upgrade: scheduled adapted to Solid-2.0

[davedbase]

• Bumped peer deps to solid-js@^2.0.0-beta.10; added @solidjs/web@^2.0.0-beta.10 as peer dep
• Replaced isServer import from solid-js/web → @solidjs/web
• Renamed getListener → getObserver (Solid 2.0 API rename)
• Added { ownedWrite: true } to createScheduled's internal signal — required when leading-edge schedules fire the invalidation callback synchronously from within an effect's compute phase
• Rewrote test/create-scheduled.test.ts: replaced createComputed (removed in 2.0) with two-arg createEffect + explicit flush() calls; discovered that writes to the internal signal from within a compute phase are deferred to the next flush (Solid 2.0 cycle prevention), so leading-edge schedules return true on the first flush and false on the second
• Updated README's createScheduled example to the two-arg createEffect pattern required by Solid 2.0

[changeset-bot]

🦋 Changeset detected

Latest commit: 334caad

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

This PR includes changesets to release 4 packages

Name	Type
@solid-primitives/scheduled	Major
@solid-primitives/memo	Patch
@solid-primitives/date	Patch
@solid-primitives/deep	Patch

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