Upgrade IRremote library to 4.4.1 for ESP32 compatibility

IRremote 4.1.2 is incompatible with ESP32 Arduino core 3.x due to
deprecated timer API functions. Version 4.4.1 includes fixes for
ESP32 core 3.x compatibility.

Changes:
- Update CI workflow to install [email protected]
- Update version comments in both sketches
- Tested locally on all three platforms (Uno, ESP8266, ESP32)
- All builds pass successfully

Fixes ESP32 compilation errors:
- timerAlarmEnable/timerAlarmDisable not declared
- timerBegin/timerAttachInterrupt signature changes
- ledcSetup/ledcAttachPin not declared

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: pidge

.github/workflows/arduino-build.yml

@@ -46,7 +46,7 @@ jobs:
 
     - name: Install IRremote library
       run: |
-        arduino-cli lib install "IRremote@4.1.2"
+        arduino-cli lib install "IRremote@4.4.1"
 
     - name: Compile sketch for ${{ matrix.board.name }}
       run: |

ac_control/ir_receiver/ir_receiver.ino

@@ -1,6 +1,6 @@
 #define sprint Serial.print
 #define sprintln Serial.println
-#include <IRremote.hpp> // IRremote 4.1.2 from Library Manager
+#include <IRremote.hpp> // IRremote 4.4.1 from Library Manager
 
 int RECV_PIN = 11;
 unsigned long timeBegin;

ac_control/ir_sender/ir_sender.ino

@@ -1,4 +1,4 @@
-#include <IRremote.hpp> // IRremote 4.1.2 from Library Manager
+#include <IRremote.hpp> // IRremote 4.4.1 from Library Manager
 
 // PIR motion sensor configuration
 #define PIR_PIN 2  // GPIO pin connected to PIR sensor output