fix: use SOCK_DGRAM for ydotoold socket (v1.0.4+)

ydotoold v1.0.4+ uses SOCK_DGRAM (unixgram) Unix sockets instead of
SOCK_STREAM. The availability check was using net.DialTimeout("unix", ...)
which only supports stream sockets, causing a "protocol wrong type for
socket" error on systems with newer ydotool versions.

Try unixgram first, then fall back to stream for older versions.

internal/injection/ydotool.go

@@ -32,7 +32,12 @@ func (y *ydotoolBackend) Available() error {
 			return fmt.Errorf("ydotoold socket not found - ensure ydotoold is running")
 		}
 
-		conn, err := net.DialTimeout("unix", socketPath, 500*time.Millisecond)
+		// ydotoold v1.0.4+ uses SOCK_DGRAM (unixgram) sockets.
+		// Try unixgram first, then fall back to stream for older versions.
+		conn, err := net.Dial("unixgram", socketPath)
+		if err != nil {
+			conn, err = net.DialTimeout("unix", socketPath, 500*time.Millisecond)
+		}
 		if err != nil {
 			return fmt.Errorf("ydotoold not responding at %s: %w", socketPath, err)
 		}