fix: PyQt6 migration completion and crash fixes across frontend and NGHDL#521

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VaradhaCodes:fix/pyqt6-migration-and-bugfixes

Commits on Jun 2, 2026

PyQt6 migration and bug fixes across frontend, kicad, nghdl, and related modules
VaradhaCodes
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fix(devicemodel): guard all eSim_general_libs branches against short netlist lines
VaradhaCodes
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