[nmrtist]

Summary

Wheel scaling moved stacked NMR baselines instead of changing peak height, making DOSY attenuation harder to compare.

• Apply one display multiplier to numeric 1D traces, preserving baselines, spacing and relative attenuation for positive and negative peaks.
• Keep X-axis wheel zoom and 2D coordinate zoom.
• Show the multiplier and add View → Reset Peak Height, with undo, redo and project persistence.
• Keep cursors, peak markers, threshold lines and trace labels aligned while leaving scientific data unchanged.
• Update the English and Simplified Chinese guides.

Validation

• cargo pr-check: passed.
• Regression tests cover signed peak scaling, fixed baselines, navigation, undo/redo, reset and both project save modes.
• npm run build in docs/: passed.

UI display logic

• Reset Peak Height uses the command catalog and is searchable in the command palette.
• Unavailable reset actions remain visible with an actionable disabled reason.
• No layout changes from background events; panels are never auto-closed.
• User-visible behavior is documented in English and Simplified Chinese.