fix(modal): blocklist offer persists until user acts or image changes

Drops the 8s auto-fade on the post-removal blocklist offer. User
complained it closed too fast to be useful. The offer is already
bounded by image switch (hideBlocklistOffer in updateImage) and
modal close (hideBlocklistOffer in closeModal), so time-based fade
was belt-and-suspenders. Keeps the 2.5s delay after a successful
blocklist so the confirmation text shows before hiding.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

app/static/js/view-modal.js

@@ -845,10 +845,10 @@ document.addEventListener('DOMContentLoaded', () => {
   }
 
   // After a pill removal, offer an inline "Blocklist this everywhere" button.
-  // Fades after 8s; click escalates to blocklist (same endpoint + Celery sweep
-  // as the suggestion chip's ⊘ button). Covers the case where you remove a
-  // WD14 composition descriptor (e.g. '1girl', 'breasts') from this image and
-  // realize you also don't want it anywhere else.
+  // Persists until the user dismisses it (×), escalates (⊘), or navigates
+  // away (image switch / modal close). No time-based auto-fade — the user's
+  // explicit attention is worth more than the small layout cost of keeping
+  // the bar visible.
   function showBlocklistOffer(name) {
     const offer = document.getElementById('blocklistOffer');
     if (!offer) return;
@@ -863,9 +863,6 @@ document.addEventListener('DOMContentLoaded', () => {
     offer.setAttribute('aria-hidden', 'false');
     btn.disabled = false;
 
-    clearTimeout(offer._fadeTimeout);
-    offer._fadeTimeout = setTimeout(() => hideBlocklistOffer(), 8000);
-
     btn.onclick = async () => {
       btn.disabled = true;
       try {
@@ -877,6 +874,7 @@ document.addEventListener('DOMContentLoaded', () => {
         const j = await r.json();
         if (j.ok) {
           label.textContent = `Blocklisted '${name}'. Cleanup task enqueued.`;
+          // Short delay so the user sees the confirmation before it closes.
           setTimeout(() => hideBlocklistOffer(), 2500);
         } else {
           label.textContent = `Couldn't blocklist: ${j.error || 'error'}`;
@@ -896,7 +894,6 @@ document.addEventListener('DOMContentLoaded', () => {
     if (!offer) return;
     offer.classList.remove('visible');
     offer.setAttribute('aria-hidden', 'true');
-    clearTimeout(offer._fadeTimeout);
   }
 
   // ---------------------------