[Abhishekgit01]

Explanation

Fixes part of #5035

Adds a SplashActivity test for reopening the activity after onboarding state is reset while the app-scoped locale handler remains initialized. It checks that the second launch routes to onboarding and retains the display locale from the first launch.

Essential Checklist

• The PR title starts with Fix part of #5035: ....
• The explanation section above starts with Fixes part of #5035.
• Any changes to scripts/assets files have their rationale included (no such files are changed).
• The PR follows the style guide.
• The PR does not contain unnecessary code changes from Android Studio.
• The PR is made from a branch that's not called develop and is up-to-date with develop (checked against cd3f5f5415ffbda8f7e7730304376bdb571ac2f7 immediately before publication).
• The PR is assigned to the appropriate reviewers. Oppia’s guide says to request a reviewer in a PR comment (e.g. @Reviewer, PTAL) after the PR is created.

Testing

• bazel --batch test --nocache_test_results --test_output=errors //app/src/sharedTest/java/org/oppia/android/app/splash:SplashActivityTest — passed; 135 test cases, zero failures or errors.
• KtLint for SplashActivityTest.kt — passed.
• Repository pre-push checks (KtLint, Checkstyle, Buf, Buildifier) — passed.
• git diff --check — passed.

Disclosure of LLM Usage

• Did you use AI/LLMs when working on this PR? Yes.
• If yes, describe the extent AI was used: AI tools assisted with codebase investigation, the test approach, test implementation, and local verification.