refactor(mention): move from bot.py to event cog

cogs/events/mention.py

@@ -0,0 +1,41 @@
+import discord
+import random
+from discord.ext import commands
+
+
+class MentionListener(commands.Cog):
+    def __init__(self, bot) -> None:
+        self.bot = bot
+
+    @commands.Cog.listener()
+    async def on_message(self, message: discord.Message) -> None:
+        if message.author == self.bot.user or message.author.bot:
+            return
+
+        if self.bot.user in message.mentions:
+            try:
+                emoji_options = [
+                    "<a:PandaPing:1417550314260926575>",
+                    "<:PandaPing2:1434998389451395224>",
+                    "<:PandaPing3:1434998524696723466>",
+                ]
+                selected_emoji = random.choice(emoji_options)
+                self.bot.logger.debug(
+                    f"Attempting to react with emoji: {selected_emoji}"
+                )
+                await message.add_reaction(selected_emoji)
+                self.bot.logger.debug("Successfully reacted with mention emoji")
+            except Exception as e:
+                self.bot.logger.debug(f"Failed to react with mention emoji: {e}")
+                try:
+                    self.bot.logger.debug("Falling back to wave emoji")
+                    await message.add_reaction("👋")
+                    self.bot.logger.debug("Successfully reacted with wave emoji")
+                except Exception as fallback_error:
+                    self.bot.logger.debug(
+                        f"Failed to react with fallback emoji: {fallback_error}"
+                    )
+
+        await self.bot.process_commands(message)
+
+