Fix three code bugs

[SpoddyCoder]

Fix command injection, race condition, and unquoted variable bugs in Kubernetes helper scripts.

This PR addresses:

• A command injection vulnerability in find-pod-and by quoting grep search terms.
• A race condition in launch-dashboard by implementing a file-based lock for kubectl proxy startup.
• General unquoted variable issues in find-pod-and to improve reliability with special characters.

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