Refactor DALI command handling: streamline send methods and enhance scene color reporting

Co-authored-by: Copilot <copilot@github.com>

src/dali_comm.cpp

@@ -201,6 +201,7 @@ bool DaliComm::sendCmd(uint8_t addr, uint8_t cmd) const {
   return writeFrame(frame);
 }
 
+// Send extended command frame (0x11). Gateway will send twice for 0x11, but we only need to send once.
 bool DaliComm::sendExtCmd(uint8_t addr, uint8_t cmd) const {
   const std::vector<uint8_t> frame{0x11, addr, cmd};
   const bool ret = writeFrame(frame);