build: bump compileSdk/targetSdk to 36 (Android 16)

[ErikBjare]

Part of Play Store policy compliance: App must target Android 16 (API level 36) or higher — Fix by Aug 31 (Play Console warning, ~3 weeks away).

The app already targets API 35, so the significant behavior changes from that generation (edge-to-edge enforcement etc.) are already absorbed. Targeting 36 mainly picks up stricter intent matching and predictive-back defaults, neither of which this app relies on.

CI's emulator E2E (API 29) plus unit tests cover the regression risk; a manual smoke test on an Android 16 device before the next Play release is still advisable.

Sibling PRs for the other Play policy items: #213 (16 KB pages); accessibility prominent disclosure to follow.

[ErikBjare]

@greptileai review

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[greptile-apps]

Greptile Summary

This PR updates the Android module to compile against and target API level 36 for Play Store policy compliance.

• Raises compileSdk from 35 to 36.
• Raises targetSdkVersion from 35 to 36.

Confidence Score: 5/5

The PR appears safe to merge, with no concrete blocking or independently actionable issue identified in the SDK-level update.

The compile and target SDK values remain aligned, and the repository uses a modern Android Gradle Plugin and Gradle toolchain compatible with the updated configuration.

Important Files Changed

Filename	Overview
mobile/build.gradle	Updates the compile and target SDK levels together; no concrete defect was identified in the changed configuration.

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