upgrade: cookies package upgrade for Solid 2.0

[davedbase]

Upgrades the cookies package to Solid 2.0 (beta.13), adds a full test suite, and clarifies the intended relationship between this package and @solid-primitives/storage.

Changes:

• isServer and getRequestEvent imported from @solidjs/web (was solid-js/web)
• createEffect converted to the required split compute/apply form — reactive tracking of the serialized value is now separated from the document.cookie write
• createSignal initial value cast to Exclude<T | undefined, Function> to satisfy Solid 2.0's strict overload that distinguishes value signals from derived writable signals
• Peer dependencies updated to solid-js@^2.0.0-beta.13 and @solidjs/web@^2.0.0-beta.13
• 19 browser tests and 6 SSR tests added covering all exported primitives
• package.json description and README updated to clarify scope

Architectural note — this package should use @solid-primitives/storage

@solid-primitives/cookies currently hand-rolls its own cookie read (parseCookie / getCookiesString) and write (document.cookie = ...) logic. The right foundation for this is cookieStorage from @solid-primitives/storage, which already provides a battle-tested, isomorphic localStorage-compatible cookie API with full attribute support (domain, path, secure, sameSite, httpOnly, expires, maxAge).

Once @solid-primitives/storage is migrated to Solid 2.0, this package should be updated to:

• Replace parseCookie / getCookiesString reads with cookieStorage.getItem()
• Replace the raw document.cookie = write in the effect with cookieStorage.setItem()
• Expand ServerCookieOptions to extend CookieOptions from storage, exposing the full attribute surface to callers

The blocker is that @solid-primitives/storage is currently still on solid-js@^1.6.12. Pulling it in now would create a version conflict. This PR intentionally defers the integration and documents it in the README so the dependency is tracked at the intent level until storage is ready.

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🦋 Changeset detected

Latest commit: 2ca051c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@solid-primitives/cookies	Major

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