feat(quota): improve refresh button functionality and update translations

- Added a new `isRefreshing` state to streamline loading logic for the refresh button.
- Updated the refresh button's disabled and loading states for better user experience.
- Simplified the refresh button content display.
- Revised translations for the refresh action in both English and Chinese locales.
- Enhanced styles for button alignment and SVG display.

src/components/quota/QuotaSection.tsx

@@ -211,6 +211,8 @@ export function QuotaSection<TState extends QuotaStatusState, TData>({
     </div>
   );
 
+  const isRefreshing = sectionLoading || loading;
+
   return (
     <Card
       title={titleNode}
@@ -242,14 +244,12 @@ export function QuotaSection<TState extends QuotaStatusState, TData>({
             variant="secondary"
             size="sm"
             onClick={handleRefresh}
-            disabled={disabled || sectionLoading || loading || filteredFiles.length === 0}
-            loading={sectionLoading || loading}
+            disabled={disabled || isRefreshing || filteredFiles.length === 0}
+            loading={isRefreshing}
             title={t('quota_management.refresh_files_and_quota')}
+            aria-label={t('quota_management.refresh_files_and_quota')}
           >
-            <span className={styles.refreshButtonContent}>
-              {!sectionLoading && !loading && <IconRefreshCw size={18} />}
-              {t('quota_management.refresh_files_and_quota')}
-            </span>
+            {!isRefreshing && <IconRefreshCw size={16} />}
           </Button>
         </div>
       }

src/i18n/locales/en.json

@@ -713,7 +713,7 @@
     "title": "Quota Management",
     "description": "Monitor OAuth quota status for Antigravity, Codex, and Gemini CLI credentials.",
     "refresh_files": "Refresh auth files",
-    "refresh_files_and_quota": "Refresh auth files & page quota"
+    "refresh_files_and_quota": "Refresh files & quota"
   },
   "system_info": {
     "title": "Management Center Info",

src/i18n/locales/zh-CN.json

@@ -713,7 +713,7 @@
     "title": "配额管理",
     "description": "集中查看 OAuth 额度与剩余情况",
     "refresh_files": "刷新认证文件",
-    "refresh_files_and_quota": "刷新认证文件列表&当前页额度"
+    "refresh_files_and_quota": "刷新认证文件&额度"
   },
   "system_info": {
     "title": "管理中心信息",

src/pages/QuotaPage.module.scss

@@ -31,6 +31,14 @@
   gap: $spacing-sm;
   flex-wrap: wrap;
   align-items: center;
+
+  :global(.btn-sm) {
+    line-height: 16px;
+  }
+
+  :global(svg) {
+    display: block;
+  }
 }
 
 .titleWrapper {
@@ -136,13 +144,6 @@
   align-items: center;
 }
 
-.refreshButtonContent {
-  display: inline-flex;
-  align-items: center;
-  gap: $spacing-xs;
-  white-space: nowrap;
-}
-
 .antigravityCard {
   background-image: linear-gradient(180deg,
       rgba(224, 247, 250, 0.12),