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/lpr.ts

@@ -3,6 +3,28 @@ import type { SectionConfigOverrides } from "./types";
 const lpr: SectionConfigOverrides = {
   base: {
     sectionDocs: "/configuration/license_plate_recognition",
+    messages: [
+      {
+        key: "global-disabled",
+        messageKey: "configMessages.lpr.globalDisabled",
+        severity: "warning",
+        condition: (ctx) => {
+          if (ctx.level !== "camera") return false;
+          return ctx.fullConfig.lpr?.enabled === false;
+        },
+      },
+      {
+        key: "vehicle-not-tracked",
+        messageKey: "configMessages.lpr.vehicleNotTracked",
+        severity: "info",
+        condition: (ctx) => {
+          if (ctx.level !== "camera" || !ctx.fullCameraConfig) return false;
+          if (ctx.fullCameraConfig.type === "lpr") return false;
+          const tracked = ctx.fullCameraConfig.objects?.track ?? [];
+          return !tracked.some((o) => ["car", "motorcycle"].includes(o));
+        },
+      },
+    ],
     fieldDocs: {
       enhancement: "/configuration/license_plate_recognition#enhancement",
     },