fix(UserPreferences): restore accessible text size in dialog settings

[dan-rukas]

Context

This PR improves accessibility and simplifies layout styles in the UserPreferencesModal settings, building on the i18n work in #5561.

Changes & Results

• Reduced column gap - gap-x-16 → gap-x-10
• Restored alignment so labels align vertically with their input fields - items-start → items-center
• Simplified label classes to just text-base. The additional flex and whitespace utilities were explicitly controlling text wrapping, but this happens naturally with default browser behavior. The adjusted column gap provides more space for longer translations.

Testing

Visually tested with multiple localizations to ensure labels display correctly with proper wrapping overflow.

Checklist

PR

• My Pull Request title is descriptive, accurate and follows the
  semantic-release format and guidelines.

Code

• My code has been well-documented (function documentation, inline comments,
  etc.)

Public Documentation Updates

• [] The documentation page has been updated as necessary for any public API
  additions or removals.

Tested Environment

• OS: mac)S Sequoia 15.7.3 (24G419), Apple M4 Pro
• Node version: 20.19.1
• Browser: 143.0.7499.193 (Official Build) (arm64)

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