Fix ArithmeticException crash on div_zero button tap

[sentry]

Summary

The div_zero button's click listener in MainActivity.java contained a hardcoded int t = 5 / 0 that threw an unhandled ArithmeticException, crashing the app every time the button was tapped.

Fix

Wrapped the division in a try-catch(ArithmeticException) block and report the exception to Sentry via Sentry.captureException(e), consistent with the existing handled-exception pattern used elsewhere in the same file.

How to verify

1. Launch the app (com.example.vu.android).
2. Navigate to MainActivity.
3. Tap the div_zero button.
4. The app no longer crashes — the exception is captured and reported to Sentry.

Fixes ANDROID-HX

[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 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 0.00%. Comparing base (fbd7a20) to head (66a29ec).

Files with missing lines	Patch %	Lines
...main/java/com/example/vu/android/MainActivity.java	0.00%	4 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #229   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files         16      16           
  Lines        875     878    +3     
  Branches      65      65           
=====================================
- Misses       875     878    +3     

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