Add cross-site improvements across three phases

Phase 1 — Quick wins:
- Image lazy-loading on series/resource cards
- Newsletter signup added to Episodes page (before highlights)
- Per-route meta tags via usePageMeta hook (title, og:title, og:description)
- Breadcrumbs on study index, section, and notes pages
- SVG completion checkmark badges on study section list
- Analytics time-range filter (7d / 30d / 90d) in admin panel

Phase 2 — Medium features:
- Related episodes on archived series detail pages
- Resource library two-tier filter (type + tag chips)
- Global search (Fuse.js) moved below sticky header as full-width bar
- Q&A anonymous upvoting with localStorage dedup + admin pin/unpin
- Study enrollment funnel tracking (firstVisitAt, firstCompletionAt) with funnel chart in analytics

Phase 3 — Larger features:
- Study section comments (auto-approve for enrolled users, admin moderation panel)
- Study completion certificate (canvas render, PNG download, shareable public URL)
- Episode script full-text search (mammoth docx extraction, server-side search, admin upload UI)
- Reflection questions renamed from Discussion Questions; quiz answers can be shared to section discussion
- Public certificate route at /certificate/:token with og meta tags
- Comment moderation panel added to admin under Manage > Study Comments

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

server/routes/questions.js

@@ -12,7 +12,14 @@ function ensureDraftQuestions() {
 export function register(app) {
   app.get('/api/questions', (_req, res) => {
     const sourceQuestions = state.draftQuestions ?? state.questions
-    const publicQuestions = sourceQuestions.filter(q => q.isApproved === true && q.answer && q.answer.trim().length > 0)
+    const publicQuestions = sourceQuestions
+      .filter(q => q.isApproved === true && q.answer && q.answer.trim().length > 0)
+      .sort((a, b) => {
+        // Pinned questions always float to top
+        if (a.pinned && !b.pinned) return -1
+        if (!a.pinned && b.pinned) return 1
+        return 0
+      })
     res.json({ questions: publicQuestions })
   })
 
@@ -113,4 +120,41 @@ export function register(app) {
 
     res.json({ ok: true })
   })
+
+  // Anonymous upvote — no auth required, lightweight increment
+  app.post('/api/questions/:id/upvote', (req, res) => {
+    const { id } = req.params
+    // Look in live questions first, then draft
+    const liveQ = state.questions.find(q => q.id === id && q.isApproved === true)
+    const draftQ = state.draftQuestions ? state.draftQuestions.find(q => q.id === id) : null
+    const question = liveQ ?? draftQ
+    if (!question) {
+      res.status(404).json({ message: 'Question not found.' }); return
+    }
+    question.upvotes = ((question.upvotes ?? 0) + 1)
+    if (liveQ) queueQuestionsWrite()
+    if (draftQ) queueDraftQuestionsWrite()
+    res.json({ ok: true, upvotes: question.upvotes })
+  })
+
+  // Admin: pin / unpin a question
+  app.post('/api/admin-questions/:id/pin', requireAdminAuth, (req, res) => {
+    const { id } = req.params
+    ensureDraftQuestions()
+    const question = state.draftQuestions.find(q => q.id === id)
+    if (!question) { res.status(404).json({ message: 'Question not found.' }); return }
+    question.pinned = true
+    queueDraftQuestionsWrite()
+    res.json({ ok: true, question })
+  })
+
+  app.delete('/api/admin-questions/:id/pin', requireAdminAuth, (req, res) => {
+    const { id } = req.params
+    ensureDraftQuestions()
+    const question = state.draftQuestions.find(q => q.id === id)
+    if (!question) { res.status(404).json({ message: 'Question not found.' }); return }
+    question.pinned = false
+    queueDraftQuestionsWrite()
+    res.json({ ok: true, question })
+  })
 }