picture cards: add person image support (#32733)

Co-authored-by: c0ffeeca7 <38767475+c0ffeeca7@users.noreply.github.com>

source/_dashboards/picture-elements.markdown

@@ -36,6 +36,10 @@ image:
   required: true
   description: The URL of an image.<br/>To use a locally hosted image, see [Hosting](/integrations/http#hosting-files).
   type: string
+image_entity:
+  required: false
+  description: Image or person entity to display.
+  type: string
 camera_image:
   required: false
   description: A camera entity.

source/_dashboards/picture-entity.markdown

@@ -32,7 +32,7 @@ type:
   type: string
 entity:
   required: true
-  description: "An `entity_id` used for the picture."
+  description: "A camera, image, or person `entity_id` used for the picture."
   type: string
 camera_image:
   required: false

source/_dashboards/picture-glance.markdown

@@ -42,6 +42,10 @@ image:
   required: false
   description: Background image URL.
   type: string
+image_entity:
+  required: false
+  description: Image or person entity to display.
+  type: string
 camera_image:
   required: false
   description: Camera entity as Background image.

source/_dashboards/picture.markdown

@@ -34,6 +34,10 @@ image:
   required: true
   description: "The URL of an image. When you want to store images in your Home Assistant installation use the [hosting files documentation](/integrations/http/#hosting-files). After storing your files, use the `/local` path, for example, `/local/filename.jpg`."
   type: string
+image_entity:
+  required: false
+  description: Image or person entity to display.
+  type: string
 alt_text:
   required: false
   description: Alternative text for the image. This is necessary for users of assistive technology. The [W3C images tutorial](https://www.w3.org/WAI/tutorials/images/) provides simple guidance for writing alternative text.