v0.1.3 — progress bar fits narrow terminals

Fixes the --progress bar leaving a trail of lines on narrow terminals:

• The bar line was padded to a fixed 90 columns, so terminals narrower than that wrapped every redraw onto a new line. Each frame is now sized to the actual terminal width (re-checked live, so resizing mid-run works too).
• On narrow terminals the bar segment shrinks first, keeping percent, elapsed, and ETA visible down to very small widths.
• Falls back to 80 columns when stderr is not a terminal.

No format or compression changes — archives are fully compatible. Update with dnz update.

Full Changelog: v0.1.2...v0.1.3