Fix backdrop dismiss on iOS by replacing closedBy property with getAttribute

[Copilot]

• Fix iOS Safari compatibility: replace popup.closedBy with popup.getAttribute('closedby') in src/view.js
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Original prompt

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This section details on the original issue you should resolve

<issue_title>Cannot tap backdrop to dismiss on iOS, dialog.closedBy not supported</issue_title>
<issue_description>Unfortunately dialog.closedBy is not supported by iOS, so the conditional which we use to check whether we need to apply a manual click close event never passes on that platform. We need an interim solution to permit tapping the backdrop to dismiss on safar.</issue_description>

<agent_instructions>Reimplement the close logic to avoid this safari incompatibility as cleanly as possible.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Cannot tap backdrop to dismiss on iOS, dialog.closedBy not supported #9

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[github-actions]

Playwright E2E Test Results (PHP 8.4, WP latest)

 20 passed

Details

 20 tests across 3 suites
 2 minutes, 21 seconds
 fb286bd