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Consume the server-driven banner block (PR1) in the UI and retire the gate. - banner.ts: createScheduler — a smooth weighted round-robin over campaigns (each appears its weight share per cycle, evenly interleaved) with round-robin over a campaign's messages; the rotator drives fade-in -> hold/scroll -> fade-out -> gap -> fade-in, a lone message stays put, reduce-motion swaps instantly without scroll. - model.ts/codec.ts: Profile.banner (Banner/BannerCampaign/BannerTimings) decoded from the fbs block. - Screen.svelte: drop the compile-time SHOW_AD_BANNER; render AdBanner from app.profile.banner (campaigns + timings + reduceMotion). - AdBanner.svelte: opacity-driven fades + scroll host; the rotator is recreated when the campaigns/timings change (a `banner` notify re-fetch swaps them in place). - app.svelte.ts: on the `notify` `banner` sub-kind, refreshProfile() so the banner shows/hides in place. - tests: scheduler distribution + round-robin, the fade sequence, single-message, reduce-motion, stop(); codec banner decode. UI_DESIGN.md + trackers updated.