fix(tui): isolate i18n locale in tests to eliminate parallel flake

Cargo.toml

@@ -117,6 +117,7 @@ mach2 = "0.6.0"
 [dev-dependencies]
 insta = "1"
 mockall = "0.13"
+parking_lot = "0.12"
 tempfile = "3"
 anyhow = "1"
 

src/tui/components/generator_panel.rs

@@ -297,6 +297,7 @@ mod tests {
 
     #[test]
     fn render_embedded_has_no_style_selector() {
+        let _guard = crate::tui::i18n::LocaleGuard::en();
         let state = GeneratorState::new();
         let lines = render_generator_panel(&state, true, 56, true);
         let style_label = t!("tui.generator.style_label").to_string();

src/tui/components/text_input.rs

@@ -284,6 +284,7 @@ mod tests {
 
     #[test]
     fn render_text_input_shows_label() {
+        let _guard = crate::tui::i18n::LocaleGuard::en();
         let lines = render_text_input("name", "GitHub", false, false, true, false, 60);
         assert_eq!(lines.len(), 1);
     }
@@ -298,13 +299,15 @@ mod tests {
 
     #[test]
     fn render_masked_input_shows_dots() {
+        let _guard = crate::tui::i18n::LocaleGuard::en();
         let lines = render_text_input("pass", "secret", false, false, true, true, 60);
         let text: String = lines[0].spans.iter().map(|s| s.content.as_ref()).collect();
         assert!(text.contains("\u{2022}\u{2022}\u{2022}\u{2022}\u{2022}\u{2022}"));
     }
 
     #[test]
     fn render_password_input_visible_shows_plaintext() {
+        let _guard = crate::tui::i18n::LocaleGuard::en();
         let buttons = [
             PasswordButton {
                 label: "显示".to_string(),
@@ -324,6 +327,7 @@ mod tests {
 
     #[test]
     fn render_password_input_masked_shows_bullets() {
+        let _guard = crate::tui::i18n::LocaleGuard::en();
         let buttons = [PasswordButton {
             label: "显示".to_string(),
             focus_variant: PasswordFieldFocus::Show,

src/tui/i18n/mod.rs

@@ -71,20 +71,22 @@ pub fn switch_locale(locale: &str) {
 }
 
 #[cfg(test)]
-static LOCALE_LOCK: std::sync::Mutex<()> = std::sync::Mutex::new(());
+static LOCALE_LOCK: parking_lot::ReentrantMutex<()> = parking_lot::const_reentrant_mutex(());
 
 /// RAII guard that serializes locale-dependent tests and restores locale on drop.
-/// Uses a process-wide mutex so no two locale-sensitive tests run concurrently.
+/// Uses a process-wide reentrant mutex so no two locale-sensitive tests run
+/// concurrently, while still allowing a single test to nest guards (e.g. an
+/// outer manual guard plus an inner render-helper guard) without deadlocking.
 #[cfg(test)]
 pub struct LocaleGuard {
     original: String,
-    _lock: std::sync::MutexGuard<'static, ()>,
+    _lock: parking_lot::ReentrantMutexGuard<'static, ()>,
 }
 
 #[cfg(test)]
 impl LocaleGuard {
     pub fn new(locale: &str) -> Self {
-        let lock = LOCALE_LOCK.lock().unwrap_or_else(|e| e.into_inner());
+        let lock = LOCALE_LOCK.lock();
         let original = rust_i18n::locale().to_string();
         init(locale);
         Self {

src/tui/screens/database_recovery.rs

@@ -1342,6 +1342,7 @@ mod tests {
 
     #[test]
     fn enter_on_okb_without_path_sets_error() {
+        let _guard = crate::tui::i18n::LocaleGuard::en();
         let mut screen = DatabaseRecoveryScreen::new(DatabaseRecoveryOrigin::StartupKeyOnly);
         screen.focus = DatabaseRecoveryFocus::Okb;
         screen.mode = DatabaseRecoveryMode::OkbPathInput;

src/tui/screens/form/render.rs

@@ -938,6 +938,7 @@ mod tests {
 
     #[test]
     fn weak_password_dialog_renders_actions_and_newlook_warning_icon() {
+        let _guard = crate::tui::i18n::LocaleGuard::en();
         let backend = TestBackend::new(80, 24);
         let mut terminal = Terminal::new(backend).unwrap();
         terminal
@@ -955,6 +956,7 @@ mod tests {
 
     #[test]
     fn unfocused_notes_textarea_does_not_render_cursor_style() {
+        let _guard = crate::tui::i18n::LocaleGuard::en();
         let mut state = FormState::new_edit(uuid::Uuid::nil(), CredentialType::Login);
         state.fields.name = "Example".into();
         state.fields.set_notes_text("internal notes");

src/tui/screens/key_recovery.rs

@@ -461,6 +461,7 @@ mod tests {
 
     #[test]
     fn confirm_with_incomplete_words_sets_inline_error() {
+        let _guard = crate::tui::i18n::LocaleGuard::en();
         let mut screen = KeyRecoveryScreen::new(KeyRecoveryOrigin::OnboardingRestore);
         screen.focus = KeyRecoveryFocus::Confirm;
         let result = screen.handle_key_for_test(key(KeyCode::Enter));

src/tui/screens/main/detail.rs

@@ -1974,6 +1974,7 @@ mod tests {
 
     #[test]
     fn render_trash_detail_empty() {
+        let _guard = crate::tui::i18n::LocaleGuard::en();
         let mut state = DetailPanelState::default();
         state.set_trash_context(true, 30);
         let result = render_detail_snapshot(&state, 60, 20, true, true);