seat: add framework to select toplevels

toml-spec/spec/spec.generated.json

@@ -1166,6 +1166,10 @@
           "description": "The text color of unfocused titles.",
           "$ref": "#/$defs/Color"
         },
+        "highlight-color": {
+          "description": "Color used to highlight parts of the UI.",
+          "$ref": "#/$defs/Color"
+        },
         "border-width": {
           "type": "integer",
           "description": "The width of borders between windows.",

toml-spec/spec/spec.generated.md

@@ -2472,6 +2472,12 @@ The table has the following fields:
 
   The value of this field should be a [Color](#types-Color).
 
+- `highlight-color` (optional):
+
+  Color used to highlight parts of the UI.
+
+  The value of this field should be a [Color](#types-Color).
+
 - `border-width` (optional):
 
   The width of borders between windows.

toml-spec/spec/spec.yaml

@@ -1602,6 +1602,10 @@ Theme:
       ref: Color
       required: false
       description: The text color of unfocused titles.
+    highlight-color:
+      ref: Color
+      required: false
+      description: Color used to highlight parts of the UI.
     border-width:
       kind: number
       integer_only: true