## Description:
Replaced the original focus/visibility-based MultiTabDetector
implementation with a lock-based system using localStorage to reliably
prevent multitabbing in OpenFront. The new system enforces a single
active tab per browser instance by using a unique tabId and a shared
lock key with periodic heartbeats. This eliminates race conditions,
prevents event-hook tampering, and avoids fingerprinting while
maintaining compatibility with existing punishment callbacks and UI
warnings.
## Please complete the following:
- [X] I have added screenshots for all UI updates
- [X] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [X] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors
## Please put your Discord username so you can be contacted if a bug or
regression is found:
Lucas
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Co-authored-by: evan <openfrontio@gmail.com>
icslucas