fix(flask): define quantities before length check in checkout

[sentry]

Fixes FRONTEND-REACT-6AX. The issue was that: Flask's checkout function references quantities before assignment, causing UnboundLocalError and subsequent 500 response.

• Moved the initialization of the 'quantities' dictionary to occur before its length is checked.
• Prevents a potential NameError if 'quantities' was accessed before being defined when the cart is empty.

This fix was generated by Seer in Sentry, triggered by prithvirajkumar.rajakumar@sentry.io. 👁️ Run ID: 11422088

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[vercel]

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
empower	Ignored	Preview	Mar 12, 2026 6:20pm

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 22.02%. Comparing base (ea8fa12) to head (fbcbc26).
⚠️ Report is 5 commits behind head on master.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
flask/src/main.py	0.00%	1 Missing ⚠️

❌ Your patch check has failed because the patch coverage (0.00%) is below the target coverage (50.00%). You can increase the patch coverage or adjust the target coverage.
❌ Your project check has failed because the head coverage (22.02%) is below the target coverage (35.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1343      +/-   ##
==========================================
+ Coverage   22.01%   22.02%   +0.01%     
==========================================
  Files          42       42              
  Lines        1363     1362       -1     
  Branches      175      176       +1     
==========================================
  Hits          300      300              
  Misses       1036     1036              
+ Partials       27       26       -1     

Flag	Coverage Δ
api	5.83% <0.00%> (ø)
frontend	32.37% <ø> (+0.03%)	⬆️

Components	Coverage Δ
checkout_module	5.83% <0.00%> (ø)
product_component	26.03% <ø> (+0.04%)	⬆️

Files with missing lines	Coverage Δ
flask/src/main.py	0.00% <0.00%> (ø)

... and 2 files with indirect coverage changes