fix(core): resolve cast button ssr hydration mismatch

Author: spuppo-mux

packages/core/src/core/ui/cast-button/cast-button-core.ts

@@ -27,7 +27,7 @@ export class CastButtonCore {
 
   readonly state = createState<CastButtonState>({
     castState: 'disconnected',
-    availability: 'unavailable',
+    availability: 'unsupported',
     label: '',
   });
 

packages/core/src/dom/store/features/remote-playback.ts

@@ -10,7 +10,7 @@ export const remotePlaybackFeature = definePlayerFeature({
   name: 'remotePlayback',
   state: ({ target }): MediaRemotePlaybackState => ({
     remotePlaybackState: 'disconnected',
-    remotePlaybackAvailability: 'unavailable',
+    remotePlaybackAvailability: 'unsupported',
 
     async toggleRemotePlayback() {
       const { media, container } = target();