/app/<name>/config/<sub> URLs (e.g. .../config/ports) are generated by the app
itself and shown in the address bar, but a refresh or deep-link always reset to
the first config category. Cause: showAppDetail() rebuilt the URL via
appPath(appName, targetTab) with NO sub argument and pushState'd it BEFORE
renderAppDetail() read the sub back off the path — so the /<sub> segment was
already gone and preferredCategory stayed null.
Preserve the sub when the URL already points at this app's config (matched by
appPartsFromPath().app === appName), so cold-load/refresh lands on the encoded
sub-tab. Cross-app switches still start at the first category. The sibling
showAppDetailWithConfig() (the grid 'manage' button) is intentionally left to
land on the first category.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Signed-off-by: librelad <librelad@digitalangels.vip>
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