Always ping if prefix is empty & fix quick prefix functionality

[vilhu-github]

Leaving the ping prefix empty in the config may result in odd behaviour. This checks if the string is empty, and always pings if matched.

Also fixes quick prefix for channels, not sure if that's an ideal way to do it but it works,

[Copilot]

Pull request overview

This PR adjusts chat ping matching when the configured ping prefix is empty, and changes Paper chat handling to preserve/propagate the selected channel when quick-prefix channel selection is involved.

Changes:

• Update ping regex generation so an empty ping prefix matches bare username/display-name mentions.
• Track the resolved chat channel during Paper’s decorate phase and reuse it during the actual chat event to improve quick-prefix channel behavior.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
paper/src/main/java/net/draycia/carbon/paper/listeners/PaperChatListener.java	Stores a per-player channel key during decorate and uses it to select the channel during AsyncChatEvent handling.
common/src/main/java/net/draycia/carbon/common/listeners/PingHandler.java	Builds a different ping regex when prefix is empty to always ping on username/display-name mention.

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[vilhu-github]

Commit 25b2cc7 seems to fix desync issues, apparently caused by blocking retrieval of data leading to the player getting disconnected:

[ERROR]: Failed to validate message acknowledgements from player: Checksum mismatch on last seen update: the client and server must have desynced

After this, I haven't encountered this issue again. See Copilot's notes for more information.

EDIT:
My fix attempts can be found here: https://github.com/vilhu-github/Carbon/tree/develop. I was unable to fix the issue entirely, though the amount of errors did decrease. Anyone more skilled is free to use my code if it helps to find a fix.

[vilhu-github]

No changes after modifications based on Copilot's feedback. The errors with checksum mismatches are deeper than I originally expected. This only addresses the ping feature and quick prefix.