feat(combo-box): support warning state

docs/src/COMPONENT_API.json

@@ -1258,6 +1258,26 @@
           "constant": false,
           "reactive": false
         },
+        {
+          "name": "warn",
+          "kind": "let",
+          "description": "Set to `true` to indicate an warning state",
+          "type": "boolean",
+          "value": "false",
+          "isFunction": false,
+          "constant": false,
+          "reactive": false
+        },
+        {
+          "name": "warnText",
+          "kind": "let",
+          "description": "Specify the warning state text",
+          "type": "string",
+          "value": "\"\"",
+          "isFunction": false,
+          "constant": false,
+          "reactive": false
+        },
         {
           "name": "light",
           "kind": "let",

docs/src/pages/components/ComboBox.svx

@@ -59,6 +59,15 @@ items={[
   {id: "2", text: "Fax"}
   ]}  />
 
+### Warning state
+
+<ComboBox warn warnText="This contact method is not associated with your account" titleText="Contact" placeholder="Select contact method"
+items={[
+  {id: "0", text: "Slack"},
+  {id: "1", text: "Email"},
+  {id: "2", text: "Fax"}
+  ]}  />
+
 ### Disabled
 
 <ComboBox disabled titleText="Contact" placeholder="Select contact method"