Safety fixes, random voice generator, resizable UI, 4-op sysex import#517

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wellsst wants to merge 9 commits intoasb2m10:masterfrom

wellsst:fix/phase1-safety-critical

Commits on Mar 14, 2026

Fix safety-critical bugs: crashes, UB, and data corruption

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Add random voice generator (RND button)

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Add resizable window with aspect ratio constraint

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Fix CI/build issues, add include guards, fix EngineMkI gain interpolation

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Add 4-operator sysex import (DX21/DX27/DX100/TX81Z)

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Thread safety fixes and drag-and-drop .syx support

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Fix window shrinking on move after resize

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Add RND history with PREV button, convert dialogs to async

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Add keyboard shortcuts, fix null safety across UI components

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