fixed 401: duplicate events in state hook

[romanstetsyk]

Description

This PR prevents adding duplicate events to the state if a recurring event spans more than 1 month.

Type of change

Please select everything applicable. Please, do not delete any lines.

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update
• [ ] This change requires an update to testing

Issue

• [x] Is this related to a specific issue? If so, please specify: #401

Checklist:

• [x] This PR is up to date with the main branch, and merge conflicts have been resolved
• [x] I have executed npm run test and all tests have passed successfully or I have included details within my PR on the failure.
• [x] I have executed npm run lint and resolved any outstanding errors. Most issues can be solved by executing npm run format
• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [x] My changes generate no new warnings

[Caleb-Cohen]

LGTM, should we add testing to accompany this?

[Caleb-Cohen]

Howdy @romanstetsyk did you get a chance to review my question?

[romanstetsyk]

@Caleb-Cohen I'm sorry, I didn't see your last message. It's a good idea, but I still need to figure out how to write tests in Cypress. It would be great if someone could add tests to this pr or create a separate issue

[Caleb-Cohen]

@Caleb-Cohen I'm sorry, I didn't see your last message. It's a good idea, but I still need to figure out how to write tests in Cypress. It would be great if someone could add tests to this pr or create a separate issue

I'll take it up!