i18n(sidebar): translate the folder-scan strings

The sidebar's "Scan this folder" entry and its vanished-folder warning were the
last 2 [TODO: Translate] keys, so grep -c "TODO: Translate" locales/*.json is 0
everywhere again.

  scanFolder              zh-CN 扫描此文件夹 · zh-TW 掃描此資料夾 · ja このフォルダをスキャン
                          ko 이 폴더 스캔 · fr Analyser ce dossier · de Diesen Ordner scannen
                          es Escanear esta carpeta · ru Сканировать эту папку · he סרוק תיקייה זו
  scanFolderResult.missing
                          reused verbatim from each locale's existing
                          renameFolderResult.missing / deleteFolderResult.missing — the situation
                          is identical ("the folder vanished before the action ran"), so a third
                          variant of the same sentence would only be a translation drift risk.

The label follows each locale's "Check for updates in this folder" phrasing
(检查此文件夹的更新 → 扫描此文件夹, Vérifier les mises à jour dans ce dossier → Analyser ce
dossier) so the two refresh entries in the same menu read as a pair.
docs/i18n-translation-guidelines.md gains the two rows in "Scoped scan and root
availability" plus the updated status note.

Verified: python scripts/sync_translation_keys.py --dry-run reports no pending
changes, pytest tests/i18n 20 passed, frontend 1495 passed.

docs/i18n-translation-guidelines.md

@@ -155,7 +155,9 @@ Locales: `en`, `zh-CN`, `zh-TW`, `ja`, `ko`, `fr`, `de`, `es`, `ru`, `he` (RTL).
 > (`loras.controls.refresh.scopeSection` / `.rootOffline` / `.rootModels`) and the scan result
 > toasts (`toast.api.refreshCompleteScoped`, `.refreshKeptUnreachable`, `.scanRootUnreachable`),
 > 6 keys in total, translated in all 9 locales in the same pass (renderings in §2, "Scoped scan
-> and root availability"), so the "no remaining placeholders" claim holds again.
+> and root availability"). The sidebar's folder-level follow-up added 2 more
+> (`sidebar.scanFolder`, `sidebar.scanFolderResult.missing`), translated in a second pass, so the
+> "no remaining placeholders" claim holds again.
 
 > **Status (2026-10, reconcile walk progress):** a regular Refresh now reports the reconcile
 > walk per model root (which roots are being checked, how many model files have been seen, and
@@ -744,6 +746,9 @@ be read (an unreachable drive is no longer treated as deleted).
 | `refreshKeptUnreachable` ("{count} models kept: {paths} not reachable") | zh-CN 已保留 {count} 个模型：{paths} 当前不可访问 · zh-TW 已保留 {count} 個模型：{paths} 目前無法存取 · ja {count} 個のモデルを保持しました：{paths} にアクセスできません · ko 모델 {count}개 유지됨: {paths}에 접근할 수 없음 · fr {count} modèles conservés : {paths} inaccessible(s) · de {count} Modelle beibehalten: {paths} nicht erreichbar · es {count} modelos conservados: {paths} no accesible(s) · ru Сохранено моделей: {count} — {paths} недоступны · he נשמרו {count} מודלים: {paths} אינם זמינים |
 | `scanRootUnreachable` ("{scope} is not reachable right now. Nothing was changed.") | zh-CN {scope} 当前不可访问，未做任何改动。 · zh-TW {scope} 目前無法存取，未做任何變更。 · ja {scope} に現在アクセスできません。変更は行われていません。 · ko {scope}에 현재 접근할 수 없습니다. 변경된 내용은 없습니다. · fr {scope} est actuellement inaccessible. Aucune modification n’a été apportée. · de {scope} ist derzeit nicht erreichbar. Es wurde nichts geändert. · es {scope} no es accesible ahora mismo. No se ha cambiado nada. · ru {scope} сейчас недоступен. Изменений не внесено. · he {scope} אינו זמין כעת. לא בוצעו שינויים. |
 
+| `sidebar.scanFolder` ("Scan this folder") | zh-CN 扫描此文件夹 · zh-TW 掃描此資料夾 · ja このフォルダをスキャン · ko 이 폴더 스캔 · fr Analyser ce dossier · de Diesen Ordner scannen · es Escanear esta carpeta · ru Сканировать эту папку · he סרוק תיקייה זו |
+| `sidebar.scanFolderResult.missing` | identical to `sidebar.renameFolderResult.missing` / `deleteFolderResult.missing` in every locale (the folder vanished between the menu opening and the click) — reuse that rendering rather than writing a third variant |
+
 `{scope}` is a root label (`G: loras`) or a folder path, `{paths}` is a comma-joined list capped
 at three entries, and both counts arrive pre-formatted. "Offline" describes a configured root
 whose directory cannot be read right now (drive switched off, unmounted share) — it is a state of

locales/de.json

@@ -1483,9 +1483,9 @@
             "none": "Alle {type}s in diesem Ordner sind aktuell",
             "error": "Fehler beim Prüfen des Ordners auf {type}-Updates: {message}"
         },
-        "scanFolder": "[TODO: Translate] Scan this folder",
+        "scanFolder": "Diesen Ordner scannen",
         "scanFolderResult": {
-            "missing": "[TODO: Translate] This folder no longer exists on disk. Refresh the sidebar and try again."
+            "missing": "Dieser Ordner existiert nicht mehr auf dem Datenträger. Aktualisieren Sie die Seitenleiste und versuchen Sie es erneut."
         }
     },
     "statistics": {

