iOS 17 Preview Code refactor & non-optional errors fix

[ZelynaFarrell]

Description

Updated preview code to be more in line with iOS and Xcode updates. Additionally, I removed the non-optional errors in LineChartView.

Types of changes

• 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 change)
• Non-functional change (Updating Documentation, CI automation, etc..)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.