Fix port-only net label placement solver and update snapshots #42
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Summary
Testing
bun test tests/solvers/NetLabelPlacementSolver/SingleNetLabelPlacementSolver/SingleNetLabelPlacementSolver01.test.tsBUN_UPDATE_SNAPSHOTS=1 bun test tests/examplesbun testhttps://chatgpt.com/codex/tasks/task_b_68ba8296c048832eb50a81c8cf4c146d