upgrade: idle package upgrade for Solid 2.0

[davedbase]

src/createIdleTimer.ts`

• isServer import moved to @solidjs/web
• onMount → onSettled
• batch() calls removed (replaced with sequential signal writes)
• Both signals now use INTERNAL_OPTIONS (ownedWrite: true)
• Server return uses noop from utils

test/index.test.ts

• Added flush import from solid-js
• Added flush() after every signal-writing operation: after onSettled fires (via the existing call), after each vi.advanceTimersByTime() that triggers timer callbacks, after timer.start(), timer.reset(), timer.stop(), timer.triggerIdle(), and after DOM event dispatches that invoke handleEvent

test/server.test.ts — new SSR safety test

README.md — fixed default events list (removed stale "mousewheel", only "wheel" is in the actual defaults)

.changeset/idle-solid2-migration.md — major version bump changeset

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Latest commit: 431790f

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