make it easy to delete conversations

[prabirshrestha]

Few ideas that could be implemented:

• Shift+Cmd+W. Close/Delete conversation. Similar to Safari Close Window. I would personally prefer Cmd+Q for Quit and Cmd+W for delete/close conversation.
• Hovering over the conversations on the right pane should show X button to delete.
• Menu to delete all conversations

[psugihara]

I like it! Let's do the first 2 for sure.

I like Cmd+W for delete like safari, but since this is deleting something the user has created, we should always show the confirmation modal we currently show on delete with the delete key.