Make card error message available to cards loaded by card helpers.

[dcapslock]

Breaking change

Proposed change

With 2025.6 card error changed from being the underlying error to being generic 'Configuration error'. An update allowed for cards in edit/preview mode to see the underlying card error message. This change did not account for cards loaded by card helpers. This PR adds the underlying card error message so it is part of hui-error-card config that is created so can be used by custom elements, and if that custom element loads a card preview, the underlying card error message will be able to be seen.

Custom Elements to benefit from this PR will be Browser Mod (Popup Card Preview) and Auto Entities (will enable a fix to current issues with > 2025.6)

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

No in the box Home Assistant test. Also I don't believe any custom elements correctly use preview, though Browser Mod has a PR to correctly show Popup card config in preview.

The YAML below is using history-graph with empty entities array to simulate an error.

type: grid
cards:
  - type: heading
    heading: Test Card Errors
    heading_style: title
  - type: history-graph
    entities: []
    grid_options:
      columns: full
  - type: custom:popup-card
    title: Custom popup
    dismissable: true
    entity: binary_sensor.ios_virtual
    card:
      type: history-graph
      entities: []

Tested with Browser Mod PR

Without this PR

With this PR

Additional information

• This PR fixes or closes issue: fixes #
• 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

[home-assistant]

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[home-assistant]

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