Picture elements position by click

[MindFreeze]

Proposed change

Continued from #25668

UI is the same but the technical implementation is new.

The only reliable link we have between the editor and the preview is the config. So I added a callback to it that the card can use to send data back.
It's added with a symbol so it is completely ignored during serialization. deepEqual also ignored symbols so I added a new option for them.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example configuration

Additional information

• This PR fixes or closes issue: fixes Finish picture elements position PR (#25668) #27692
• This PR is related to issue or discussion:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

[karwosts]

This is kinda broken for conditional elements.

When editing the conditional itself, it instructs you to click, but clicking adds the style to the conditional which isn't supported, and leave you with a config error and broken UI.

When editing the child element of a conditional, it still attach the click style to the parent conditional, and not the child, causing same problem.

Otherwise very cool 😎

[MindFreeze]

Nice catch. I just excluded conditional elements for now. We can deal with them later. Also fixed an existing error with the stub config for conditionals