[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

packages/jupyter-ai/src/theme-provider.ts

@@ -1,7 +1,7 @@
 import { IThemeManager } from '@jupyterlab/apputils';
 import { Theme, createTheme } from '@mui/material/styles';
 
-let themeManager: IThemeManager | null = null; 
+let themeManager: IThemeManager | null = null;
 
 function getCSSVariable(name: string): string {
   return getComputedStyle(document.body).getPropertyValue(name).trim();