Add global option for section background and box-shadow

[Mariusthvdb]

What type of request is this?

New dashboard feature

Existing card or feature name

{"View" => "Sections"}

Describe the enhancement

allow setting ha-section-background-color in a theme, and have 1 global setting to make that apply to all sections

Use cases

as it appears, we can now only apply that on sections that have an individual setting for background: true

my main goal would be to make the sections stand out against the background in a view, and have that themed, and all over in the dashboards.

requiring a setting per section is a terrible inconvenience, where setting a global
section-background: true (default false) would make the world of difference

Visual examples

No response

Anything else?

Yes, since you ask: having ha-section-background-color, means we can not use a gradient, or an image for that option. It would be truly magnificent if could also use ha-section-background to set those additional styling options, so I would hope you consider adding support for that too:

please add option for ha-section-background

also, experimenting with the backgrounds a bit, it reveals the 'need' to be able to use a box-shadow to the colored section.

using a box-shadow on a markdown card in the header of the view, the section below that without a box-shadow feels uncomfortably 'flat'. Would be great if we could simply add the same box-shadow to the section background to make them all flow into the same theme styling

please consider adding that too, I'll add to the title