perf(android): avoid screen and device-type IPC candidates

[marandaneto]

💡 Motivation and Context

Screen autocapture queried ActivityInfo through PackageManager on every Activity.onStart, and device-type detection queried UiModeManager while building static context. Both paths can run on the main thread and can be served from state already loaded in the process. Screen autocapture now uses the activity's current title, so apps that set titles dynamically may emit a different $screen_name for $screen events and change report grouping; this is called out in the changeset.

The network-time candidate was also reviewed. Android already caches the synchronized network-time sample, and reading it does not perform an NTP request. This PR therefore keeps the simpler existing once-per-minute synchronous cache and documents that its occasional cached-value IPC is accepted.

💚 How did you test it?

• make test
• make checkFormat
• Focused unit tests for screen-name compatibility without getActivityInfo and API 28 device-type compatibility

An API 28 Perfetto Binder trace was considered, but no Android device or emulator was connected locally, so this PR does not claim runtime trace verification.

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• I updated the docs if needed.
• No breaking change or entry added to the changelog.

If releasing new changes

• Ran pnpm changeset to generate a changeset file

🤖 Agent context

Autonomy: Human-driven (agent-assisted)

Implemented with the Pi coding agent using repository file, shell, Git, Gradle, and GitHub CLI tools. No shareable agent session link was generated. Activity and UI-mode queries use already-loaded local state instead of adding callback/cache complexity. The proposed asynchronous network-time refresh was rolled back after reviewing AOSP: the OS already caches network time, and the existing once-per-minute synchronous read is the simpler accepted tradeoff. TelephonyManager.networkOperatorName remains unchanged because the callback alternative would require location permission.

[greptile-apps]

Prompt To Fix All With AI

Fix the following 1 code review issue. Work through them one at a time, proposing concise fixes.

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### Issue 1 of 1
posthog-android/src/main/java/com/posthog/android/internal/PostHogAndroidUtils.kt:138
**Runtime titles rename screen events**

When an activity changes its title before `onActivityStarted`, this code emits the mutable runtime title instead of the manifest-defined label previously returned by `ActivityInfo.loadLabel`, causing existing screen events to be renamed or split across analytics dashboards.

_{Reviews (1): Last reviewed commit: "revert: keep synchronous network time ca..." | Re-trigger Greptile}

[ioannisj]

LG Left a discussion point on greptile thread