Fix: Update Shiki import from getHighlighter to createHighlighter for v3.4.2 compatibility

- Shiki library API changed in version 3.4.2
- getHighlighter() function was deprecated and replaced with createHighlighter()
- Updated import statement and function call in DiffView.tsx
- Resolves build errors and maintains syntax highlighting functionality

app/components/workbench/DiffView.tsx

@@ -4,7 +4,7 @@ import { workbenchStore } from '~/lib/stores/workbench';
 import type { FileMap } from '~/lib/stores/files';
 import type { EditorDocument } from '~/components/editor/codemirror/CodeMirrorEditor';
 import { diffLines, type Change } from 'diff';
-import { getHighlighter } from 'shiki';
+import { createHighlighter } from 'shiki';
 import '~/styles/diff-view.css';
 import { diffFiles, extractRelativePath } from '~/utils/diff';
 import { ActionRunner } from '~/lib/runtime/action-runner';
@@ -555,7 +555,7 @@ const getSharedHighlighter = async () => {
     return highlighterPromise;
   }
 
-  highlighterPromise = getHighlighter({
+  highlighterPromise = createHighlighter({
     themes: ['github-dark', 'github-light'],
     langs: [
       'typescript',