upgrade: tween package upgrade for Solid 2.0

[davedbase]

• isServerimport moved fromsolid-js/web→@solidjs/web`
• Replaced createEffect(on(target, handler, {defer: true})) with the Solid 2.0 two-argument createEffect(() => target(), handler, {defer: true}) — on() was removed in v2
• RAF cancellation now returned from the apply function instead of onCleanup (Solid 2.0 pattern)
• current() inside the apply callback wrapped in untrack() to suppress strict-mode warnings
• Test suite updated: flush() added after signal writes and RAF flushes to account for Solid 2.0's microtask batching
• Added test/server.test.ts (SSR safety verification)
• Peer deps bumped to solid-js@^2.0.0-beta.10 + `@solidjs/web@^2.0.0-beta.10

[changeset-bot]

🦋 Changeset detected

Latest commit: 098c39f

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/tween	Major

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