MC Presence v2.0.4

Fixes

• Avatars now use the correct MC username — connectedUsername was set server-side but never included in serializeBot, so the frontend always fell back to bot.label when rendering avatars via mc-heads.net. If a bot's label differed from its MC username, the default Steve skin was shown. The field is now exported.
• Bridge-bot chat mirrors to all session logs — CobbleBot and other CobbleBridge-type bots broadcast via the plugin, but mineflayer sessions either don't receive those events or filter them as system messages (since the virtual player isn't in the tab list). Bridge-bot public messages are now mirrored directly into every other connected session's chat log as regular chat lines. Includes manual sends via the Chat input and AI-generated responses. Whispers are not mirrored. A de-dup guard in mineflayer's bot.on("chat") skips any line whose sender matches a known bridge-bot label.