[nmrtist]

Summary

Preview 3D NMR phase edits on the current plane before applying them to the entire spectrum.

• Share PH0, PH1 and ppm pivot edits between canvas gestures and numeric controls, with previews computed by the NMR processing engine.
• Preserve committed contour thresholds and companion layers; reject stale preview results and keep drafts separate from persisted data.
• Make canvas phasing a consistent toggle, support direct 2D axis selection, and retain drafts when leaving the mode.
• Update the English and Simplified Chinese guides.

Validation

• cargo pr-check — passed, including numerical preview comparisons, pivot invariance, draft isolation, stale results and interaction tests.
• npm run build in docs/ — passed, generating 123 pages.
• Screenshot harness — completed; reviewed the 3D phase preview in light and dark themes.
• git diff --cached --check — passed.

UI display logic

• New or changed actions go through the command catalog (CommandId + describe) and are searchable in the command palette.
• Hiding happens only at Ribbon-group level (dataset kind or width budget); transient states disable with a disabled_reason that says how to unblock.
• No layout changes from background events; panels are never auto-closed.
• New panels or empty regions show an empty state with a next step.
• Docs updated in docs/ (English and zh-CN) for user-visible behavior.