fix: handle edge-to-edge UI in PaymentRequestActivity

[a1denvalu3]

Summary

Fixes the layout issue in PaymentRequestActivity where content was appearing "shifted up" underneath the system status bar after bumping the target SDK to 35.

Changes

• Applies WindowInsets to android.R.id.content in PaymentRequestActivity's onCreate method to correctly handle padding for the top and bottom system bars now that Android 15 (API level 35) enforces edge-to-edge displays by default.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 20.62%. Comparing base (a69d255) to head (4c401ac).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
.../com/electricdreams/numo/PaymentRequestActivity.kt	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #258      +/-   ##
============================================
- Coverage     20.63%   20.62%   -0.01%     
  Complexity      771      771              
============================================
  Files           145      145              
  Lines         18571    18575       +4     
  Branches       2274     2274              
============================================
  Hits           3832     3832              
- Misses        14256    14260       +4     
  Partials        483      483              

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