add link with explanation to webpackMode eager

Author: kacper-mikolajczak

src/libs/fileDownload/heicConverter/index.ts

@@ -7,6 +7,7 @@ type HeicConverter = {
 
 const getHeicConverter = () => {
     // Use the CSP variant to ensure the library is loaded in a secure context. See https://github.com/hoppergee/heic-to?tab=readme-ov-file#cotent-security-policy
+    // Use webpackMode: "eager" to ensure the library is loaded immediately without evaluating the code. See https://github.com/Expensify/App/pull/68727#issuecomment-3227196372
     // @ts-expect-error - heic-to/csp is not correctly typed but exists
     return import(/* webpackMode: "eager" */ 'heic-to/csp').then(({heicTo, isHeic}: HeicConverter) => ({heicTo, isHeic}));
 };