ChangeX v0.1.22

UI polish: the Viewer's Commit graph / Document toggle now sits in a proper dark header bar that lines up with the provenance-timeline header (one clean strip across the top), the segmented control got a macOS-style restyle, and the Open / Change document… button is now clearly legible (it was light-on-white before). No behaviour change — same native Document view + commit graph from v0.1.21.

pip install -U --no-cache-dir "changex[preview]"   # CLI + MCP (unchanged from 0.1.21)
# Desktop app: grab the macOS .dmg / Windows .msi / Linux .AppImage below