分享码功能的实现，并修复了几个 bug

client/src/locales/data-en.json

@@ -287,6 +287,10 @@
       "addPresetTitle": "New preset",
       "addPresetNameEmpty": "Name cannot be empty",
       "addPresetNameExists": "That name already exists. Choose another.",
+      "overwritePresetTitle": "Preset name already exists",
+      "overwritePresetDesc": "A preset named \"{{name}}\" already exists. Overwrite it?",
+      "overwritePresetConfirm": "Overwrite",
+      "overwritePresetCancelled": "Cancelled",
       "toastAddPresetOk": "Preset added",
       "toastAddPresetFail": "Failed to add preset",
       "toastPresetLimitReached": "Preset limit reached ({{max}}). Delete some presets before adding more.",
@@ -360,6 +364,8 @@
       "shareCodeLabel": "Share Code",
       "shareCopied": "Code copied",
       "shareGenerating": "Generating…",
+      "shareCreateFail": "Failed to generate share code",
+      "shareExpireAt": "Expires at",
       "importTab": "Import EQ",
       "importCodeHint": "Enter or paste the 5-character share code",
       "importQuery": "Query",
@@ -367,13 +373,16 @@
       "importCodeNotFound": "Share code not found",
       "importEqName": "EQ Name",
       "importButton": "Import",
+      "importSaving": "Importing…",
       "importSuccess": "EQ imported successfully",
+      "importFail": "Failed to import EQ",
       "mySharesTab": "My Shares",
       "mySharesLoading": "Loading…",
       "mySharesEmpty": "No shared EQ yet",
       "mySharesCode": "Code",
       "mySharesName": "EQ Name",
-      "mySharesLoadFail": "Failed to load share list"
+      "mySharesLoadFail": "Failed to load share list",
+      "importCodeNotFound": "Share code not found or expired"
     }
   },
   "dac": {

client/src/locales/data-zh-HK.json

@@ -223,6 +223,10 @@
       "addPresetTitle": "新增預設",
       "addPresetNameEmpty": "名稱不能為空",
       "addPresetNameExists": "名稱已存在，請修改後再儲存",
+      "overwritePresetTitle": "預設名稱已存在",
+      "overwritePresetDesc": "預設「{{name}}」已存在，確認覆蓋原有資料嗎？",
+      "overwritePresetConfirm": "覆蓋",
+      "overwritePresetCancelled": "已取消",
       "toastAddPresetOk": "已新增預設",
       "toastAddPresetFail": "新增預設失敗",
       "toastPresetLimitReached": "預設已達上限（{{max}} 個），請先清理後再操作",
@@ -296,6 +300,8 @@
       "shareCodeLabel": "分享碼",
       "shareCopied": "已複製分享碼",
       "shareGenerating": "產生中…",
+      "shareCreateFail": "產生分享碼失敗",
+      "shareExpireAt": "有效期至",
       "importTab": "匯入 EQ",
       "importCodeHint": "輸入或貼上 5 位分享碼",
       "importQuery": "查詢",
@@ -303,13 +309,16 @@
       "importCodeNotFound": "分享碼不存在",
       "importEqName": "EQ 名稱",
       "importButton": "匯入",
+      "importSaving": "匯入中…",
       "importSuccess": "EQ 匯入成功",
+      "importFail": "EQ 匯入失敗",
       "mySharesTab": "我的分享",
       "mySharesLoading": "載入中…",
       "mySharesEmpty": "暫無分享記錄",
       "mySharesCode": "分享碼",
       "mySharesName": "EQ 名稱",
-      "mySharesLoadFail": "載入分享列表失敗"
+      "mySharesLoadFail": "載入分享列表失敗",
+      "importCodeNotFound": "分享碼不存在或已過期"
     }
   },
   "dac": {

client/src/locales/data-zh.json

@@ -223,6 +223,10 @@
       "addPresetTitle": "新增预设",
       "addPresetNameEmpty": "名称不能为空",
       "addPresetNameExists": "名称已存在，请修改后再保存",
+      "overwritePresetTitle": "预设名称已存在",
+      "overwritePresetDesc": "预设「{{name}}」已存在，确认覆盖原有数据吗？",
+      "overwritePresetConfirm": "覆盖",
+      "overwritePresetCancelled": "已取消",
       "toastAddPresetOk": "已新增预设",
       "toastAddPresetFail": "新增预设失败",
       "toastPresetLimitReached": "预设已达上限（{{max}} 个），请先清理后再操作",
@@ -296,6 +300,8 @@
       "shareCodeLabel": "分享码",
       "shareCopied": "已复制分享码",
       "shareGenerating": "生成中…",
+      "shareCreateFail": "生成分享码失败",
+      "shareExpireAt": "有效期至",
       "importTab": "导入 EQ",
       "importCodeHint": "输入或粘贴 5 位分享码",
       "importQuery": "查询",
@@ -303,13 +309,16 @@
       "importCodeNotFound": "分享码不存在",
       "importEqName": "EQ 名称",
       "importButton": "导入",
+      "importSaving": "导入中…",
       "importSuccess": "EQ 导入成功",
+      "importFail": "EQ 导入失败",
       "mySharesTab": "我的分享",
       "mySharesLoading": "加载中…",
       "mySharesEmpty": "暂无分享记录",
       "mySharesCode": "分享码",
       "mySharesName": "EQ 名称",
-      "mySharesLoadFail": "加载分享列表失败"
+      "mySharesLoadFail": "加载分享列表失败",
+      "importCodeNotFound": "分享码不存在或已过期"
     }
   },
   "dac": {