fix(ui): 批量替换所有组件中残留的硬编码深色值以彻底支持浅色主题

app/components/Auth/OAuthButtons.vue

@@ -141,21 +141,21 @@ const loginWith = (provider: string) => {
 }
 
 .oauth-btn-github:hover {
-  background: #24292e;
-  color: #ffffff;
-  border-color: #24292e;
+  background: var(--bg-tertiary, #24292e);
+  color: var(--text-primary, #ffffff);
+  border-color: var(--border-secondary, #24292e);
 }
 
 .oauth-btn-google:hover {
-  background: #ffffff;
-  color: #111111;
+  background: var(--card-bg, #ffffff);
+  color: var(--text-primary, #111111);
   border-color: #dadce0;
 }
 
 .oauth-btn-aggregate:hover {
-  background: #12b7f5;
-  color: #ffffff;
-  border-color: #12b7f5;
+  background: var(--bg-secondary, #12b7f5);
+  color: var(--text-primary, #ffffff);
+  border-color: var(--border-secondary, #12b7f5);
 }
 
 .oauth-empty-hint {