Add app icon and update build process

build_app.py

@@ -19,11 +19,16 @@ def build():
     system = platform.system()
     print(f"Detected OS: {system}")
 
+    # Determine separator for --add-data
+    sep = ";" if system == "Windows" else ":"
+    
+    # Base command
     base_cmd = [
         sys.executable, "-m", "PyInstaller",
         "--onefile",
         "--windowed",
         "--paths", "src",
+        f"--add-data=app_icon.png{sep}.",
         "src/main.py"
     ]
 
@@ -31,6 +36,8 @@ def build():
         name = "TeletextEditor_Linux"
     elif system == "Windows":
         name = "TeletextEditor_Windows.exe"
+        # Add icon for Windows executable
+        base_cmd.append("--icon=app_icon.ico")
     else:
         print(f"Unsupported platform: {system}")
         return
@@ -57,4 +64,4 @@ def build():
 
 if __name__ == "__main__":
     clean_build_dirs()
-    build()
+    build()