refactor MutationObserver state initialization to resolve potential identifier conflicts

[haneetsingh]

Description

Fix: initialize MutationObserver state in useEditable to resolve potential identifier conflicts

Fixes #34

Type of Change

• [x] Bug fix (non-breaking change which fixes an issue)

Checklist: (Feel free to delete this section upon completion)

• [ ] I have included a changeset if this change will require a version change to one of the packages.
• [x] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] I have run all builds, tests, and linting and all checks pass
• [ ] I have added tests that prove my fix is effective or that my feature works
• [x] My changes generate no new warnings
• [ ] Any dependent changes have been merged and published in downstream modules