upgrade: page-utilities packages migration and adaptation upgrade for Solid 2.0

[davedbase]

Migrates the former @solid-primitives/page-visibility package to Solid.js v2.0 (beta.13), adds two new navigation-blocking primitives, and renames the package to @solid-primitives/page-utilities to reflect its broader scope.

Solid 2.0 migration

• isServer import moved from solid-js/web → @solidjs/web
• INTERNAL_OPTIONS (ownedWrite: true) added to the internal signal — required because DOM event handlers firing within an owned scope trigger Solid 2.0's write guard
• flush() added in tests after dispatchEvent calls to commit pending signal values before asserting
• test/server.test.ts added to verify SSR behaviour
• Peer dependencies updated to solid-js@^2.0.0-beta.13 and @solidjs/web@^2.0.0-beta.13

New primitives: makePageLeave and createPageLeaveBlocker

makePageLeave is the base primitive — it attaches a beforeunload listener that calls e.preventDefault() to trigger the browser's built-in "Leave site?" dialog, and returns a cleanup function.

createPageLeaveBlocker is the reactive wrapper. It accepts an optional MaybeAccessor<boolean> (default true) so navigation blocking can be toggled reactively — the most practical pattern being gating on unsaved state:

const [isDirty, setIsDirty] = createSignal(false);
createPageLeaveBlocker(isDirty);

Static true/false wires up synchronously via onCleanup; a signal uses the Solid 2.0 split createEffect(compute, apply) pattern to arm and disarm the listener as the value changes.

Package rename

@solid-primitives/page-visibility → @solid-primitives/page-utilities. The package now covers page-level browser concerns beyond just visibility, and the name change reflects that.

Breaking changes

• Package renamed to @solid-primitives/page-utilities
• Peer dependencies now require solid-js@^2.0.0-beta.13 and `@solidjs/web@^2.0.0-beta.13

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