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Reopening SQLKit after the access token expires can sign the user out because device activation serializes the refresh token under a different key than the frontend reads. Save the activation lease correctly and keep replacement credentials synchronized through both command results and events.

• Register session listeners and consume pending authentication before restoring a saved login; deduplicate repeated handoffs.
• Ignore asynchronous results from older logins or already-replaced leases, and clear account-scoped UI state when a new login arrives.
• Share successful renewal results across concurrent callers, including queued requests across sleep/resume; allow an access-only session to repair its missing lease despite the activation throttle.
• Add regressions for IPC serialization, persisted restoration, transient failures, concurrent rotation, missed events, and stale responses.

Validation:

• npm test and cargo test --manifest-path src-tauri/Cargo.toml --lib: 855 frontend tests and 598 Rust tests passed; one existing Rust test ignored.
• npm run build passed.
• npm run lint:check passed.