[Devin] fix: increment cart count when adding items to cart

[devin-ai-integration]

What

Clicking "Add to Cart" on any product shows a toast notification ("X added to cart") but the cart count in the header never increments — it stays at 0 regardless of how many items are added. The handleAddToCart function never calls setCartCount.

Where

File: app/main.js
Lines: 141–148 (handleAddToCart function)

How I found it

• Browser interaction: Clicked "Add to Cart" on the first product. Toast appeared saying "Shearling Overcoat added to cart" but the header still showed "Cart (0)".
• Static analysis: The handleAddToCart function calls showToast() but never calls setCartCount(c => c + 1).

Evidence

Playwright test output after clicking Add to Cart:

Cart button text after add: Cart (0)

Fix

Added setCartCount(c => c + 1) inside the handleAddToCart callback so the cart count increments each time an item is added.

Confidence

High — Reproducible on every "Add to Cart" click. The fix is a single missing line.

Summary

Adds the missing setCartCount call so the cart count in the header updates when items are added.

Review & Testing Checklist for Human

• Click "Add to Cart" on a product — verify the header cart count increments from 0 to 1
• Add multiple items — verify count increments correctly each time
• Verify the toast notification still appears

Notes

Found via browser interaction — the toast gave the illusion the add-to-cart worked, but the count never updated.

Link to Devin session: https://app.devin.ai/sessions/3b3d59c7eee04cea9069529fd6fff39d
Requested by: @scoobycoder

[devin-ai-integration]

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Project	Deployment	Actions	Updated (UTC)
devin-ai-kata	Ready	Preview, Comment	Apr 26, 2026 7:49pm