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The process-global rust_i18n locale caused flaky failures under parallel test execution. Tests such as render_expired_badge_in_list and sync_indicator_ascii_fallbacks held no locale guard, so they could read a locale mutated by a concurrent zh-CN guard holder and assert the wrong localized text. Root cause: LocaleGuard serialized only guard holders via a std::sync::Mutex. Tests that depended on the locale without holding a guard raced against those that did, and the non-reentrant mutex precluded nesting. Changes: - i18n: LOCALE_LOCK is now a parking_lot::ReentrantMutex so a manual LocaleGuard can nest inside a render-helper guard without deadlocking. - list tests: render_snapshot/render_buffer gain _locale variants that hold an internal LocaleGuard (default delegates to "en"). The two zh-CN timestamp tests are migrated to render_buffer_locale(.., "zh-CN"). - Add a deterministic concurrent-isolation test (proves en renders stay correct under concurrent zh-CN guard holders) and a localized-helper contract test (en "Expired" / zh-CN "已过期"). - Add LocaleGuard::en() to 85 locale-dependent tests across 14 files that previously had no guard. Verified: cargo fmt --check, cargo clippy --all-targets -- -D warnings, cargo test (2595 + all integration/snapshot/e2e) run 3x, cargo build --release --bin ok, cargo audit (0 vulnerabilities). render_expired_badge_in_list and sync_indicator_ascii_fallbacks are now stable across runs.
fix(tui): isolate i18n locale in tests to eliminate parallel flake
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