clearInlineSlot method
Clears the inline slot at slotKey, if any. No-op if nothing is active
there.
Implementation
void clearInlineSlot(String slotKey) {
final removedConfig = _slotConfigs.remove(slotKey);
final removedPayload = _slotPayloads.remove(slotKey);
if (removedConfig == null && removedPayload == null) return;
notifyListeners();
}