Migrating to GA4, swapping in Google Tag Manager, and renaming the site to steven.ocampo.io

Two things in one PR because they touched the same files: the analytics migration from Universal Analytics to GA4, and a site-wide rename from stevieismagic.com to steven.ocampo.io.

GA4 via GTM, loaded through next/script

Universal Analytics was being sunset by Google and my PR #1 wiring had me on the old gtag('config', UA-ID) path. Time to migrate.

Approach this time: instead of calling gtag directly, I load Google Tag Manager via Next.js's built-in next/script component with strategy="afterInteractive". GTM then owns the GA4 tag configuration on the GTM dashboard side, not in the codebase. Benefits:

• Swapping GA4 for something else later (Plausible, PostHog, Fathom) is a dashboard change, not a redeploy.
• next/script handles loading strategy properly — I don't need to hand-write <script async> tags or worry about placement.
• Tag config lives in one place (GTM), not split between pages/_document.js and a lib file.

<Script id="google-tag-manager" strategy="afterInteractive">
  {`
    (function(w,d,s,l,i){
      w[l]=w[l]||[];
      w[l].push({'gtm.start': new Date().getTime(), event:'gtm.js'});
      …
    })(window,document,'script','dataLayer','${process.env.NEXT_GOOGLE_TAG_MANAGER_ID}');
  `}
</Script>

Rename: stevieismagic.com → steven.ocampo.io

I've been shifting my personal identity online from the "Stevie IsMagic" brand (which is fine but juvenile for the kind of writing I want to do) to a plainer steven.ocampo.io. This PR does the rename in the places that matter for this blog:

• README.md — title updated to steven.ocampo.io.
• app/layout.tsx — site metadata, OG title, siteName, canonical URL, all OG image URLs.
• app/blog/[slug]/page.tsx — per-post OG image URL generation and per-post canonical URL.

Three spots for the OG image URL because the site has three different code paths that emit them (homepage OG, per-post OG, per-post fallback to an auto-generated OG at /api/og?title=…). Missed one of them in the initial sweep and had to come back.

Carryover: the layout still says "Stevie IsMagic" in one place

The sidebar <Logo> component still reads aria-label="Stevie IsMagic". I noticed it after the diff was open and decided to leave it for a later PR so this one stays focused on the analytics + metadata rename. PR #6 comes back for the sidebar.

Test plan

• Merge, let Vercel redeploy.
• Check network tab for GTM script loading.
• Check GA4 dashboard for incoming pageviews after a few minutes.
• Check canonical URLs in page source for a couple of posts.
• Check the OG image URLs by running the page through the Facebook Sharing Debugger.

There's one CSP wrinkle about to show up — adding GTM to the page triggers a Content-Security-Policy violation because googletagmanager.com isn't in the script-src allowlist. PR #4 fixes that (and PR #5 fixes a typo in the fix).

PR: https://github.com/StevieIsmagic/vercel_blog/pull/3