In the panel view, rank the chats so that the chats that match the most lines are displayd first

step 1: Right now, we store match information in kv_store for each message. This only stores the file that is matched, we should store the number of lines matched.

step 2: Display the lines + context more prominently in the hover message + in the panel. Maybe rank chats in a given file by the number of lines matched?