deserialize_sections tried each top-level key against a document holding every key accepted
before it, cloning and deserializing the growing document per key. A config.toml with many
unknown keys took quadratic time (20k keys: >2 minutes, now <1 s). Each key is now checked
against the defaults plus that key, and accepted keys are merged once.
CodeRabbit CWE-407, crates/settings/src/document.rs:47
Add shared config.toml storage while keeping settings types, defaults and UI policy in each app.
Includes isolated in-memory operation, configurable portable paths, atomic saves with private backups, damaged-file preservation, schema migrations, and documented best-effort handling of external edits.
Validation: native macOS formatting, strict workspace clippy, 172 workspace tests and the craft-settings WASM check. Independent backup-permission and failed external-migration repros fail before the fixes and pass afterward.
Hosted CI: all seven UI and printing jobs pass across macOS, Linux, Windows and UI WASM.
Refs #12
Dylan M. Taylor
skylartaylor
Alejandro Londono