fix(tooltip): handle Window as scroll event target

[kaigritun]

Summary

Fixes #3805

When a scroll event is captured with { capture: true }, the event.target can be Window instead of an HTMLElement. The Window object doesn't have a .contains() method, which causes a TypeError: target?.contains() is not a function error.

Changes

Added an instanceof Node check before calling .contains() to ensure the target is a valid DOM node that supports the method.

Before

const target = event.target as HTMLElement;
if (target?.contains(context.trigger)) onClose();

After

const target = event.target;
// event.target can be Window when scrolling, which doesn't have .contains()
if (target instanceof Node && target.contains(context.trigger)) onClose();

Testing

• All existing tooltip tests pass
• The fix handles the edge case where event.target is Window or Document (neither implements Node)

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[MichaelDeBoey]

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