Move built-in BigFred intro warnings above buttons

[keskad]

Summary

• On the "Built-in BigFred on this phone" intro screen, move the multi-instance warning and orange top-bar info boxes above the action buttons.
• Users now see both notices after the main explanatory text and before choosing to start or go back.

Test plan

• Open discovery and navigate to "Built-in BigFred on this phone"
• Confirm the warning and orange-bar info appear below the body text
• Confirm "I understand — start anyway" and "Back" buttons appear below both notices
• Verify scrolling still works on smaller screens

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