Add UI config messages framework (#22692)

* add config messages to sections and fields

* add alert variants

* add messages to types

* add detect fps, review, and audio messages

* add a basic set of messages

* remove emptySelectionHintKey from switches widget

use the new messages framework and revert the changes made in #22664

web/src/components/config-form/section-configs/face_recognition.ts

@@ -3,6 +3,26 @@ import type { SectionConfigOverrides } from "./types";
 const faceRecognition: SectionConfigOverrides = {
   base: {
     sectionDocs: "/configuration/face_recognition",
+    messages: [
+      {
+        key: "global-disabled",
+        messageKey: "configMessages.faceRecognition.globalDisabled",
+        severity: "warning",
+        condition: (ctx) => {
+          if (ctx.level !== "camera") return false;
+          return ctx.fullConfig.face_recognition?.enabled === false;
+        },
+      },
+      {
+        key: "person-not-tracked",
+        messageKey: "configMessages.faceRecognition.personNotTracked",
+        severity: "info",
+        condition: (ctx) => {
+          if (ctx.level !== "camera" || !ctx.fullCameraConfig) return false;
+          return !ctx.fullCameraConfig.objects?.track?.includes("person");
+        },
+      },
+    ],
     restartRequired: [],
     fieldOrder: ["enabled", "min_area"],
     hiddenFields: [],