BUGFIX: Nodes show action does not handle \JsonSerializable objects and crashes if object is not StringAble

[mhsdesign]

With neos/neos-ui#3723 and neos/neos-ui#3723 the NodePropertyConverterService returns \JsonSerializable objects directly in the expectation that they are serialized directly. This is also true for the usages within the Neos Ui.

But this legacy endpoint here in Neos doesnt do it. And throws

"Object of class Sitegeist\Archaeopteryx\Link could not be converted to string"

on some occasions whenever the endoint is used. Funnely the Neos Ui really does not care about the node properties rendered here via fluid in html so we could also return "nudelsuppe" here. Its just important that it not crashes.

neos-development-collection/Neos.Neos/Resources/Private/Templates/Service/Nodes/Show.html

Lines 30 to 35 in 1aeef6c

	<f:for each="{convertedNodeProperties}" as="value" key="name">
	<tr class="node-property">
	<th class="node-property-name">{name}</th>
	<td class="node-property-value">{value}</td>
	</tr>
	</f:for>

In the future we should have this whole thing killed :D

Upgrade instructions

Review instructions

Checklist

• Code follows the PSR-2 coding style
• Tests have been created, run and adjusted as needed
• The PR is created against the lowest maintained branch
• Reviewer - PR Title is brief but complete and starts with FEATURE|TASK|BUGFIX
• Reviewer - The first section explains the change briefly for change-logs
• Reviewer - Breaking Changes are marked with !!! and have upgrade-instructions

[mhsdesign]

See also report in slack https://neos-project.slack.com/archives/C04PYL8H3/p1765379093714569

This fix is especially important for 9.1 as well have a native non stringalbe but jsonserializeable link value object: #5682

[nezaniel]

yep