Fix: prevent arrow key nav conflict inside textareas

[Hellkryptonium]

What does this change?

This PR fixes a bug where pressing the left or right arrow keys inside a textarea would trigger navigation to a different prep section instead of moving the cursor within the textarea.

The fix ensures that arrow key navigation handlers ignore key events when the focused element is an input or textarea.

Common Content?

• [] Block/s

Common Theme?

• [x] Yes

Issue number: #1072

Org Content?

A function fixed

Module | Sprint | Page Type | Block Type

Checklist

• [x] I have read the contributing guidelines
• [x] I have checked my spelling and grammar with an automated tool
• [x] I have previewed my changes to check the markdown renders as I intend
• [x] I have run my code to check it works
• [x] My changes follow our Style Guide

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