Add icons for the new views in the Energy Dashboard

[itsmariodias]

What type of request is this?

Enhancement to existing card/feature

Existing card or feature name

{"Dashboard" => "Energy"}

Describe the enhancement

With 2025.12, the Energy dashboard can now have multiple views like Summary, Energy, Water, Now, etc.
These views in the tab navbar do not have associated icons, like other views normally do.
It would be good to associate an icon with each of these new views, since we cannot customize these views.

Use cases

Makes the views consistent with the other dashboards in Home Assistant, especially in the companion app.

Visual examples

No response

Anything else?

No response