kiss

• Optimized heart particle spawn position to ensure it appears in first-person view without blocking sight.
• Improved heart particle triggering logic to only activate when other players are within visible line of sight.
• Refactored code structure and enhanced overall performance.

Added Config Options

• maxViewAngleDegree
  Controls the maximum view angle (in degrees) used to determine if another player is within your line of sight.
  Default: 45.0

• selfKissErrorMessage
  Customizable message shown when a player tries to kiss themselves.
  Default: "You can't kiss yourself!"

• cooldownErrorMessage
  Customizable message shown when trying to kiss during cooldown.
  Supports %d for remaining seconds.
  Default: "You must wait %d seconds before kissing again!"