feat: Add support for Frigate reviews / detections [initial PR] (#2315)

- Add support for Frigate reviews / detections.
 - Add support for GenAI metadata.
- Significant internal refactor to more flexible "UnifiedQuery" to allow
mixing cameras with simple metadata and review metadata (e.g. a timeline
view of a Frigate camera with reviews, and a Reolink camera with simple
metadata).
 - Add support for folder media as camera media.

There are a few more PRs to commit prior to this going live, but
commiting this for now due to the scale of the change.

BREAKING CHANGE: `media_type` and `events_type` are retired under
`live`, `viewer` and `timeline` configuration sections, instead media
type is associated (once) with the camera under `media`.

tests/utils/overlay-message.test.ts

@@ -0,0 +1,31 @@
+import { describe, expect, it, vi } from 'vitest';
+import {
+  dispatchDismissOverlayMessageEvent,
+  dispatchShowOverlayMessageEvent,
+} from '../../src/utils/overlay-message';
+
+// @vitest-environment jsdom
+describe('overlay-message utils', () => {
+  it('should dispatch show overlay message event', () => {
+    const element = document.createElement('div');
+    const message = { text: 'test' };
+    const handler = vi.fn();
+    element.addEventListener('advanced-camera-card:overlay-message:show', handler);
+
+    dispatchShowOverlayMessageEvent(element, message);
+
+    expect(handler).toHaveBeenCalled();
+    const event = handler.mock.calls[0][0];
+    expect(event.detail).toBe(message);
+  });
+
+  it('should dispatch dismiss overlay message event', () => {
+    const element = document.createElement('div');
+    const handler = vi.fn();
+    element.addEventListener('advanced-camera-card:overlay-message:dismiss', handler);
+
+    dispatchDismissOverlayMessageEvent(element);
+
+    expect(handler).toHaveBeenCalled();
+  });
+});