Chat now appear inline with the responses, similar to how they work when interacting with a single source.
• Added MP4 filetype support to the site-wide drag and drop import functionality.
• Rebuilt pane window resizing for more performant smoother resizing.
• Vast improvement to Group answers. Our language models now have a much better idea of what information came from which document.

Fixes

• Fixed a bug where code blocks were being incorrectly formatted in Markdown. Inline code snippets were being treated as code blocks.