docs: add wagmi v2 + viem v2 MiniPay integration example with hydration fix

[2TheMoom]

Adds a complete wagmi v2 + viem v2 integration example for MiniPay including:

• createConfig with Celo chain
• useMiniPay detection hook with auto-connect
• Hide connect button pattern
• React hydration error fix for Next.js 14 apps
• wagmi v1 → v2 migration table

Based on a working implementation built for Celo Proof of Ship June 2026.
Live demo: https://celosense.vercel.app

Built and tested by Abu Olumi

[GigaHierz]

Thanks for this! The wagmi v2 patterns here are genuinely useful, so I've incorporated them — with a few corrections — into the MiniPay quickstart instead, where the wallet setup naturally lives: #2195.

A couple of reasons for the different placement:

• The target page (code-library.mdx) is already viem v2 throughout, so it wasn't actually outdated. The stale wagmi v1 content was in quickstart.mdx, which docs: update MiniPay quickstart wagmi examples to v2 #2195 updates.
• The "hide connect button" / auto-connect material overlapped with what the quickstart already covered, so consolidating avoids two places teaching the same thing.

Fixes applied while folding it in: the connector now matches between createConfig and connect() (the original registered bare injected() but connected with injected({ target: "metaMask" })), the imports/chains source are consistent, and a couple of copy-paste leftovers were dropped.

Closing this in favor of #2195 — thanks again for the contribution!