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Step 1 of moving the desktop app's login out of the webview's plaintext localStorage: keep a verified copy of the tokens in the OS keychain (Windows Credential Manager, via cinny-desktop's new secure_session_* commands). The session is still read from localStorage exactly as before, so nothing about login changes and a keychain problem can't log anyone out. Step 2 (a later release, once this has run on real installs) switches reads to the keychain and drops the tokens from localStorage. - sessions.ts: onSessionPersisted — listeners told about every session write (login, token rotation) and removal (logout); a throwing listener can't break the write. - keychainMirror.ts: desktop only. Mirrors userId/deviceId/accessToken/ refreshToken (not the rest of the session); reads first and writes only when the copy differs, then verifies by reading back; serialized, 5 s timeouts; no session → clear (also covers a logout whose reload beat the clear). Every failure is a status, never an exception. A desktop build without the commands reads as "unsupported", so this can ship before the desktop side. - Settings → General (desktop): "Login in the system keychain" status. Tested: unit tests (fake keychain: store, no rewrite when current, rotation, clear, unsupported, missing commands, denied write, read-back mismatch, timeout); a simulated desktop app with a fake keychain, 14/14 (login mirrors only the secrets, Settings status, reload verifies without rewriting, logout clears, an existing session is mirrored after upgrade, Linux/denied show an honest status and stay logged in); the real Linux desktop binary (commands answer "unsupported", login unaffected, Settings says so). Unit 1295 pass, Playwright 20 passed. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA