fix: prevent dialog/fullsize-dialog plugins from closing immediately after page load

[usman-khalid]

Description

Opening a dialog or fullsize-dialog plugin within the first ~2-3 seconds of page load causes it to appear briefly then close on its own.

handleLibSwitch used standalone render() into the shadow root, which conflicted with LitElement's own rendering. Async re-renders (e.g. from checkPreviewStatus) overwrote the dialog, closing it. Fixed by rendering the dialog through LitElement's reactive cycle instead.

How Has This Been Tested?

Tested on localhost, https://library--da-live--usman-khalid.aem.page/ and with browser override on da.live

Screenshots (if appropriate):

N/A

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[aem-code-sync]

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[auniverseaway]

I've got a more substantial fix for this already in the works. I'll send a PR this morning for you to look at.