fix(hover-card): avoid preventDefault in passive event listener

[priyanshuKumar56]

🐛 Bug Description

While investigating shadcn-ui/ui#8777 (Hover Card Touch Error), I found that the root cause originates from @radix-ui/react-hover-card rather than shadcn/ui.

The issue occurs when touching a HoverCardTrigger on mobile or in Chrome’s mobile emulator. Console shows:

Unable to preventDefault inside passive event listener

🔍 Root Cause

@radix-ui/react-hover-card currently calls event.preventDefault() unconditionally inside the trigger’s onTouchStart handler.

In React 19, touch event listeners are now passive by default, so calling preventDefault() throws this warning.

File: packages/react/hover-card/src/HoverCard.tsx Lines: ~93–95

onTouchStart={composeEventHandlers(
  props.onTouchStart,
  (event) => event.preventDefault()
)}

💡 Fix

Guard the call to only execute when the event is cancelable:

- onTouchStart={composeEventHandlers(props.onTouchStart, (event) => event.preventDefault())}
+ onTouchStart={composeEventHandlers(props.onTouchStart, (event) => {
+   if (event.cancelable) {
+     event.preventDefault();
+   }
+ })}

✅ Impact

Removes noisy console warnings in React 19 + Chrome mobile emulation

Maintains existing behavior for React 18 and older

No behavior change for desktop or mouse interactions

🧪 Verification

Tested locally in:

React: 19.2.0

Next.js: 16.0.1

Chrome: 142.0.7444.60 (mobile emulation)

System: macOS (Apple M4)

Result: ✅ No warning message ✅ HoverCard still opens correctly on touch interaction

🔗 Related Issue

Upstream Report: shadcn-ui/ui#8777

Root cause: Radix UI HoverCard

🧱 Summary

Fixes Unable to preventDefault inside passive event listener by checking event.cancelable before calling preventDefault() in HoverCardTrigger

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Latest commit: 6a9fc6c7cec7704912cc17c13d1f25f9d3d7ab81

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