Guard div_zero button against fatal ArithmeticException

[sentry]

Fixes ANDROID-M0

Problem

Tapping the div_zero ("ArithmeticException") button in MainActivity executed a hardcoded int t = 5 / 0; inside the click listener (MainActivity.java:53). There was no try/catch around it, so the ArithmeticException propagated out of lambda$onCreate$0 unhandled and the app crashed fatally.

Fix

The division is kept so the demo still exercises the error path, but it is now wrapped in a try/catch (ArithmeticException e) that reports the error via Sentry.captureException(e) — matching the pattern already used by the handled_exception button in the same activity.

try {
    int divisor = 0;
    int t = 5 / divisor;
} catch (ArithmeticException e) {
    Sentry.captureException(e);
}

The divisor is held in a local variable rather than a 0 literal so javac does not emit a division-by-zero warning; the runtime behaviour (ArithmeticException: / by zero) is identical.

The existing breadcrumb and attachment setup is unchanged, so the Sentry event carries the same context as before — it now arrives as a handled error instead of a fatal crash. The surrounding comment was updated from "Unhandled" to "Handled" to reflect the new behaviour.

Verification

• Confirmed the modified MainActivity.java has no syntax errors (javac reports only expected missing Android/Sentry/Gradle-generated symbols, as no Android SDK is available in this environment).
• Ran a standalone reproduction of the new listener body: the ArithmeticException: / by zero is thrown, caught, and routed to the capture path with no fatal propagation.

[sentry]

📲 Install Builds

Android

🔗 App Name	App ID	Version	Configuration
Android	com.example.vu.android	24.12.26 (241226)	release
Android	com.example.vu.android	24.12.26 (241226)	debug
Android	com.example.vu.android	24.12.26 (241226)	release

⚙️ android Build Distribution Settings

[codecov]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 0.00%. Comparing base (2bef372) to head (dd2582e).

Files with missing lines	Patch %	Lines
...main/java/com/example/vu/android/MainActivity.java	0.00%	5 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #249   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files         16      16           
  Lines        883     887    +4     
  Branches      67      67           
=====================================
- Misses       883     887    +4     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.