Usage-based app group: limit checks per-app instead of summed usage across the group

[nethical6]

Report

For a usage-based app group, Curbox appears to check the limit against each app individually rather than against the sum of the apps' screen-on-time (SOT) in the group.

Expected

For a usage-based group, the time limit should apply to the combined usage of all apps in the group (sum of their SOTs). Once the group's total hits the limit, every app in the group should be paused/blocked.

Actual

The limit seems to be evaluated per app, so each app gets its own allowance instead of sharing the group's budget.