fix(theme): 优化深色模式二级菜单悬浮颜色

- 二级菜单使用主题变量替代硬编码颜色
- hover 背景使用 floatingBtnBg 增强与背景区分度
- 同步 floating 变量到 dropdown 元素

src/components/button-group/index.css

@@ -474,34 +474,34 @@
 
 /* glass-pill 二级菜单 - 深色主题 */
 .opt-btn-dropdown.type-glass-pill.theme-dark {
-    background: rgba(21, 34, 50, 0.98);
+    background: var(--bim-bg-overlay);
     backdrop-filter: blur(10px);
     -webkit-backdrop-filter: blur(10px);
-    border: 1px solid rgba(51, 65, 85, 0.5);
-    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
+    border: 1px solid var(--bim-border-default);
+    box-shadow: var(--bim-shadow-lg);
 }
 
 .opt-btn-dropdown.type-glass-pill.theme-dark .opt-btn-dropdown-item {
-    color: #ffffff;
+    color: var(--bim-text-primary);
 }
 
 .opt-btn-dropdown.type-glass-pill.theme-dark .opt-btn-dropdown-item:hover {
-    background: #1f2d3e;
+    background: var(--bim-floating-btn-bg);
 }
 
 .opt-btn-dropdown.type-glass-pill.theme-dark .opt-btn-dropdown-item:active {
-    background: #2a3f54;
+    background: var(--bim-floating-btn-bg-hover);
 }
 
 .opt-btn-dropdown.type-glass-pill.theme-dark .opt-btn-dropdown-item.active {
-    background: rgb(59, 130, 246);
-    color: white;
+    background: var(--bim-primary);
+    color: var(--bim-text-inverse);
 }
 
 .opt-btn-dropdown.type-glass-pill.theme-dark .opt-btn-dropdown-item .opt-btn-icon {
-    color: #ffffff;
+    color: var(--bim-floating-icon-color);
 }
 
 .opt-btn-dropdown.type-glass-pill.theme-dark .opt-btn-dropdown-item .opt-btn-dropdown-label {
-    color: #ffffff;
+    color: var(--bim-text-primary);
 }

src/components/button-group/index.ts

@@ -309,15 +309,13 @@ export class BimButtonGroup implements IBimComponent {
 
             style.setProperty('--bim-primary', theme.primary);
             style.setProperty('--bim-bg-overlay', theme.bgOverlay);
-            style.setProperty('--bim-bg-glass-blur', theme.bgGlassBlur);
-            style.setProperty('--bim-border-subtle', theme.borderSubtle);
+            style.setProperty('--bim-border-default', theme.borderDefault);
             style.setProperty('--bim-text-primary', theme.textPrimary);
             style.setProperty('--bim-text-inverse', theme.textInverse);
-            style.setProperty('--bim-icon-default', theme.iconDefault);
-            style.setProperty('--bim-icon-inverse', theme.iconInverse);
-            style.setProperty('--bim-component-bg-hover', theme.componentBgHover);
-            style.setProperty('--bim-component-bg-active', theme.componentBgActive);
             style.setProperty('--bim-shadow-lg', theme.shadowLg);
+            style.setProperty('--bim-floating-btn-bg', theme.floatingBtnBg);
+            style.setProperty('--bim-floating-btn-bg-hover', theme.floatingBtnBgHover);
+            style.setProperty('--bim-floating-icon-color', theme.floatingIconColor);
         });
     }
 
@@ -633,7 +631,16 @@ export class BimButtonGroup implements IBimComponent {
         const currentTheme = themeManager.getTheme();
         dropdown.classList.add(`theme-${currentTheme.name}`);
 
-        // 先添加到 DOM 以便计算尺寸
+        dropdownStyle.setProperty('--bim-primary', currentTheme.primary);
+        dropdownStyle.setProperty('--bim-bg-overlay', currentTheme.bgOverlay);
+        dropdownStyle.setProperty('--bim-border-default', currentTheme.borderDefault);
+        dropdownStyle.setProperty('--bim-text-primary', currentTheme.textPrimary);
+        dropdownStyle.setProperty('--bim-text-inverse', currentTheme.textInverse);
+        dropdownStyle.setProperty('--bim-shadow-lg', currentTheme.shadowLg);
+        dropdownStyle.setProperty('--bim-floating-btn-bg', currentTheme.floatingBtnBg);
+        dropdownStyle.setProperty('--bim-floating-btn-bg-hover', currentTheme.floatingBtnBgHover);
+        dropdownStyle.setProperty('--bim-floating-icon-color', currentTheme.floatingIconColor);
+
         document.body.appendChild(dropdown);
 
         // 添加事件拦截