feat(wallets): fixed max-height list + manage scanned folders

Two wallets-modal changes:

- The wallet list now always renders at its max height (kMaxVisibleRows) instead
  of shrinking to the wallet count, so the modal is a consistent size whether you
  have one wallet or many — fewer rows leave empty space, more than 7 scroll.

- Add a "Scanned folders" manager: each user-added scan folder is listed with a
  control to stop scanning it (removeExtraFolder + save + re-scan so its wallets
  drop out). Paths front-elide to keep the identifying leaf visible, with a
  full-path tooltip. The card-height math reserves the manager's rows so nothing
  clips. Two new i18n keys (wallets_scanned_folders / wallets_remove_folder),
  translated across all 8 languages; CJK subset rebuilt.

Verified on the sweep at 1.0 and 1.5x DPI: max-height list on both the few- and
many-wallet surfaces, the folder manager renders and stays clear of the footer.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

scripts/add_missing_translations.py

@@ -2232,6 +2232,18 @@ TRANSLATIONS = {
         "ja": "データディレクトリの外 —「開く」はその場でリンクします（コピーなし）。",
         "ko": "데이터 디렉터리 밖 — '열기'는 제자리에 링크합니다 (복사 없음)."
     },
+    "wallets_scanned_folders": {
+        "es": "Carpetas escaneadas:", "de": "Durchsuchte Ordner:",
+        "fr": "Dossiers analysés :", "pt": "Pastas verificadas:",
+        "ru": "Просканированные папки:", "zh": "已扫描的文件夹：",
+        "ja": "スキャン対象フォルダー：", "ko": "스캔한 폴더:"
+    },
+    "wallets_remove_folder": {
+        "es": "Dejar de escanear esta carpeta", "de": "Diesen Ordner nicht mehr durchsuchen",
+        "fr": "Ne plus analyser ce dossier", "pt": "Parar de verificar esta pasta",
+        "ru": "Больше не сканировать эту папку", "zh": "停止扫描此文件夹",
+        "ja": "このフォルダーのスキャンを停止", "ko": "이 폴더 스캔 중지"
+    },
 }
 
 def main():