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The PR

Title: Add sales tax to invoice calculations Summary: Currently, invoices show line items and totals, but no sales tax. This PR adds tax calculation based on the customer’s location and item categories. Changes:
  • New calculateTax() function that calls a tax rate API
  • Tax amount added to invoice total
  • Invoice template updated to show tax line item

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Factor Analysis

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Verdict

BLOCK_REVIEW
The PR has critical gaps in error handling and validation that must be addressed before merging.
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