Fix chat TUI line wrapping

[quick-ricon]

Summary

• restore wrapping in the chat TUI view instead of disabling terminal autowrap
• add chat tui --wrap-width <columns> with a default readable width of 100
• wrap rendered message output with fold -s -w and document the new option

Validation

• mise run test -- test/tasks.bats --filter 'task tui:'
• mise run test
• mise run readme -- --check
• mise exec -- codebase lint
• git pre-commit
• git pre-push