feat: Surface the provider's error cause in the media_unavailable notification (#2599)

- Closes: #2592

tests/components-lib/live/utils/dispatch-live-error.test.ts

@@ -3,22 +3,27 @@ import { expect, it, vi } from 'vitest';
 import { dispatchLiveErrorEvent } from '../../../../src/components-lib/live/utils/dispatch-live-error';
 
 // @vitest-environment jsdom
-it('should dispatch live error event', () => {
+it('should dispatch live error event with an empty error when none is given', () => {
   const element = document.createElement('div');
   const handler = vi.fn();
   element.addEventListener('advanced-camera-card:live:error', handler);
 
   dispatchLiveErrorEvent(element);
-  expect(handler).toBeCalled();
+  expect(handler).toHaveBeenCalledWith(expect.objectContaining({ detail: {} }));
 });
 
-it('should forward the reason as the event detail', () => {
+it('should forward the reason and detail as the event detail', () => {
   const element = document.createElement('div');
   const handler = vi.fn();
   element.addEventListener('advanced-camera-card:live:error', handler);
 
-  dispatchLiveErrorEvent(element, 'unsupported');
+  dispatchLiveErrorEvent(element, {
+    reason: 'unsupported',
+    detail: 'Codec not supported',
+  });
   expect(handler).toHaveBeenCalledWith(
-    expect.objectContaining({ detail: 'unsupported' }),
+    expect.objectContaining({
+      detail: { reason: 'unsupported', detail: 'Codec not supported' },
+    }),
   );
 });