showAppDetail() derived the target tab from the legacy ?tab= query
(searchParams.get('tab')), but the app is path-based now
(/app/<name>/<tab>), so that read was always null and defaulted to
'config'. Since loadTabContent() calls showAppDetail() on every switch,
clicking any non-config tab (services/backups/updater/tasks) immediately
rewrote the URL back to /app/<name> and rendered config.
Read the current main tab off the path via appPartsFromPath, honouring
it only when already on this app; cross-app/cold nav still starts at
config. The legacy ?tab= shape is already normalised to the path by the
SPA's handleAppDetail before this runs.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Signed-off-by: librelad <librelad@digitalangels.vip>
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