v1.2.0

The authentic Disk Inventory X color scheme

The treemap palette is now ported verbatim from Disk Inventory X's FileTypeColors.m: pure blue, red, green, cyan, magenta, yellow — then their light variants — then DIX's grayscale ramp beyond 12 kinds. Colors are assigned by size rank per scan, so the dominant file kind is always blue and the runner-up red, exactly the visual language DIX users know. Treemap cells, outline swatches, Kinds-bar pills, and the inspector all share the same per-window assignment.

Fix: rapid re-scans (clicking a recent while a scan was starting) could kill the fresh scan and show "Scan failed: Scan ended unexpectedly" — two races in scan handoff are closed.

58 unit tests, including exact-value checks against the original palette.