fix: allow arrow up/down keys within focus trapped text area

[bpk9]

What changed?

1. Prevent focus trap from calling preventDefault() when up/down arrow keys are pressed within a textarea

Why?

• Users are unable to navigate textareas via the keyboard when used within focus traps (typically via a modal)

Root cause (required for bugfixes)

• Focus trap always calls preventDefault() when up/down arrow keys are pressed (see FocusTrap.tsx#L196-L203)

UI changes

Web Old	Web New
Before.mov	After.mov

Testing

How has it been tested?

• Unit tests
• Interaction tests
• Pseudo State tests
• Manual - Web
• Manual - Android (Emulator / Device)
• Manual - iOS (Emulator / Device)

Testing instructions

1. Run storybook locally and go to http://localhost:6006/?path=/story/components-focustrap--text-area
2. Verify up/down arrow keys allow you to move up/down through the textarea

Illustrations/Icons Checklist

Required if this PR changes files under packages/illustrations/** or packages/icons/**

• verified visreg changes with Terran (include link to visreg run/approval)
• all illustration/icons names have been reviewed by Dom and/or Terran

Change management

type=routine
risk=low
impact=sev5

automerge=false

[cb-heimdall]

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