feat: hide running Cocoa receiver from the Dock

src/mpd_now_playable/receivers/cocoa/now_playing.py

@@ -1,6 +1,7 @@
 from collections.abc import Callable, Coroutine
 from typing import Literal
 
+from AppKit import NSApplication, NSApplicationActivationPolicyAccessory
 from MediaPlayer import (
 	MPChangePlaybackPositionCommandEvent,
 	MPMusicPlaybackStatePlaying,
@@ -42,6 +43,9 @@ class CocoaNowPlayingReceiver(Receiver):
 		pass
 
 	async def start(self, player: Player) -> None:
+		NSApplication.sharedApplication().setActivationPolicy_(
+			NSApplicationActivationPolicyAccessory
+		)
 		self.cmd_center = MPRemoteCommandCenter.sharedCommandCenter()
 		self.info_center = MPNowPlayingInfoCenter.defaultCenter()
 

stubs/AppKit/__init__.pyi

@@ -2,6 +2,16 @@ from typing import Final, Literal
 
 from Foundation import CGSize
 
+NSApplicationActivationPolicyRegular: Final = 0
+NSApplicationActivationPolicyAccessory: Final = 1
+NSApplicationActivationPolicyProhibited: Final = 2
+NSApplicationActivationPolicy = Literal[0, 1, 2]
+
+class NSApplication:
+	@staticmethod
+	def sharedApplication() -> NSApplication: ...
+	def setActivationPolicy_(self, policy: NSApplicationActivationPolicy) -> bool: ...
+
 # There are many other operations available but we only actually use copy, so we don't need all of them here.
 NSCompositingOperationClear: Final = 0
 NSCompositingOperationCopy: Final = 1