fix: improve compact screen layouts across onboarding screens

[transphorm]

Summary

• scale the Launch screen hero illustration, typography, and CTA spacing based on screen dimensions
• make Coming Soon and document picker headers responsive to compact device widths
• wrap the recovery phrase entry in a keyboard-aware layout with a flexible textarea height

Testing

• not run (not requested)

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https://chatgpt.com/codex/tasks/task_b_68eebf896864832d9480ccc839ea9595

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch codex/plan-for-dynamic-component-resizing

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[transphorm]

closing in favor of

#1285