Add loading state with braille spinner to slide-show more button

www/js/version.json

@@ -1,5 +1,5 @@
 {
-  "VERSION": "v0.7.104",
-  "VERSION_NUMBER": "0.7.104",
-  "BUILD_DATE": "2026-08-17T10:13:32.771Z"
+  "VERSION": "v0.7.105",
+  "VERSION_NUMBER": "0.7.105",
+  "BUILD_DATE": "2026-08-17T10:28:11.271Z"
 }

www/slide-show.html

@@ -215,6 +215,33 @@
       filter: grayscale(var(--image-grayscale-hover));
     }
 
+    #btnSlideMore.is-loading {
+      cursor: progress;
+      opacity: 0.85;
+    }
+
+    .braille-spinner {
+      display: inline-block;
+      width: 1.1em;
+      text-align: left;
+      overflow: hidden;
+      vertical-align: middle;
+      white-space: nowrap;
+      font-family: monospace;
+      letter-spacing: 0;
+    }
+
+    .braille-spinner::after {
+      content: "⠋⠙⠹⠸⠼⠴⠦⠧⠇⠏";
+      display: inline-block;
+      animation: braille-spin 0.9s steps(10) infinite;
+    }
+
+    @keyframes braille-spin {
+      0%   { transform: translateX(0); }
+      100% { transform: translateX(-10em); }
+    }
+
 
     @media (max-width: 640px) {
       #divSlideGrid {
@@ -382,6 +409,7 @@ const versionInfo = await getVersion();
     let notesSubscription = null;
     let initialLoadSettled = false;
     let initialLoadTimer = null;
+    let renderDebounceTimer = null;
 
     const noteMap = new Map();
     let imagePosts = [];
@@ -601,7 +629,18 @@ const versionInfo = await getVersion();
         .sort((a, b) => (b.created_at || 0) - (a.created_at || 0));
     }
 
-    function setLoadingState(_isLoading) {}
+    function setLoadingState(isLoading) {
+      if (!btnSlideMore) return;
+      if (isLoading) {
+        btnSlideMore.classList.add('is-loading');
+        btnSlideMore.disabled = true;
+        btnSlideMore.innerHTML = '<span class="braille-spinner"></span> loading';
+      } else {
+        btnSlideMore.classList.remove('is-loading');
+        btnSlideMore.disabled = false;
+        updateMoreButton();
+      }
+    }
 
     function getVisibleImagePosts() {
       const visibleCount = Math.max(0, Math.min(visibleImageCount, imagePosts.length));
@@ -756,6 +795,19 @@ const versionInfo = await getVersion();
       updateMoreButton();
     }
 
+    // Debounce full re-renders triggered by live event updates so a burst of
+    // incoming events (e.g. the tail of a large subscription) doesn't clear and
+    // rebuild the grid on every single event, which causes scroll jank.
+    function scheduleGridRender() {
+      if (renderDebounceTimer) {
+        clearTimeout(renderDebounceTimer);
+      }
+      renderDebounceTimer = setTimeout(() => {
+        renderDebounceTimer = null;
+        renderGrid();
+      }, 250);
+    }
+
     function appendMoreTiles() {
       if (imagePosts.length === 0) return;
       divSlideEmpty.style.display = 'none';
@@ -998,14 +1050,20 @@ const versionInfo = await getVersion();
         const changed = upsertNoteIfImage(evt);
         if (changed) {
           rebuildImagePosts();
-          renderGrid();
-          setLoadingState(false);
-          if (initialLoadSettled) showLatestPublishedImageIfEnabled();
+          // During the initial load window we only accumulate events; the
+          // single render happens in settleInitialLoad() using the estimate.
+          // This avoids re-rendering (and re-laying-out) on every incoming
+          // event, which caused scroll jank and over-rendering.
+          if (initialLoadSettled) {
+            scheduleGridRender();
+            showLatestPublishedImageIfEnabled();
+          }
         }
       }
     }
 
     function startKind1Subscription() {
+      setLoadingState(true);
       notesSubscription = subscribe(
         {
           kinds: [1],
@@ -1031,6 +1089,7 @@ const versionInfo = await getVersion();
         return;
       }
 
+      setLoadingState(true);
       publicPool = new window.NostrTools.SimplePool();
       publicSub = publicPool.subscribeMany(
         PUBLIC_READ_RELAYS,
@@ -1040,8 +1099,12 @@ const versionInfo = await getVersion();
             const changed = upsertNoteIfImage(evt);
             if (changed) {
               rebuildImagePosts();
-              renderGrid();
-              if (initialLoadSettled) showLatestPublishedImageIfEnabled();
+              // Same as handleNdkEvent: only render after the initial load
+              // settles to avoid scroll jank and over-rendering.
+              if (initialLoadSettled) {
+                scheduleGridRender();
+                showLatestPublishedImageIfEnabled();
+              }
             }
           },
           oneose: () => {
@@ -1086,6 +1149,11 @@ const versionInfo = await getVersion();
         clearTimeout(initialLoadTimer);
         initialLoadTimer = null;
       }
+
+      if (renderDebounceTimer) {
+        clearTimeout(renderDebounceTimer);
+        renderDebounceTimer = null;
+      }
     }
 
     (async function main() {