test: screenshot test for all activities

[david-allison]

Assisted-by: Claude Opus 4.7 - all

Purpose / Description

• Prep for edge to edge: Forward-port UI to new edge-to-edge for API35 #17334

Approach

The same pattern as ActivityStartupUnderBackupTest

How Has This Been Tested?

./gradlew :AnkiDroid:recordRoborazziPlayDebug -Pscreenshot --tests "com.ichi2.anki.AllActivitiesScreenshotTest"

Checklist

• You have a descriptive commit message with a short title (first line, max 50 chars).
• You have commented your code, particularly in hard-to-understand areas
• You have performed a self-review of your own code
• UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)
• UI Changes: You have tested your change using the Google Accessibility Scanner

[BrayanDSO]

I initially got this from RobolectricDeviceQualifiers.MediumPhone and RobolectricDeviceQualifiers.MediumTablet

Had to use strings in StudyScreenScreenshotTest to parameterize it