Adjust Play Store URLs and add local data source tests

[MihaiCristianCondrea]

Summary

• return the Play Store base URL from DefaultHomeLocalDataSource and guard against null package names
• add unit tests under data/source/local covering base, empty, and null package names plus the daily tip behavior

Testing

• ./gradlew test (fails: Android SDK not configured in CI environment)

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https://chatgpt.com/codex/tasks/task_e_68c976316340832da4917f85b05a48f7

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[chatgpt-codex-connector]

[P1] Returning base Play Store URL breaks app listing intent

The new getPlayStoreUrl() now returns only "https://play.google.com/store/apps/details?id=" without a package ID. HomeViewModel.getOpenPlayStoreIntent() uses this value directly to build the intent launched from the Home screen’s “Google Play” button, so after this change tapping the button will open a generic Play Store page (or an error) instead of the app’s listing (com.d4rk.androidtutorials). This is a functional regression; the method should still include the app’s package name, for example by appending a constant or the runtime package name.

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