Discover: the boosted strip on the phone screen

[xuelink]

Summary

• Adds the boosted strip to DiscoverScreen.svelte — the bolt heading, "What is this?", and four cards. The app has shown paying members above the discovery list since Boosted profiles, the Boost switch, account suspension, status tags and three-letter usernames langx#1274; this phone screen had not caught up.
• Fixes the search icon. Its lens was centred at 11,18 with a radius of 7, so the circle ran a pixel past the 24 viewBox and clipped flat — stroked, it read as a filled blob rather than a magnifier. Centred at 11,11.
• Re-cuts static/email/screen-discover.png from the updated screen (same 1170×2000 window at 520×889).

Why this component and not just the pictures

Every picture of Discover we ship is cut from this component — the store screenshots in all eight languages, the press screens, the postcard, the launch email. There is no other source. So the strip had to land here before any of that could be re-rendered, and langx/branding has a companion PR that re-shoots all of it.

Notes for the reviewer

• The four faces in the strip — María, Daniel, Kenji, Sofia — are the ones the list below does not use, so no face appears twice on one screen.
• The app hides the strip entirely when nobody qualifies. This replica always shows it: it is what the stores photograph, and an empty strip is the one state that must not be in the picture. The comment in the file says so.
• POLYGLOT / FLUENT are brand marks, not translated strings — same as TIER_BADGES in the app and the me screen here.
• Tokens only: --color--pro, --color--accent-tint, --color--muted. Nothing new added to the palette, and the strip themes with everything else.
• prettier --check and eslint both clean on the two changed files.

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