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Logout left lotus-per-user-volume (Element Call's per-person volume map: whom the previous user called and turned up/down; same origin on the web) and settings-sync-meta:<userId> (a key naming the account) in localStorage. clearPlaintextCaches now removes both; device preferences (`settings`) are kept as before. Verified: after joining/leaving a call and logging out via Settings, both keys are gone (unit test added). Fixes #347 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5