fix: make modal more CSP-friendly

[bendemboski]

Description

Setting up mouseover and mouseout event listeners using the onmouseover and onmouseout attributes prevents turning off unsafe-inline in the page's content security policy. This commit changes the event listeners to use addEventListener instead.

Type of Change

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

Checklist

• My code follows the style guidelines of this project ( Run yarn lint to check)
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (if applicable)
• My changes generate no new warnings or errors
• I have added tests that prove my fix is effective or that my feature works (if applicable)
• New and existing unit tests pass locally with my changes

How should be tested? (Manual or Automated Tests)

• Manual tests: I have tested this changes manually.