feat: hang detection (ANR) — Android support

[bobbyg603]

Summary

• Bumps com.bugsplat:bugsplat-android 1.2.0 → 1.3.0, which automatically detects and reports historical ANRs via ApplicationExitInfo on Android 11+ each time init() is called (no additional config needed).
• Adds a cross-platform hang() test helper that blocks the native main thread on Android for end-to-end ANR verification. iOS / Expo Go / web log a warning.
• Wires a "Trigger Hang" button into the example app (release-build, Android-only).
• Verified end-to-end on a Pixel 7 API 35 emulator release build — ANR fired, was captured via ApplicationExitInfo, and uploaded by AnrReporter on the next init().

Closes #15.

Draft — awaiting iOS implementation

This PR is kept in draft while iOS hang detection lands upstream in bugsplat-apple. The iOS Swift module currently no-ops hang() with an NSLog, matching the "not yet supported" contract in the TypeScript layer. Once the iOS SDK exposes a hang helper, a follow-up commit on this branch will wire it through and we can mark the PR ready for review.

Test plan

• npm test — 76/76 pass (added hang coverage to native, Expo Go, and web suites)
• npx tsc --noEmit clean
• Release build on Android 15 emulator (google_apis image): tap Init → tap Trigger Hang → system ANR dialog fires → relaunch → ANR report uploaded to BugSplat as crash_type = Android.ANR
• iOS hang verification — pending upstream SDK support

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