Add background editor to dashboard detail editor

[timmo001]

Breaking change

Proposed change

This feature has been available for a while. You can add the background block in yaml, there is just no visual editor. I couldn't find a reason why it isn't in the dashboard detail editor already.

Adds a background tab to the editor (when in edit, not new dashboard). Reuses styling and components from the view editor.

Came from a discussion in discord here: https://discord.com/channels/330944238910963714/1475552784278360176/1495790069720813669

Screenshots

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

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue or discussion:
• Link to documentation pull request:
• Link to developer documentation pull request:
• Link to backend pull request:

Checklist

• I understand the code I am submitting and can explain how it works.
• The code change is tested and works locally.
• There is no commented out code in this PR.
• I have followed the perfect PR recommendations
• Any generated code has been carefully reviewed for correctness and compliance with project standards.

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

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

To help with the load of incoming pull requests:

• I have reviewed two other open pull requests in this repository.

[piitaya]

IMO, we should propose a list of pre-defined background and color, and allow user to upload their own background. The background editor is too complex for the audience we want to target with this dashboard.
The background image should be :

• always fill view
• always center
• no repeat

[timmo001]

IMO, we should propose a list of pre-defined background and color, and allow user to upload their own background. The background editor is too complex for the audience we want to target with this dashboard. The background image should be :

• always fill view
• always center
• no repeat

For the from scratch dashboard??

[piitaya]

@timmo001 Yeah may be the manual on can be simplified and we can an advanced mode for all the parameter. For now, the background editor is too complicated with too many options to bring it to home panel.