feat: add Chromecast playback support

Checks/network-playback.mm

@@ -813,6 +813,18 @@ static void reporting(const std::string &base, const std::string &fixtures) {
             std::abs([rows[0][@"position_seconds"] doubleValue] - 50) < .03 &&
             [rows[0][@"completion_eligible"] boolValue],
             "initial report is restored native position, not pre-resume zero");
+    PlayerState receiver = player_get_state(player.get());
+    receiver.position = 114;
+    receiver.status = PLAYER_PAUSED;
+    require(player_report_remote_state(player.get(), &receiver), "receiver-confirmed progress accepted");
+    require(player_close(player.get()), "close immediately after receiver progress");
+    until(player.get(), [&](auto state) {
+        auto current = progressRecords(path);
+        return state.status == PLAYER_EMPTY && [current.lastObject[@"event"] isEqualToString:@"closed"] &&
+            [current.lastObject[@"position_seconds"] doubleValue] == 114;
+    }, "closing drains final Cast position instead of abandoned decoder position");
+    require([progressRecords(path).lastObject[@"completion_eligible"] boolValue],
+            "receiver-confirmed video remains completion eligible");
     require(openNetwork(player.get(), base, "/failure/av.mp4", "", 4, false, true, second),
             "failed requested identity accepted asynchronously");
     until(player.get(), [](auto state) { return state.status == PLAYER_ERROR; }, "failed reported open", true);