fix(footnote): add overflow-wrap to footnote popup to prevent long words from overflowing (#3479)

The change adds overflow-wrap: break-word to the footnote popup body styles, which ensures long unbreakable strings (like URLs or long words) wrap properly instead of overflowing
the popup container.

apps/readest-app/src/utils/style.ts

@@ -473,6 +473,7 @@ export const getFootnoteStyles = () => `
 
   body {
     padding: 1em !important;
+    overflow-wrap: break-word;
   }
 
   a:any-link {