Render presentations as slides in Learning Hub viewer

- New GET /api/learning/content/:slug/slides (authMiddleware only)
  Renders Marp markdown via marp-core, returns {css, slides[]} for
  any authenticated user — no moderator access required

- showViewer: when content_type === 'presentation', hides the body card
  and shows a presentation card with title, slide count, and View Slides button
  Auto-opens the slide modal immediately on load; button allows re-opening

- openSlidesFromSlug(): fetches slides from user-accessible endpoint
  then opens the existing slide preview modal (arrow keys, swipe, dots)

- Viewer already correctly hides feed/categories/search when viewing content;
  "Back to Feed" button returns to the main list

public/components/learning.html

@@ -20,6 +20,8 @@
         <!-- Content viewer (hidden until item clicked) -->
         <div id="lh-viewer" class="lh-viewer hidden">
           <button id="lh-back" class="btn-sm btn-ghost" style="margin-bottom:12px;"><i class="fas fa-arrow-left"></i> Back to Feed</button>
+          <!-- Presentation viewer — shown instead of body card for slide content -->
+          <div id="lh-presentation-viewer" class="hidden" style="margin-bottom:12px;"></div>
           <div class="card">
             <div class="card-header">
               <h3 id="lh-viewer-title"></h3>

public/js/learningHub.js

@@ -287,18 +287,54 @@
       if (item.created_at) parts.push(new Date(item.created_at).toLocaleDateString());
       metaEl.textContent = parts.join(' | ');
     }
-    if (bodyEl) {
-      // Render body as HTML (admin creates it); presentations store Marp markdown
-      bodyEl.innerHTML = sanitizeHtml(item.body || '');
-    }
+    var presViewer = document.getElementById('lh-presentation-viewer');
+    var bodyCard   = bodyEl ? bodyEl.closest('.card') : null;
 
-    // Quiz
-    if (quizSection) {
-      if (item.questions && item.questions.length > 0) {
-        quizSection.classList.remove('hidden');
-        renderQuiz(item.questions);
-      } else {
-        quizSection.classList.add('hidden');
+    if (item.content_type === 'presentation') {
+      // Hide body card, show presentation card with View Slides button
+      if (bodyCard) bodyCard.style.display = 'none';
+      if (presViewer) {
+        var slideCount = (item.body || '').split(/\n---\n/).length;
+        presViewer.className = '';  // remove hidden
+        presViewer.innerHTML =
+          '<div class="card" style="text-align:center;padding:32px 24px;">' +
+            '<div style="font-size:42px;margin-bottom:12px;">📊</div>' +
+            '<h3 style="margin:0 0 4px;color:var(--g800);">' + esc(item.title) + '</h3>' +
+            '<p style="font-size:13px;color:var(--g500);margin:0 0 20px;">' + slideCount + ' slides' + (item.subject ? ' · ' + esc(item.subject) : '') + '</p>' +
+            '<button id="btn-lh-view-slides" class="btn-primary" style="padding:11px 28px;font-size:14px;border-radius:10px;border:none;cursor:pointer;background:var(--blue);color:white;font-weight:600;">' +
+              '<i class="fas fa-play-circle"></i> View Slides' +
+            '</button>' +
+          '</div>';
+
+        // Auto-load and open slides
+        document.getElementById('btn-lh-view-slides').addEventListener('click', function() {
+          openSlidesFromSlug(item.slug);
+        });
+        // Open automatically on load
+        openSlidesFromSlug(item.slug);
+      }
+      // Quiz for presentations (optional)
+      if (quizSection) {
+        if (item.questions && item.questions.length > 0) {
+          quizSection.classList.remove('hidden');
+          renderQuiz(item.questions);
+        } else {
+          quizSection.classList.add('hidden');
+        }
+      }
+    } else {
+      // Normal content — show body card, hide presentation card
+      if (bodyCard) bodyCard.style.display = '';
+      if (presViewer) presViewer.className = 'hidden';
+      if (bodyEl) bodyEl.innerHTML = sanitizeHtml(item.body || '');
+
+      if (quizSection) {
+        if (item.questions && item.questions.length > 0) {
+          quizSection.classList.remove('hidden');
+          renderQuiz(item.questions);
+        } else {
+          quizSection.classList.add('hidden');
+        }
       }
     }
     if (resultsSection) resultsSection.classList.add('hidden');
@@ -1473,6 +1509,19 @@
   var _previewSlides = [];
   var _previewIdx = 0;
 
+  // Open slide modal for a published presentation in the user-facing viewer
+  function openSlidesFromSlug(slug) {
+    showLoading('Loading slides…');
+    fetch('/api/learning/content/' + encodeURIComponent(slug) + '/slides', { headers: getAuthHeaders() })
+      .then(function(r) { return r.json(); })
+      .then(function(data) {
+        hideLoading();
+        if (!data.success) { showToast(data.error || 'Could not load slides', 'error'); return; }
+        openSlideModal(data.slides, data.css);
+      })
+      .catch(function(err) { hideLoading(); showToast(err.message, 'error'); });
+  }
+
   function previewSlides() {
     var md = getMarpMarkdown();
     if (!md) { showToast('No slide content yet. Use AI Generate first.', 'info'); return; }

src/routes/learningHub.js

@@ -115,6 +115,32 @@ router.get('/content/:slug', async function(req, res) {
   } catch (err) { console.error('[LearningHub]', err.message); res.status(500).json({ error: 'Internal server error' }); }
 });
 
+// ============================================================
+// RENDER PRESENTATION SLIDES (user-accessible)
+// ============================================================
+router.get('/content/:slug/slides', async function(req, res) {
+  try {
+    var item = await db.get(
+      'SELECT body, content_type FROM learning_content WHERE slug = ? AND published = true',
+      [req.params.slug]
+    );
+    if (!item) return res.status(404).json({ error: 'Content not found' });
+    if (item.content_type !== 'presentation') return res.status(400).json({ error: 'Not a presentation' });
+
+    var { Marp } = require('@marp-team/marp-core');
+    var marp = new Marp({ html: false });
+    var { html, css } = marp.render(item.body || '');
+
+    var slides = [];
+    var sectionReg = /<section[^>]*>[\s\S]*?<\/section>/g;
+    var match;
+    while ((match = sectionReg.exec(html)) !== null) slides.push(match[0]);
+    if (slides.length === 0) slides.push(html);
+
+    res.json({ success: true, css: css, slides: slides });
+  } catch (err) { res.status(500).json({ error: err.message }); }
+});
+
 // ============================================================
 // SUBMIT QUIZ ANSWERS
 // ============================================================