fix: object-form query array serialization in next/link and next/router

[JaredStowell]

Fix object-form URL serialization so array query values are emitted as repeated params instead of comma-joined strings.

Before:

• { pathname: "/search", query: { tag: ["a", "b"], q: "x" } }
• serialized to /search?tag=a,b&q=x

After:

• serializes to /search?tag=a&tag=b&q=x

Changes

• add a shared query serializer that matches Next.js behavior for array values
• use that serializer in both next/link and next/router
• widen fixture next/link typings to allow array query values
• add regressions for Link rendering and router navigation

Testing

• pnpm test tests/link.test.ts
• pnpm test tests/shims.test.ts
• pnpm run fmt
• pnpm run typecheck

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commit: e9bead4

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