Better timeline wrapping

[ihabunek]

• allow user to define desired width
• detect terminal width if possible

[n8willis]

Not sure if this 100% belongs here, but one of the first things I noticed when resizing the terminal window with the TUI active was that the timestamp column stayed full-width while the username column shrank past the point of readability. Seems like being cleverer with "what gets truncated" would help some of those wrapping issues. E.g., drop the YYYY from the timestamp column first, drop the month and day next, drop all timestamps before usernames (since the timeline's sorted chronologically), etc....