tui: wrapping bugfix

[nornagon-openai]

this fixes an issue where text lines with long words would sometimes overflow.

• the default penalties for the OptimalFit algorithm allow overflowing in some cases. this seems insane to me, and i considered just banning the OptimalFit algorithm by disabling the 'smawk' feature on textwrap, but decided to keep it and just bump the overflow penalty to ~infinity since optimal fit does sometimes produce nicer wrappings. it's not clear this is worth it, though, and maybe we should just dump the optimal fit algorithm completely.
• user history messages weren't rendering with the same wrap algorithm as used in the composer, which sometimes resulted in wrapping messages differently in the history vs. in the composer.