feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

frontend/packages/common/prompt-kit/base/src/theme/default.ts

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2025 coze-dev Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+ 
+import { type Extension } from '@coze-common/editor-plugins/types';
+import { EditorView } from '@codemirror/view';
+
+export const defaultTheme: Extension = EditorView.theme({
+  '.cm-content': {
+    color: 'rgba(6, 7, 9, 0.80)',
+  },
+  '.cm-line': {
+    lineHeight: '24px',
+    paddingLeft: '12px',
+  },
+  '.cm-cursor': {
+    height: '20px !important',
+  },
+});