Fix Notion reconnect prompt after app restart

[aseembits93]

Summary

• verify macOS Keychain writes with an uncached read before caching or accepting the connection
• clear stale in-process credentials before writes so failed persistence cannot look healthy until restart
• distinguish a genuinely missing Keychain item from locked/unavailable Keychain failures
• document durable credential verification as a reliability invariant

Tests

• cargo test -p locality-store
• cargo test -p locality-store credentials::tests --lib
• cargo test -p locality-desktop desktop_snapshot_marks_missing_credential_as_reconnect_needed_without_losing_mount --bin locality-desktop
• cargo test -p loc-cli --test connect connect_notion -- --nocapture
• cargo fmt --all -- --check
• git diff --check

Notes

A strict workspace Clippy run is currently blocked by pre-existing warnings outside this change, beginning with crates/locality-core/src/conflict.rs:307 and existing locality-store/src/sqlite.rs warnings.

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Project	Deployment	Actions	Updated (UTC)
locality	Ready	Preview	Aug 19, 2026 8:01pm