chore(main): release 2.1.0

[cheminfo-bot]

🤖 I have created a release beep boop

2.1.0 (2026-03-23)

Features

• add loadFileCollection imperative API (#4056) (4ae8ee3)
• allow to add assignment in 13C (cc55619)
• delete 1D signal on backspace key press (a19fc1f), closes #3991
• display form errors in footer (and count in header) (#4044) (b8f5674)
• implement axis unit picker behind experimental flag (#4054) (cf9f1ec)
• replace old settings form with the new implementation (#4058) (fe2f032)
• supports axis customizations (#4004) (fdff7d7)

Bug Fixes

• add support for <sub> tag in SVG publication string rendering (#4052) (165b088)
• form reset is properly applied to checkboxes (eb51408)
• margin for peaks label should not have max in general form (#4038) (3620893)
• unexpected scrollbar in new workspace dialog (#4046) (c2f6775)
• update contour level for 2D spectra once it is processed to FT (0949192)
• use absolute sum for 1D projections (#4068) (2c0adf3)
• use ref callback to access iframe document before portal render (1ade0fc)

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