feat: Add error msg and unmask text and icons

[nw-sentry]

Summary

• Show error message on the checkout screen when placing an order fails
• Wrap non-PII text and icons with Sentry.Unmask so they remain visible in session replays
• Remove the static "Deliver to Sentry" text

Emulator

Session Replay

Test plan

• Trigger a failed checkout (e.g. bad backend URL / 500 response) and verify the "Unknown error placing order" message appears above the button and clears on the next attempt.
• Verify the Apply and Place your order buttons render full width on the checkout screen.
• Record a session replay and confirm product titles/prices, button labels, and bottom tab icons are not masked.