fix(flashcards): prevent unit page from auto-scrolling to flashcards …

[djoseph-apphelix]

Summary

When a learner navigated to a unit whose first component is a video and second component is a flashcards game, the page automatically scrolled down to the flashcards instead of
staying at the top of the unit. This PR keeps the learner at the top of the unit page.

Problem

• Reported behavior: Navigating into the unit jumps the viewport down to the flashcards, skipping past the video.
• Acceptance criterion: The learner should land at the top of the unit page.

Jira ticket

LP-859

[Copilot]

Pull request overview

This PR addresses LP-859 by preventing the unit page from auto-scrolling down to the Flashcards XBlock on initial load (notably when the unit starts with a video and Flashcards is the next component), keeping learners at the top of the unit as they enter.

Changes:

• Removes the on-load focus call on the Flashcards “Start” button (the trigger for the unwanted unit scroll) while retaining the screen-reader announcement.
• Updates in-game focus behavior to use focus({ preventScroll: true }) when starting the game.
• Adds a regression test to ensure the on-load Start-button focus is not reintroduced and that the on-load announcement remains.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
games/static/js/src/flashcards.js	Stops focusing the Start button on load (prevents unit auto-scroll) and updates focus handling when starting the game.
tests/handlers/test_flashcards_handlers.py	Adds a regression test asserting on-load focus removal and announcement retention.

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