feat(blog): add PostHog analytics events for blog pages

- Add analytics.ts with blog-specific tracking events:
  - trackBlogIndexView: Track blog index views with post count
  - trackBlogPostView: Track individual post views with metadata
  - trackBlogPostScrollDepth: Track reading progress (25%, 50%, 75%, 100%)
  - trackBlogPostTimeSpent: Track time spent on posts
  - trackBlogPostShare: Track social share clicks
  - trackBlogPostCTAClick: Track CTA engagement

- Add BlogIndexAnalytics and BlogPostAnalytics client components
- Integrate analytics into /blog and /blog/[slug] pages

Attribution is handled by PostHog save_referrer and save_campaign_params.

MKT-74

apps/web-roo-code/src/app/blog/[slug]/page.tsx

@@ -12,6 +12,7 @@ import {
 	getArticleStructuredData,
 	getBlogPostBreadcrumbStructuredData,
 } from "@/lib/blog"
+import { BlogPostAnalytics } from "@/components/blog/blog-analytics"
 
 // Force dynamic rendering to evaluate publish gating at request-time
 export const dynamic = "force-dynamic"
@@ -87,6 +88,17 @@ export default async function BlogPostPage({ params }: BlogPostPageProps) {
 			<script type="application/ld+json" dangerouslySetInnerHTML={{ __html: JSON.stringify(articleSchema) }} />
 			<script type="application/ld+json" dangerouslySetInnerHTML={{ __html: JSON.stringify(breadcrumbSchema) }} />
 
+			{/* PostHog Analytics */}
+			<BlogPostAnalytics
+				post={{
+					slug: post.slug,
+					title: post.title,
+					description: post.description,
+					tags: post.tags,
+					publish_date: post.publish_date,
+				}}
+			/>
+
 			<div className="container mx-auto px-4 py-12 sm:px-6 lg:px-8">
 				<article className="mx-auto max-w-3xl">
 					{/* Back link */}

apps/web-roo-code/src/app/blog/page.tsx

@@ -8,6 +8,7 @@ import {
 	getBlogCollectionStructuredData,
 	getBlogBreadcrumbStructuredData,
 } from "@/lib/blog"
+import { BlogIndexAnalytics } from "@/components/blog/blog-analytics"
 
 // Force dynamic rendering to evaluate publish gating at request-time
 export const dynamic = "force-dynamic"
@@ -65,6 +66,9 @@ export default function BlogIndex() {
 			<script type="application/ld+json" dangerouslySetInnerHTML={{ __html: JSON.stringify(collectionSchema) }} />
 			<script type="application/ld+json" dangerouslySetInnerHTML={{ __html: JSON.stringify(breadcrumbSchema) }} />
 
+			{/* PostHog Analytics */}
+			<BlogIndexAnalytics postCount={posts.length} />
+
 			<div className="container mx-auto px-4 py-12 sm:px-6 lg:px-8">
 				<div className="mx-auto max-w-4xl">
 					{/* Page Header */}

apps/web-roo-code/src/components/blog/blog-analytics.tsx

@@ -0,0 +1,99 @@
+"use client"
+
+import { useEffect, useRef } from "react"
+import type { BlogPost } from "@/lib/blog"
+import { trackBlogIndexView, trackBlogPostView, trackBlogPostScrollDepth, trackBlogPostTimeSpent } from "@/lib/blog"
+
+interface BlogIndexAnalyticsProps {
+	postCount: number
+}
+
+/**
+ * Client component that tracks blog index page view
+ * Place this inside the blog index page
+ */
+export function BlogIndexAnalytics({ postCount }: BlogIndexAnalyticsProps) {
+	const tracked = useRef(false)
+
+	useEffect(() => {
+		if (!tracked.current) {
+			trackBlogIndexView(postCount)
+			tracked.current = true
+		}
+	}, [postCount])
+
+	return null
+}
+
+interface BlogPostAnalyticsProps {
+	post: {
+		slug: string
+		title: string
+		description: string
+		tags: string[]
+		publish_date: string
+	}
+}
+
+/**
+ * Client component that tracks blog post view, scroll depth, and time spent
+ * Place this inside the blog post page
+ */
+export function BlogPostAnalytics({ post }: BlogPostAnalyticsProps) {
+	const trackedView = useRef(false)
+	const trackedDepths = useRef<Set<25 | 50 | 75 | 100>>(new Set())
+	const startTime = useRef<number>(Date.now())
+
+	useEffect(() => {
+		// Capture start time for cleanup function
+		const effectStartTime = startTime.current
+
+		// Track page view on mount
+		if (!trackedView.current) {
+			trackBlogPostView(post as BlogPost)
+			trackedView.current = true
+		}
+
+		// Track scroll depth
+		const handleScroll = () => {
+			const scrollHeight = document.documentElement.scrollHeight - window.innerHeight
+			if (scrollHeight <= 0) return
+
+			const scrollPercent = (window.scrollY / scrollHeight) * 100
+
+			const depths: (25 | 50 | 75 | 100)[] = [25, 50, 75, 100]
+			for (const depth of depths) {
+				if (scrollPercent >= depth && !trackedDepths.current.has(depth)) {
+					trackedDepths.current.add(depth)
+					trackBlogPostScrollDepth(post as BlogPost, depth)
+				}
+			}
+		}
+
+		// Track time spent on page when leaving
+		const handleVisibilityChange = () => {
+			if (document.visibilityState === "hidden") {
+				const timeSpent = Date.now() - effectStartTime
+				trackBlogPostTimeSpent(post as BlogPost, timeSpent)
+			}
+		}
+
+		window.addEventListener("scroll", handleScroll, { passive: true })
+		document.addEventListener("visibilitychange", handleVisibilityChange)
+
+		// Check initial scroll position
+		handleScroll()
+
+		return () => {
+			window.removeEventListener("scroll", handleScroll)
+			document.removeEventListener("visibilitychange", handleVisibilityChange)
+
+			// Track time spent when component unmounts
+			const timeSpent = Date.now() - effectStartTime
+			trackBlogPostTimeSpent(post as BlogPost, timeSpent)
+		}
+		// eslint-disable-next-line react-hooks/exhaustive-deps
+	}, [post.slug])
+
+	return null
+}

