fix(morph): close dialogs properly when removing open attribute

[calebporzio]

Summary

• Morphing a <dialog> that was opened via showModal() would call removeAttribute('open') directly. This hides the dialog visually but leaves it in the browser's top layer, making the entire page permanently inert (unclickable).
• Now detects <dialog> elements and calls dialog.close() instead, which properly exits the top layer.

Changes

packages/morph/src/morph.js — In patchAttributes, when removing the open attribute from a <dialog>:

// Before
from.removeAttribute(name)

// After
if (name === 'open' && from.nodeName === 'DIALOG' && from.open) {
    from.close()
} else {
    from.removeAttribute(name)
}

tests/cypress/integration/plugins/morph.spec.js — Added test that opens a dialog via showModal(), morphs it closed, and verifies the page remains interactive.

Test plan

• Existing morph tests pass (34/34)
• New test: opens dialog with showModal(), morphs to remove open, asserts dialog is closed and page is not inert

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