fix: correct metadata dates, remove draft note, remove duplicate section

- Fixed all 'undefined NaN, NaN' dates in metadata divs across all 22 posts
- Removed draft instruction from qr-code-scan-statistics-2026
- Removed duplicate 'Trackable / dynamic QR code' section from trackable-qr-codes
- All posts now have proper 'Last updated' dates showing January 26, 2026

src/app/(main)/(marketing)/learn/[pillar]/page.tsx

@@ -8,14 +8,20 @@ import { pillarPageSchema, faqPageSchema } from "@/lib/schema";
 import { FAQSection } from "@/components/aeo/FAQSection";
 import { AnswerBox } from "@/components/aeo/AnswerBox";
 
-export function generateMetadata({ params }: { params: { pillar: string } }) {
-    const meta = pillarMeta.find(p => p.key === params.pillar);
-    if (!meta) return {};
-    return {
-        title: `${meta.title} - Ultimate Guide | QR Master`,
-        description: meta.description
-    };
-}
+export function generateMetadata({ params }: { params: { pillar: string } }) {
+    const meta = pillarMeta.find(p => p.key === params.pillar);
+    if (!meta) return {};
+    return {
+        title: `${meta.title} - Ultimate Guide | QR Master`,
+        description: meta.description,
+        alternates: {
+            canonical: `https://www.qrmaster.net/learn/${meta.key}`,
+        },
+        openGraph: {
+            url: `https://www.qrmaster.net/learn/${meta.key}`,
+        },
+    };
+}
 
 export function generateStaticParams() {
     return pillarMeta.map((pillar) => ({

src/app/(main)/(marketing)/learn/page.tsx

@@ -2,10 +2,16 @@ import Link from "next/link";
 import { pillarMeta } from "@/lib/pillar-data";
 import { getPublishedPosts } from "@/lib/content";
 
-export const metadata = {
-    title: "Learn QR Code Mastery | QR Master Hub",
-    description: "Guides, use cases, tracking deep-dives, and security best practices for dynamic QR codes.",
-};
+export const metadata = {
+    title: "Learn QR Code Mastery | QR Master Hub",
+    description: "Guides, use cases, tracking deep-dives, and security best practices for dynamic QR codes.",
+    alternates: {
+        canonical: "https://www.qrmaster.net/learn",
+    },
+    openGraph: {
+        url: "https://www.qrmaster.net/learn",
+    },
+};
 
 export default function LearnHubPage() {
     const posts = getPublishedPosts();