feat: add study modes to Memorize page

- Add 4 study modes: order-limited, order-infinite, random-limited, random-infinite
- Add mode selector buttons with icons
- Update progress display for infinite modes
- Add translations for all 8 locales

messages/ja-JP.json

@@ -297,7 +297,12 @@
       "typeWhatYouHear": "聞こえた内容を入力",
       "correct": "正解",
       "incorrect": "不正解",
-      "nextCard": "次へ"
+      "nextCard": "次へ",
+      "modeOrderLimited": "順序",
+      "modeOrderInfinite": "ループ",
+      "modeRandomLimited": "ランダム",
+      "modeRandomInfinite": "ランダムループ",
+      "restart": "最初から"
     },
     "page": {
       "unauthorized": "このデッキにアクセスする権限がありません"