Update Nextjs to 16.2.9

[marcoacierno]

What

Update Next.js to 16.2.9 and cleanup/remove some old deps

[vercel]

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Project	Deployment	Actions	Updated (UTC)
pycon	Ready	Preview	Jun 22, 2026 11:01am

[claude]

This PR upgrades Next.js to 16.2.9 and React to 19.2.7, swaps the cache handler library, and removes Vercel Analytics, dead dependencies, and the Jest test suite.

Critical: Middleware silently disabled

middleware.ts was renamed to proxy.ts and the exported function was renamed from middleware to proxy. Next.js only recognizes middleware.ts (or middleware.js) as middleware — any other filename is ignored. After this PR, locale detection and the auth redirect (e.g. /cfp, /grants, /voting) will silently stop enforcing, because the file with the config matcher will never be executed by the framework. A new middleware.ts that re-exports the proxy function (or simply keeping the original name) is needed.

Testing infrastructure removed with no replacement

jest.config.js, jest.global.setup.js, jest.setup.js, src/test-utils.tsx, all @testing-library/* devDependencies, and the pnpm test script are deleted. There is no indication a replacement test runner (e.g. Vitest) is being introduced. This leaves the frontend with zero test coverage and no runnable test command.

Node.js version requirement for new cache handler

@fortedigital/nextjs-cache-handler requires node >= 22.0.0. Confirm the Docker image and any CI/CD runners are pinned to Node 22+; if they are on 20 the cache handler initialization in instrumentation.ts will fail at startup.