The wizard's Storage step builds its first entry from primaryRoot() — the
app-data root — and labelled it "System disk". On a default install those are
the same drive and the name is honest. Installed with --containers-dir on its
own disk they are not, and the step then showed the DATA drive's size under the
system disk's name while the actual system disk never appeared in the list.
Seen on a matrix case-2 install (apps on a 29.4G test disk, system on a 912G
root): "System disk — 26.7G free of 29.4G".
The generator now reports whether that root is really on the OS disk
(is_os_disk, by st_dev against /), and the wizard labels it from that: "System
disk" when they coincide, otherwise the mount point. The "system" badge stays —
it marks the default location, which is still what it is.
Also add lp-shot --token / --cookie-js. A screenshot answers "does it render";
"does this wizard step work" needs clicking, which needs a real browser, which
needs the session lp-shot already knows how to mint from the stored jwtSecret.
This bug was found that way.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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