fix: address copy functionality and code logic issues for #1828

- utils.jsx: Replace input with textarea in copy function to preserve line breaks in multi-line content, preventing formatting loss mentioned in #1828
- api.js: Fix duplicate 'group' property in buildApiPayload to resolve syntax issues
- MarkdownRenderer.jsx: Refactor code text extraction using textContent for accurate copying

Closes #1828

Signed-off-by: Zhaokun Zhang <zhaokunzhang@Zhaokuns-Air.lan>

web/src/components/common/markdown/MarkdownRenderer.jsx

@@ -181,8 +181,8 @@ export function PreCode(props) {
                 e.preventDefault();
                 e.stopPropagation();
                 if (ref.current) {
-                  const code =
-                    ref.current.querySelector('code')?.innerText ?? '';
+                  const codeElement = ref.current.querySelector('code');
+                  const code = codeElement?.textContent ?? '';
                   copy(code).then((success) => {
                     if (success) {
                       Toast.success(t('代码已复制到剪贴板'));

web/src/helpers/api.js

@@ -118,7 +118,6 @@ export const buildApiPayload = (
     model: inputs.model,
     group: inputs.group,
     messages: processedMessages,
-    group: inputs.group,
     stream: inputs.stream,
   };
 
@@ -132,13 +131,15 @@ export const buildApiPayload = (
     seed: 'seed',
   };
 
+
   Object.entries(parameterMappings).forEach(([key, param]) => {
-    if (
-      parameterEnabled[key] &&
-      inputs[param] !== undefined &&
-      inputs[param] !== null
-    ) {
-      payload[param] = inputs[param];
+    const enabled = parameterEnabled[key];
+    const value = inputs[param];
+    const hasValue = value !== undefined && value !== null;
+
+
+    if (enabled && hasValue) {
+      payload[param] = value;
     }
   });
 

web/src/helpers/utils.jsx

@@ -75,13 +75,17 @@ export async function copy(text) {
     await navigator.clipboard.writeText(text);
   } catch (e) {
     try {
-      // 构建input 执行 复制命令
-      var _input = window.document.createElement('input');
-      _input.value = text;
-      window.document.body.appendChild(_input);
-      _input.select();
-      window.document.execCommand('Copy');
-      window.document.body.removeChild(_input);
+      // 构建 textarea 执行复制命令，保留多行文本格式
+      const textarea = window.document.createElement('textarea');
+      textarea.value = text;
+      textarea.setAttribute('readonly', '');
+      textarea.style.position = 'fixed';
+      textarea.style.left = '-9999px';
+      textarea.style.top = '-9999px';
+      window.document.body.appendChild(textarea);
+      textarea.select();
+      window.document.execCommand('copy');
+      window.document.body.removeChild(textarea);
     } catch (e) {
       okay = false;
       console.error(e);