Fix: Only call processDeliveryItem on successful checkout response

[sentry]

Summary

Fixes a bug where processDeliveryItem() was called in the failure paths of the checkout HTTP callback, causing BackendAPIException: Failed to init delivery workflow to be thrown after an already-failed checkout.

Root Cause

The checkout flow in MainFragment.java had its success/failure logic inverted:

• Before: processDeliveryItem() was called when !response.isSuccessful() (failure) and in onFailure() (network error), but never on success.
• After: processDeliveryItem() is called only when response.isSuccessful() (success), and removed from both failure paths.

When the Flask backend returns HTTP 500 (e.g., due to an UnboundLocalError on the quantities variable), the Android app was proceeding to call processDeliveryItem(), which always throws BackendAPIException("Failed to init delivery workflow") — compounding the error.

Changes

MainFragment.java — checkout() method:

• Moved processDeliveryItem(checkoutTransaction) from the !success branch to the success branch in onResponse
• Removed processDeliveryItem() call from onFailure
• Transaction now finishes with SpanStatus.OK on success, SpanStatus.INTERNAL_ERROR on failure

Fixes ANDROID-FZ

[codecov]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 0.00%. Comparing base (814e302) to head (e340e18).

Files with missing lines	Patch %	Lines
.../example/vu/android/empowerplant/MainFragment.java	0.00%	4 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #220   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files         16      16           
  Lines        864     863    -1     
  Branches      65      65           
=====================================
+ Misses       864     863    -1     

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