Monomers with hyphens in names are loaded incorrectly

[MarinaKisacik]

Found while testing #3541

Steps to Reproduce:

1. Open Macromolecules - Flex mode (clean canvas)
2. Paste the following BILN string from the clipboard: [D-2Thi]-[D-gGlu]-[Lys-al]
3. Click Open as New or Add to Canvas button

Actual Result:
System treats hyphens within the square brackets as monomer connections and loads 6 monomers with incorrect names instead of 3 monomers that contain hyphens in their names

Expected Result:
The system should correctly interpret monomer names containing hyphens and load three monomers with the names: D-2Thi, D-gGlu, and Lys-al

Found in Environment:

• Ketcher Version 3.17.0-rc.1 Build at 2026-06-02; 21:27:10
• Indigo Version 1.45.0-rc.2.0-g168fb85f2-wasm32-wasm-clang-23.0.0
• Chrome Version 149.0.7827.156 (Official Build) (64-bit)
• Win11