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window.h3dSetFretSpacing was the only 3D-highway setting that applied via location.reload(). The SPA boots with #home as the active screen and has no restore-last-screen mechanism, so the reload ejected the user from Settings onto the home screen. Apply it live like every other 3D-highway setting: rebind the module-scope _h3dFretUniform flag (so panels mounted later this session pick up the new mode), recompute the two fretX-derived scalars baked at init (_fretLabelScaleRefW, FRET_WIDTH_MID), and broadcast a 'fretSpacing' change over the existing _bgEmitChange pub-sub so every mounted panel rebuilds its board via buildBoard(). Per-frame note geometry already reads fretX live. Settings copy updated (no longer reloads) and tests/js pin the no-reload / live-rebuild behavior. Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>