Fix ArithmeticException crash in div_zero button click handler

[sentry]

Summary\n\nThe div_zero button's click listener in MainActivity contained a hardcoded int t = 5 / 0 that threw an unhandled ArithmeticException, crashing the app.\n\n## Fix\n\nWrap the divide-by-zero operation in a try-catch block so the ArithmeticException is caught and reported to Sentry via Sentry.captureException(e) instead of crashing the app. This follows the same handled-exception pattern already used by the handled_exception button.\n\nFixes ANDROID-K3

[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 (410e6f1) to head (4ce1174).

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    #241   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files         16      16           
  Lines        883     886    +3     
  Branches      67      67           
=====================================
- Misses       883     886    +3     

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