Update next.js dependencies

[dividedmind]

This updates next.js dependencies in the test projects and removes the toplevel dependency (which was only used for types — these are now minimally declared).

[Copilot]

Pull request overview

This PR updates the Next.js versions used by the repository’s Next.js-based integration test workspaces and removes the root-level next dependency, replacing the previously-imported next/webpack types in the Next hook with minimal local type definitions.

Changes:

• Bump test/next to next@^14.2.35 and test/next16 to next@^16.1.7 (with corresponding yarn.lock updates).
• Remove the root devDependencies.next entry (it was only needed for type imports).
• Update the Next.js integration snapshot to match the new framework behavior/headers.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
yarn.lock	Updates locked Next.js-related packages and removes the root next entry’s lock impact.
package.json	Drops the root-level next devDependency.
test/next/package.json	Bumps the Next.js version used by the Next.js test workspace.
test/next16/package.json	Bumps the Next.js version used by the Next.js 16 test workspace.
test/snapshots/next.test.ts.snap	Updates snapshot expectations due to Next.js response/header changes.
src/hooks/next.ts	Replaces imported next/webpack types with minimal local types used by injectConfig.

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commit: ffd5597