[Mobile][Starter buttons] Intro text is left aligned, should be centered

[VolhaBazhkova]

DIAL chat version

0.45.0

What happened?

1. On dev env open DIAL in mobile view
2. On the first conversation screen set ChatHub with GPT-5 - any version or Anthropic Claude
3. Note that intro text is left aligned -> bug

Expected: Intro text should be centered

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