refactor: rename Quiet Hours to Idle Hours across all locales

The feature is fundamentally about time periods when the user is not
actively using Claude Code — the reset clock is unaffected because no
conversation is started. "Idle Hours" conveys this intent more clearly
than "Quiet Hours" (which implies only notification silencing).

Translations:
  en: Idle Hours
  nl: Inactieve uren
  fr: Heures inactives
  de: Inaktive Stunden
  ja: アイドル時間
  ko: 유휴 시간
  es: Horas inactivas
  zh-TW: 閒置時段

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/localization/dutch.rs

@@ -44,7 +44,7 @@ pub(super) const STRINGS: Strings = Strings {
     codex_window_title: "Codex-gebruiksmonitor",
     second_suffix: "s",
     show_pacing: "Pacingindicator tonen",
-    quiet_hours: "Stille uren",
+    quiet_hours: "Inactieve uren",
     quiet_start: "Begin",
     quiet_end: "Einde",
     quiet_set_time: "Tijd instellen...",

src/localization/english.rs

@@ -44,7 +44,7 @@ pub(super) const STRINGS: Strings = Strings {
     codex_token_expired_body: "Run 'codex' in a terminal and follow the sign-in prompts. After that, refresh or restart this app.",
     codex_window_title: "Codex Usage Monitor",
     second_suffix: "s",
-    quiet_hours: "Quiet Hours",
+    quiet_hours: "Idle Hours",
     quiet_start: "Start",
     quiet_end: "End",
     quiet_set_time: "Set time...",

src/localization/french.rs

@@ -44,7 +44,7 @@ pub(super) const STRINGS: Strings = Strings {
     codex_token_expired_body: "Executez 'codex' dans un terminal et suivez les instructions de connexion. Ensuite, actualisez ou redemarrez cette application.",
     codex_window_title: "Moniteur d'utilisation Codex",
     second_suffix: "s",
-    quiet_hours: "Quiet Hours",
+    quiet_hours: "Heures inactives",
     quiet_start: "Start",
     quiet_end: "End",
     quiet_set_time: "Définir l'heure...",

src/localization/german.rs

@@ -44,7 +44,7 @@ pub(super) const STRINGS: Strings = Strings {
     codex_token_expired_body: "Fuhren Sie 'codex' in einem Terminal aus und folgen Sie den Anmeldeanweisungen. Aktualisieren oder starten Sie diese App anschliessend neu.",
     codex_window_title: "Codex-Nutzungsmonitor",
     second_suffix: "s",
-    quiet_hours: "Quiet Hours",
+    quiet_hours: "Inaktive Stunden",
     quiet_start: "Start",
     quiet_end: "End",
     quiet_set_time: "Uhrzeit festlegen...",

src/localization/japanese.rs

@@ -44,7 +44,7 @@ pub(super) const STRINGS: Strings = Strings {
     codex_token_expired_body: "ターミナルで 'codex' を実行し、サインインの案内に従ってください。その後、このアプリを更新または再起動してください。",
     codex_window_title: "Codex 使用量モニター",
     second_suffix: "秒",
-    quiet_hours: "サイレント時間",
+    quiet_hours: "アイドル時間",
     quiet_start: "開始",
     quiet_end: "終了",
     quiet_set_time: "時刻を設定...",

src/localization/korean.rs

@@ -44,7 +44,7 @@ pub(super) const STRINGS: Strings = Strings {
     codex_token_expired_body: "터미널에서 'codex'를 실행하고 로그인 안내를 따르세요. 그런 다음 이 앱을 새로 고치거나 다시 시작하세요.",
     codex_window_title: "Codex 사용량 모니터",
     second_suffix: "초",
-    quiet_hours: "조용한 시간",
+    quiet_hours: "유휴 시간",
     quiet_start: "시작",
     quiet_end: "종료",
     quiet_set_time: "시간 설정...",

src/localization/spanish.rs

@@ -44,7 +44,7 @@ pub(super) const STRINGS: Strings = Strings {
     codex_token_expired_body: "Ejecuta 'codex' en una terminal y sigue las indicaciones de inicio de sesion. Despues, actualiza o reinicia esta aplicacion.",
     codex_window_title: "Monitor de uso de Codex",
     second_suffix: "s",
-    quiet_hours: "Quiet Hours",
+    quiet_hours: "Horas inactivas",
     quiet_start: "Start",
     quiet_end: "End",
     quiet_set_time: "Set time...",

src/localization/traditional_chinese.rs

@@ -44,7 +44,7 @@ pub(super) const STRINGS: Strings = Strings {
     codex_token_expired_body: "請在終端機中執行 'codex'，並依照登入提示操作。完成後，請重新整理或重新啟動此應用程式。",
     codex_window_title: "Codex 使用量監控",
     second_suffix: "秒",
-    quiet_hours: "安靜時刻",
+    quiet_hours: "閒置時段",
     quiet_start: "開始時間",
     quiet_end: "結束時間",
     quiet_set_time: "設定時間...",