Add numeric device ID option

Allow setting ESPNow device id from CLI and persist to settings.

Made-with: Cursor

cli.py

@@ -243,6 +243,14 @@ Examples:
         help="Device name"
     )
 
+    parser.add_argument(
+        "--id",
+        dest="device_id",
+        type=int,
+        metavar="0-255",
+        help="Numeric device ID used for ESPNow (0-255)"
+    )
+
     parser.add_argument(
         "--pin",
         type=int,
@@ -499,6 +507,10 @@ Examples:
     if args.default is not None:
         edits["default"] = args.default
 
+    if args.device_id is not None:
+        # Clamp into single-byte range; store as int in settings.json
+        edits["id"] = max(0, min(255, args.device_id))
+
     # 1. Download: get current settings from device
     try:
         print(f"Downloading settings from {args.port}...", file=sys.stderr)