Open the app with the Predator key, bump to 1.3.0

The Predator key sends keyboard usage 0xC9, which lies outside the
logical range the keyboard declares, so the kernel never emits an input
event for it. It is also reported on vendor report 4 of USB interface 2
(04 81 ff on press). predatord now listens there and opens the app in
the active graphical session via the user's systemd manager.

The action is configurable on the System page: open the app, switch to
the next performance mode, or do nothing.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

predator_control/keyboard.py

@@ -13,6 +13,7 @@ import threading
 ACER_VID = 0x04F2
 KNOWN_PIDS = (0x0117, 0x011A)
 LED_INTERFACE = 3
+HOTKEY_INTERFACE = 2   # vendor report 4 carries the Predator key
 NUM_CELLS = 128
 
 OP_BEGIN = 0x88
@@ -57,7 +58,7 @@ def checksum(body7):
     return (0xFF - (sum(body7) & 0xFF)) & 0xFF
 
 
-def find_hidraw():
+def find_hidraw(interface=LED_INTERFACE):
     """Path of the hidraw node of the LED interface, or None."""
     for node in sorted(glob.glob("/sys/class/hidraw/hidraw*")):
         try:
@@ -76,7 +77,7 @@ def find_hidraw():
         devpath = os.path.realpath(os.path.join(node, "device"))
         # .../1-7:1.3/0003:04F2:011A.0004  -> interface number from the parent
         iface = os.path.basename(os.path.dirname(devpath)).rsplit(".", 1)[-1]
-        if iface == str(LED_INTERFACE):
+        if iface == str(interface):
             return "/dev/" + os.path.basename(node)
     return None