Add unit tests for Log Streaming and Port-Forwarding state management

[bhf]

Log streaming and port-forwarding state management in src/lib/k8s.ts are complex and prone to edge-case bugs.

Goal

Implement unit tests specifically for startPortForward, stopPortForward, getPodLogStream, and listPortForwards.

Challenges

• These functions use net.Server and Writable/stream objects which are harder to mock.
• Need to verify that connections and sockets are properly closed when stopping a port-forward.

Acceptance Criteria

• Add tests for port-forwarding state in k8s.test.ts.
• Add tests for log streaming callbacks.
• Verify that the PortForward client is called with correct arguments.
• Ensure that existing port-forwards are tracked across calls.