Support for PNG/SVG export of expanded monomers

[ljubica-milovic]

Background

Currently expanded monomers do not get exported in their atom and bond representation in Ketcher molecules mode.
Canvas:

PNG export:

Requirements

1. Expanded monomers should be able to be exported both to PNG and SVG in their atom and bond form.

2. Any flipping and rotating of the expanded monomers should be reflected in the exported images.

3. Non-expanded monomers should still be exported as their symbols.

[Zhirnoff]

Tested. The feature doesn't work as described in the requirements.

2025-04-04_13h58_28.mp4

Desktop:

• OS: Windows 11
• Browser Chrome
• Version 133.0.6943.127 (Official Build) (64-bit)

Ketcher version
[Version 3.3.0-rc.1]
Indigo version
[Version 1.31.0-rc.1]