feat(编辑器): 优化富文本工具栏样式切换逻辑，支持多种标签格式

src/components/Editor/RichTextEditor/RichTextEditor.tsx

@@ -455,7 +455,7 @@ export const RichTextEditor: React.FC<RichTextEditorProps> = ({
       />
 
       {/* 浮动工具栏放在编辑内容之后，避免 contenteditable 重绘时覆盖面板。 */}
-      {!readOnly && hasContent !== false && !tableContext && (
+      {!readOnly && hasContent !== false && (
         <RichTextToolbar
           position={toolbarPosition}
           editorElement={editorElement}

src/components/Editor/RichTextEditor/RichTextToolbar.tsx

@@ -563,7 +563,11 @@ export const RichTextToolbar: React.FC<RichTextToolbarProps> = ({
   const toggleFormat = useCallback((tagName: string) => {
     if (isTableMode && tableContext) {
       // 表格模式:切换单元格样式
-      const styleKey = tagName === 'strong' ? 'bold' : tagName === 'em' ? 'italic' : 'underline';
+      const tagLower = tagName.toLowerCase();
+      const styleKey = tagLower === 'strong' || tagLower === 'b' ? 'bold' 
+        : tagLower === 'em' || tagLower === 'i' ? 'italic' 
+        : 'underline';
+      
       const currentValue = styleKey === 'bold'
         ? allSelectedCellsHaveBold
         : styleKey === 'italic'