feat: support removing watch status when null

A user can choose to remove a show from being in their media list completely, by setting the watch status to null

src/controllers/watch-status/index.ts

@@ -16,7 +16,7 @@ const app = new OpenAPIHono<Env>();
 
 const UpdateWatchStatusRequest = z.object({
   deviceId: z.string(),
-  watchStatus: WatchStatus,
+  watchStatus: WatchStatus.nullable(),
   titleId: AniListIdSchema,
   isRetrying: z.boolean().optional().default(false),
 });
@@ -60,8 +60,12 @@ const route = createRoute({
 });
 
 app.openapi(route, async (c) => {
-  const { deviceId, watchStatus, titleId, isRetrying } =
-    await c.req.json<typeof UpdateWatchStatusRequest._type>();
+  const {
+    deviceId,
+    watchStatus,
+    titleId,
+    isRetrying = false,
+  } = await c.req.json<typeof UpdateWatchStatusRequest._type>();
   const aniListToken = c.req.header("X-AniList-Token");
 
   if (!isRetrying) {