#9489 - Nucleotide presets: Creating preset with the same component codes replaces properties of the existing preset (#9553)

* Enhance preset creation to ensure unique entries for identical component codes

* Fix validation logic in LabelEdit form to ensure label is defined

* Refactor: Update monomer comparison logic to include Name property and remove hidden property check

* Fixes

* Address monomer equality review feedback

Agent-Logs-Url: https://github.com/epam/ketcher/sessions/58f0310c-133b-4ffe-9344-b8698eb8a878

* Enhance monomer comparison to include 'hidden' property

Add comparison for 'hidden' property in monomer check.

---------

Co-authored-by: Alexey Girin <alexey_girin@epam.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

Author: 3 people

packages/ketcher-core/src/application/editor/Editor.ts

@@ -480,14 +480,8 @@ export class CoreEditor {
         }
       }
 
-      const existingMonomerIndex = this._monomersLibrary.findIndex(
-        (monomer) => {
-          return (
-            monomer?.props?.MonomerName === newMonomer?.props?.MonomerName &&
-            monomer?.props?.MonomerClass === newMonomer?.props?.MonomerClass &&
-            monomer?.props.hidden === newMonomer.props?.hidden
-          );
-        },
+      const existingMonomerIndex = this._monomersLibrary.findIndex((monomer) =>
+        areSameMonomers(monomer, newMonomer),
       );
 
       const newMonomerTemplateRef =