Update PDF.js integration and dependencies (#4360)

Co-authored-by: ConnorYoh <[email protected]>
Co-authored-by: Reece Browne <[email protected]>

frontend/vitest.config.ts

@@ -1,5 +1,5 @@
 import { defineConfig } from 'vitest/config'
-import react from '@vitejs/plugin-react'
+import react from '@vitejs/plugin-react-swc';
 
 export default defineConfig({
   plugins: [react()],
@@ -37,4 +37,4 @@ export default defineConfig({
       '@': '/src'
     }
   }
-})
+})