* fix long press on mobile in face and classification
the listener was on the image only, so long pressing on any overlaid div/text area would cause iOS to select the text instead of adding the blue outline
* improve navigation to and from explore
when viewing a tracked object in explore from a classification card, triggers, or the detail stream, explore would open and show a single tracked object. on mobile (noted especially on iOS with frigate in HA), there is no obvious way to navigate back, so add a back button in its usual spot.
also, when going back to the classification view from explore, it may not be obvious which thumbnail you were last viewing, so add a temporary blue outline around the card like review and explore already does
* test tweaks
* basic e2e frontend test framework
* improve mock data generation and add test cases
* more cases
* add e2e tests to PR template
* don't generate mock data in PR CI
* satisfy codeql check
* fix flaky system page tab tests by guarding against crashes from incomplete mock stats
* reduce local test runs to 4 workers to match CI
