FIX: Item edit modal footer can overflow, preventing access to nav buttons

Acceptance Criteria

• Modal footer should be sticky and scroll with parent div if necessary
• Modal size should be tweaked to look better on various display sizes

Definition of Ready

• Understood by the team
• Has clear business value
• Is estimated
• Has its dependencies linked
• Is small
• Has its acceptance criteria defined

Definition of Done

• Built and runs without errors
• Is tested against acceptance criteria
• Demoed to the team
• Documented and commented code
• Pages have some basic styling (if appropriate)
• Has at least 70% code coverage for automated testing
• Uses Selenium to full stack test (if appropriate)
• Has no ESLint errors