home3 news: typographic category cover for pictureless articles

~half the brief has no image, leaving a blank well above the headline. When an
article has no image_url, fill the well with the topic word (e.g. "science") in
lowercase Newsreader on a soft topic-tinted field, color-coded per topic
(science/tech/environment/health/community/culture/world/space + neutral
default). Same 5:4 footprint as the photo, so card height stays consistent.
Threads `topic` through the news object.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/routes/home3/+page.svelte

@@ -6,9 +6,24 @@
   // /home3 — the Claude Design "Frame A" direction (editorial, with colour), rebuilt in
   // our codebase with our real logo + self-hosted fonts, wired to live data. Hidden
   // prototype (noindex), alongside /home2 so we can compare.
-  let news = $state(null);   // {id, title, summary, image}
+  let news = $state(null);   // {id, title, summary, image, topic, ...}
   let art = $state(null);    // {title, artist, year, image}
   let newsFit = $state('cover');   // 'cover' = full-bleed photo; 'contain' = framed-plate figure
+
+  // Pictureless articles (~half the feed) get a typographic category cover instead of a blank
+  // well: the topic word on a soft topic-tinted field, color-coded across the feed.
+  const TOPIC_TINT = {
+    science:     { bg: '#e2edf1', ink: '#2f6d86' },
+    technology:  { bg: '#e8e9f4', ink: '#5a5fa0' },
+    environment: { bg: '#e6efe2', ink: '#3a7d5b' },
+    health:      { bg: '#f4e8e8', ink: '#a8566a' },
+    community:   { bg: '#f3ece0', ink: '#a9763f' },
+    culture:     { bg: '#ece5f3', ink: '#7e51b0' },
+    world:       { bg: '#e6ecf3', ink: '#4a6da0' },
+    space:       { bg: '#e7e7f2', ink: '#4a4e8a' },
+  };
+  const TOPIC_DEFAULT = { bg: '#e6edef', ink: '#3f6378' };
+  let topicTint = $derived(TOPIC_TINT[(news?.topic || '').toLowerCase()] || TOPIC_DEFAULT);
   let word = $state(null);   // /api/word/today
   let quote = $state(null);  // /api/quote/today
   let fact = $state(null);   // /api/onthisday/today
@@ -91,7 +106,7 @@
     } catch { /* global brief */ }
     try {
       const it = (await getJSON(`/api/brief?limit=1${homeq}`))?.items?.[0];
-      if (it) news = { id: it.id, title: it.title, summary: it.summary || it.description || '', image: it.image_url || null, source_read_minutes: it.source_read_minutes };
+      if (it) news = { id: it.id, title: it.title, summary: it.summary || it.description || '', image: it.image_url || null, topic: it.topic || null, source_read_minutes: it.source_read_minutes };
       // Photos display full (cover); only wide/tall figures (diagrams) get the framed plate.
       if (news?.image) {
         const probe = new Image();
@@ -159,9 +174,16 @@
     <!-- Good News (tall) — a card with TWO links, so it's a div, not a single anchor -->
     <div class="card news">
       <a class="news-photo-a" href={news?.id ? `/a/${news.id}` : '/'} aria-label="Read this article">
+        {#if news?.image}
           <div class="news-photo {newsFit}">
-          <div class="news-plate" style={news?.image ? `background-image:url(${news.image})` : ''}></div>
+            <div class="news-plate" style={`background-image:url(${news.image})`}></div>
           </div>
+        {:else}
+          <!-- pictureless: typographic category cover -->
+          <div class="news-typo" style={`background:${topicTint.bg}`}>
+            <span class="news-typo-word" style={`color:${topicTint.ink}`}>{news?.topic || 'good news'}</span>
+          </div>
+        {/if}
       </a>
       <div class="news-body">
         <span class="label" style="color:#0083ad">GOOD NEWS</span>
@@ -371,6 +393,13 @@
     box-shadow: 0 6px 18px -10px rgba(30, 60, 70, 0.28);
     background-size: contain; background-origin: content-box;
   }
+  /* pictureless fallback: topic word on a soft topic-tinted field, same footprint as the photo */
+  .news-typo { aspect-ratio: 5/4; display: flex; align-items: center; justify-content: center; padding: 16px; box-sizing: border-box; }
+  .news-typo-word {
+    font-family: 'Newsreader', Georgia, serif; font-weight: 500; font-size: clamp(1.9rem, 5vw, 2.9rem);
+    line-height: 1.05; letter-spacing: -0.01em; text-transform: lowercase; text-align: center; max-width: 100%;
+  }
+
   .news-body { padding: 24px 26px; flex: 1; display: flex; flex-direction: column; }
   .news h2 {
     font-size: clamp(1.55rem, 2.6vw, 30px); line-height: 1.14; margin: 12px 0 0;