QA fixes: HEAD on page routes, Shorts signed-out 401, invite-page onboarding handoff, viewer check buttons clear of the overlay close button

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

public/assets/shorts.js

@@ -13,7 +13,9 @@
     st.token = null; st.maxSeen = 0; st.credited = false; st.done = false;
     $('shOver').hidden = true; $('shCta').hidden = true; $('shNext').hidden = true;
     let r = null;
-    try { r = await j('/api/my/videos?orientation=portrait'); } catch (e) {}
+    // signed-out visitors get the sign-in note without a 401 round trip
+    let me = null; try { me = await j('/api/me'); } catch (e) {}
+    if (me && me.signedIn && me.email) { try { r = await j('/api/my/videos?orientation=portrait'); } catch (e) {} }
     if (!r || r.error) { $('shVideo').hidden = true; $('shMsg').hidden = false; $('shMsg').textContent = 'Sign in on the dashboard to watch shorts and earn.'; return; }
     $('shStat').textContent = 'today: ' + (r.status.count || 0) + ' / ' + r.status.cap;
     if (!r.ad) {