apps/web-roo-code/src/lib/blog/analytics.ts

@@ -0,0 +1,96 @@
+/**
+ * Blog Analytics Events
+ *
+ * PostHog tracking events for the blog section.
+ * These events help understand blog engagement and attribution.
+ */
+
+import posthog from "posthog-js"
+import type { BlogPost } from "./types"
+
+/**
+ * Track blog index page view
+ * Called when user views /blog
+ */
+export function trackBlogIndexView(postCount: number): void {
+	if (typeof window === "undefined" || !posthog.__loaded) return
+
+	posthog.capture("blog_index_viewed", {
+		post_count: postCount,
+		page_type: "blog_index",
+	})
+}
+
+/**
+ * Track blog post view
+ * Called when user views /blog/[slug]
+ */
+export function trackBlogPostView(post: BlogPost): void {
+	if (typeof window === "undefined" || !posthog.__loaded) return
+
+	posthog.capture("blog_post_viewed", {
+		post_slug: post.slug,
+		post_title: post.title,
+		post_tags: post.tags,
+		publish_date: post.publish_date,
+		page_type: "blog_post",
+	})
+}
+
+/**
+ * Track blog post scroll depth
+ * Called at various scroll thresholds (25%, 50%, 75%, 100%)
+ */
+export function trackBlogPostScrollDepth(post: BlogPost, depth: 25 | 50 | 75 | 100): void {
+	if (typeof window === "undefined" || !posthog.__loaded) return
+
+	posthog.capture("blog_post_scroll_depth", {
+		post_slug: post.slug,
+		post_title: post.title,
+		scroll_depth: depth,
+	})
+}
+
+/**
+ * Track blog post share
+ * Called when user clicks a share button
+ */
+export function trackBlogPostShare(post: BlogPost, platform: string): void {
+	if (typeof window === "undefined" || !posthog.__loaded) return
+
+	posthog.capture("blog_post_shared", {
+		post_slug: post.slug,
+		post_title: post.title,
+		share_platform: platform,
+	})
+}
+
+/**
+ * Track blog post CTA click
+ * Called when user clicks a CTA within a blog post
+ */
+export function trackBlogPostCTAClick(post: BlogPost, ctaType: string, ctaTarget: string): void {
+	if (typeof window === "undefined" || !posthog.__loaded) return
+
+	posthog.capture("blog_post_cta_click", {
+		post_slug: post.slug,
+		post_title: post.title,
+		cta_type: ctaType,
+		cta_target: ctaTarget,
+	})
+}
+
+/**
+ * Track time spent on blog post
+ * Called when user leaves the page (or at intervals)
+ */
+export function trackBlogPostTimeSpent(post: BlogPost, timeMs: number): void {
+	if (typeof window === "undefined" || !posthog.__loaded) return
+
+	posthog.capture("blog_post_time_spent", {
+		post_slug: post.slug,
+		post_title: post.title,
+		time_spent_ms: timeMs,
+		time_spent_seconds: Math.round(timeMs / 1000),
+	})
+}

apps/web-roo-code/src/lib/blog/index.ts

@@ -44,3 +44,13 @@ export {
 	getBlogPostBreadcrumbStructuredData,
 	getBlogPostUrl,
 } from "./structured-data"
+
+// Analytics (PostHog events)
+export {
+	trackBlogIndexView,
+	trackBlogPostView,
+	trackBlogPostScrollDepth,
+	trackBlogPostShare,
+	trackBlogPostCTAClick,
+	trackBlogPostTimeSpent,
+} from "./analytics"