fix: navigate buy modal with arrow keys

frontend/src/components/modals/ConfirmBuyModal.jsx

@@ -1,4 +1,4 @@
-import { useEffect, useState } from "react";
+import { useCallback, useEffect, useState } from "react";
 import "../../styles/ConfirmBuyModal.css";
 
 function ChevronIcon({ direction }) {
@@ -27,17 +27,6 @@ export default function ConfirmBuyModal({
     setIsSubmitting(false);
   }, [item.id, item.quantity]);
 
-  useEffect(() => {
-    const handleKeyDown = (event) => {
-      if (event.key === "Escape" && !isSubmitting) {
-        onCancel();
-      }
-    };
-
-    window.addEventListener("keydown", handleKeyDown);
-    return () => window.removeEventListener("keydown", handleKeyDown);
-  }, [isSubmitting, onCancel]);
-
   const currentIndex = allItems.findIndex((listItem) => listItem.id === item.id);
   const hasPrev = currentIndex > 0;
   const hasNext = currentIndex < allItems.length - 1;
@@ -65,21 +54,46 @@ export default function ConfirmBuyModal({
     }
   };
 
-  const handlePrev = () => {
+  const handlePrev = useCallback(() => {
     if (isSubmitting) return;
 
     if (hasPrev && onNavigate) {
       onNavigate(allItems[currentIndex - 1]);
     }
-  };
+  }, [allItems, currentIndex, hasPrev, isSubmitting, onNavigate]);
 
-  const handleNext = () => {
+  const handleNext = useCallback(() => {
     if (isSubmitting) return;
 
     if (hasNext && onNavigate) {
       onNavigate(allItems[currentIndex + 1]);
     }
-  };
+  }, [allItems, currentIndex, hasNext, isSubmitting, onNavigate]);
+
+  useEffect(() => {
+    const handleKeyDown = (event) => {
+      if (isSubmitting) return;
+
+      if (event.key === "Escape") {
+        onCancel();
+        return;
+      }
+
+      if (event.key === "ArrowLeft") {
+        event.preventDefault();
+        handlePrev();
+        return;
+      }
+
+      if (event.key === "ArrowRight") {
+        event.preventDefault();
+        handleNext();
+      }
+    };
+
+    window.addEventListener("keydown", handleKeyDown);
+    return () => window.removeEventListener("keydown", handleKeyDown);
+  }, [handleNext, handlePrev, isSubmitting, onCancel]);
 
   const imageUrl = item.item_image && item.image_mime_type
     ? `data:${item.image_mime_type};base64,${item.item_image}`

frontend/tests/location-map-manager.spec.ts

@@ -3670,6 +3670,10 @@ test("viewer can buy selected zone items from the map", async ({ page }) => {
   expect(nextItemButtonBox.height).toBeGreaterThanOrEqual(40);
   await nextItemButton.click();
   await expect(page.locator(".confirm-buy-item-name")).toHaveText("sourdough");
+  await page.keyboard.press("ArrowLeft");
+  await expect(page.locator(".confirm-buy-item-name")).toHaveText("french bread");
+  await page.keyboard.press("ArrowRight");
+  await expect(page.locator(".confirm-buy-item-name")).toHaveText("sourdough");
   const previousItemButton = page.getByRole("button", { name: "Previous item" });
   const previousItemButtonBox = await previousItemButton.boundingBox();
   expect(previousItemButtonBox).not.toBeNull();