fix(fs): fix `writeFile` and `writeTextFile` converting UTF-8 characters in path into replacement character

closes #1849

plugins/fs/guest-js/index.ts

@@ -1072,7 +1072,7 @@ async function writeTextFile(
 
   await invoke('plugin:fs|write_text_file', encoder.encode(data), {
     headers: {
-      path: path instanceof URL ? path.toString() : path,
+      path: encodeURIComponent(path instanceof URL ? path.toString() : path),
       options: JSON.stringify(options)
     }
   })