chore: remove unused Codemirror dependencies and clean up imports

- Removed '@uiw/react-codemirror' from package.json and pnpm-lock.yaml as it is no longer needed.
- Cleaned up imports in useThemeExtension.ts to eliminate references to the removed dependency.
- Updated testUtils.tsx to use ChangeSpec from '@codemirror/state' instead of the removed '@uiw/react-codemirror'.

Author: tsck

packages/code-editor/package.json

@@ -60,7 +60,6 @@
     "@lezer/highlight": "^1.2.1",
     "@replit/codemirror-lang-csharp": "^6.2.0",
     "@uiw/codemirror-extensions-hyper-link": "^4.23.12",
-    "@uiw/react-codemirror": "^4.23.10",
     "@wasm-fmt/clang-format": "^20.1.7",
     "@wasm-fmt/gofmt": "^0.4.9",
     "@wasm-fmt/ruff_fmt": "^0.10.0",

packages/code-editor/src/CodeEditor/hooks/extensions/useThemeExtension.ts

@@ -1,4 +1,3 @@
-// import { EditorView } from '@uiw/react-codemirror';
 import { type EditorView } from '@codemirror/view';
 
 import { useDarkMode } from '@leafygreen-ui/leafygreen-provider';

packages/code-editor/src/testing/testUtils.tsx

@@ -1,7 +1,7 @@
 import React from 'react';
 import { indentUnit } from '@codemirror/language';
+import { type ChangeSpec } from '@codemirror/state';
 import { render, waitFor } from '@testing-library/react';
-import { ChangeSpec } from '@uiw/react-codemirror';
 
 import {
   CodeEditor,