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