locales/es.json

@@ -1483,9 +1483,9 @@
             "none": "Todos los {type}s en esta carpeta están actualizados",
             "error": "Error al buscar actualizaciones de {type} en la carpeta: {message}"
         },
-        "scanFolder": "[TODO: Translate] Scan this folder",
+        "scanFolder": "Escanear esta carpeta",
         "scanFolderResult": {
-            "missing": "[TODO: Translate] This folder no longer exists on disk. Refresh the sidebar and try again."
+            "missing": "Esta carpeta ya no existe en el disco. Actualiza la barra lateral e inténtalo de nuevo."
         }
     },
     "statistics": {

locales/fr.json

@@ -1483,9 +1483,9 @@
             "none": "Tous les {type}s dans ce dossier sont à jour",
             "error": "Échec de la vérification des mises à jour {type} dans ce dossier : {message}"
         },
-        "scanFolder": "[TODO: Translate] Scan this folder",
+        "scanFolder": "Analyser ce dossier",
         "scanFolderResult": {
-            "missing": "[TODO: Translate] This folder no longer exists on disk. Refresh the sidebar and try again."
+            "missing": "Ce dossier n’existe plus sur le disque. Actualisez la barre latérale et réessayez."
         }
     },
     "statistics": {

locales/he.json

@@ -1483,9 +1483,9 @@
             "none": "כל ה-{type}s בתיקייה זו מעודכנים",
             "error": "נכשל בבדיקת עדכוני {type} בתיקייה: {message}"
         },
-        "scanFolder": "[TODO: Translate] Scan this folder",
+        "scanFolder": "סרוק תיקייה זו",
         "scanFolderResult": {
-            "missing": "[TODO: Translate] This folder no longer exists on disk. Refresh the sidebar and try again."
+            "missing": "תיקייה זו אינה קיימת עוד בדיסק. רענן את סרגל הצד ונסה שוב."
         }
     },
     "statistics": {

locales/ja.json

@@ -1483,9 +1483,9 @@
             "none": "このフォルダのすべての{type}sは最新です",
             "error": "フォルダの{type}アップデート確認に失敗しました: {message}"
         },
-        "scanFolder": "[TODO: Translate] Scan this folder",
+        "scanFolder": "このフォルダをスキャン",
         "scanFolderResult": {
-            "missing": "[TODO: Translate] This folder no longer exists on disk. Refresh the sidebar and try again."
+            "missing": "このフォルダはディスク上に存在しません。サイドバーを再読み込みしてからもう一度お試しください。"
         }
     },
     "statistics": {

locales/ko.json

@@ -1483,9 +1483,9 @@
             "none": "이 폴더의 모든 {type}s가 최신 상태입니다",
             "error": "폴더의 {type} 업데이트 확인 실패: {message}"
         },
-        "scanFolder": "[TODO: Translate] Scan this folder",
+        "scanFolder": "이 폴더 스캔",
         "scanFolderResult": {
-            "missing": "[TODO: Translate] This folder no longer exists on disk. Refresh the sidebar and try again."
+            "missing": "이 폴더는 디스크에 더 이상 존재하지 않습니다. 사이드바를 새로 고친 후 다시 시도하세요."
         }
     },
     "statistics": {

locales/ru.json

@@ -1483,9 +1483,9 @@
             "none": "Все {type}s в этой папке актуальны",
             "error": "Не удалось проверить папку на наличие обновлений {type}: {message}"
         },
-        "scanFolder": "[TODO: Translate] Scan this folder",
+        "scanFolder": "Сканировать эту папку",
         "scanFolderResult": {
-            "missing": "[TODO: Translate] This folder no longer exists on disk. Refresh the sidebar and try again."
+            "missing": "Эта папка больше не существует на диске. Обновите боковую панель и повторите попытку."
         }
     },
     "statistics": {

locales/zh-CN.json

@@ -1483,9 +1483,9 @@
             "none": "此文件夹中的所有{type}都是最新版本",
             "error": "检查文件夹{type}更新失败: {message}"
         },
-        "scanFolder": "[TODO: Translate] Scan this folder",
+        "scanFolder": "扫描此文件夹",
         "scanFolderResult": {
-            "missing": "[TODO: Translate] This folder no longer exists on disk. Refresh the sidebar and try again."
+            "missing": "该文件夹在磁盘上已不存在，请刷新侧边栏后重试。"
         }
     },
     "statistics": {

locales/zh-TW.json

@@ -1483,9 +1483,9 @@
             "none": "此資料夾中的所有{type}都是最新版本",
             "error": "檢查資料夾{type}更新失敗: {message}"
         },
-        "scanFolder": "[TODO: Translate] Scan this folder",
+        "scanFolder": "掃描此資料夾",
         "scanFolderResult": {
-            "missing": "[TODO: Translate] This folder no longer exists on disk. Refresh the sidebar and try again."
+            "missing": "該資料夾在磁碟上已不存在，請重新整理側邊欄後再試。"
         }
     },
     "statistics": {