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One "security" strip, in the same top slot and style as the status banner (#124), for this device, in priority order: - "Verify this device" — cross-signing exists but this device isn't verified (can't unlock backed-up history, untrusted to others). First, because verifying with the recovery key also connects the backup. - "Connect this device to your key backup" — a backup exists, this device isn't using it. - "Set up key backup" — no backup at all (includes accounts without cross-signing; the setup flow does both). The button opens Settings → Devices (existing flows); "Not now" snoozes. Rules: nothing in a device's first 24 h; "Not now" snoozes that nudge 7 days; 3 dismissals stop it; never on a healthy device; waits until sync has settled (never under "Connecting…"); outage/maintenance/connection strips win. Per-device record in localStorage, wiped on logout. Mounted inside the Matrix client context and an error boundary (an early version outside the context crashed the app on load — caught before pushing). Also: the status strip wraps its text on phones instead of truncating it when there's no Details button (benefits #124's strips too). Design approved on #123 (real-client screenshots there). Tests: 4 unit (the #123 state table, loading, timing, stored record); e2e: nothing during the grace period, "Set up key backup" → Settings → Devices, "Not now" holds across a reload. Unit 1319, Playwright 29 passed. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA