Prevent process reference crash during explicit hydrogen toggle in monomer wizard

[Copilot]

How the feature works? / How did you fix the issue?

Explicit hydrogens toggle inside the monomer creation wizard could throw process is not defined, interrupting removal of leaving groups while keeping hydrogen atoms. The crash stemmed from a standalone worker path referencing process in browser context.

• Runtime guard for standalone Indigo callback
  • Ensure process is checked before accessing process.env to avoid browser-side ReferenceError.

const isSeparateRender =
  typeof process !== 'undefined' && process.env?.SEPARATE_INDIGO_RENDER;

Check list

• unit-tests written
• e2e-tests written
• documentation updated
• PR name follows the pattern #1234 – issue name
• branch name doesn't contain '#'
• PR is linked with the issue
• base branch (master or release/xx) is correct
• task status changed to "Code review"
• reviewers are notified about the pull request

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add/Remove explicit hydrogens operation inside create monomer wizard causes exception: process is not defined</issue_title>
<issue_description>Steps to Reproduce

1. Open Molecules canvas
2. Paste followng molecule on the canvas: CCCP%91(N)(O)C.[*:1]%91 |$;;;;;;;_R1$|

3. Select whole molecule and press Create a monomer button

3. Press Add/Remove explicit hydrogens button twice

Actual behavior
System throws exception: process is not defined

Expected behavior
No exception, R1 leaving group removed but H atom remains

Comment from the developer: need to try using atoms mapping before sending to indigo

Environment details:

• Ketcher Version 3.11.0-rc.1 2025-11-27; 18:06:40
• Indigo Version 1.39.0-rc.1.0-gddb882b27-wasm32-wasm-clang-19.0.0
• Chrome Version 142.0.7444.176 (Official Build) (64-bit)
• Win10</issue_description>

Comments on the Issue (you are @copilot in this section)

@rrodionov91 need to try using atoms mapping before sending to indigo

• Fixes Add/Remove explicit hydrogens operation inside create monomer wizard causes exception: process is not defined #8818

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