auth improvements:

- add google drive reauth support, if auth expires (for on-demand downloaded content)
- fix curated page width

src/pageutils.js

@@ -29,7 +29,18 @@ function getTS(iso) {
   return iso.replace(/[-:T]/g, '').slice(0, 14);
 }
 
+async function sourceToId(url) {
+  try {
+    url = new URL(url, window.location.origin).href;
+  } catch(e) {}
+
+  const digest = await digestMessage(url, 'SHA-256');
+  const coll = "id-" + digest.slice(0, 12);
+  return {url, coll};
+}
 
 
 
-export { digestMessage, tsToDate, getTS };
+
+
+export { digestMessage, tsToDate, getTS, sourceToId };