(chore): nextjs bundle analysis

[abvthecity]

Fixes FER-2854

Before this PR	After this PR

First-load JS savings: 114kb (-25%) (gzipped!)

The reduction of first-load JS to 329kb is just within the 350kb threshold.

---

Reasoning:

• _app.js was importing code from fern-api/fdr-sdk that it doesn't use, i.e. FdrClient.
• renderStylesheet imports code from radix and color.js, which did not need to be client-side. Shifted this over to getStaticProps.
• deleted datadog (deduplicate error logging from sentry)
• removed radix react-icons (which is not tree-shakeable) and react-feather, in favor of iconoir
• upgraded sonner to 1.5.0, which reduced its bundle footprint
  

---

Also in this PR: nextjs-bundle-analysis github action. Once merged, it will compare the bundle size against main.

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[linear]

FER-2854 Reduce initial JS bundle size