feat: Centralize OG image font loading and sizing, simplify product page OG generation, and refine template styling.

lib/og-helper.tsx

@@ -0,0 +1,42 @@
+import { readFileSync } from 'fs';
+import { join } from 'path';
+
+/**
+ * Loads the Inter fonts for use in Satori (Next.js OG Image generation).
+ * Since we are using runtime = 'nodejs', we can read them from the filesystem.
+ */
+export async function getOgFonts() {
+    const boldFontPath = join(process.cwd(), 'public/fonts/Inter-Bold.ttf');
+    const regularFontPath = join(process.cwd(), 'public/fonts/Inter-Regular.ttf');
+
+    try {
+        const boldFont = readFileSync(boldFontPath);
+        const regularFont = readFileSync(regularFontPath);
+
+        return [
+            {
+                name: 'Inter',
+                data: boldFont,
+                weight: 700 as const,
+                style: 'normal' as const,
+            },
+            {
+                name: 'Inter',
+                data: regularFont,
+                weight: 400 as const,
+                style: 'normal' as const,
+            },
+        ];
+    } catch (error) {
+        console.error('Failed to load OG fonts from filesystem, falling back to system fonts:', error);
+        return [];
+    }
+}
+
+/**
+ * Common configuration for OG images
+ */
+export const OG_IMAGE_SIZE = {
+    width: 1200,
+    height: 630,
+};