upgrade: selection package upgrade for Solid 2.0

[davedbase]

src/index.ts`

• isServer import moved from solid-js/web → @solidjs/web
• INTERNAL_OPTIONS imported from @solid-primitives/utils and applied to both internal signals so setSelection can be called from reactive scopes
• The first createEffect (event listener setup with no reactive deps) was removed — listeners now register directly with onCleanup
• The second createEffect (DOM apply) converted to the Solid 2.0 split pattern: createEffect(compute, apply)

package.json

• solid-js bumped to 2.0.0-beta.10 (peer + dev)
• @solidjs/web: 2.0.0-beta.10 added (peer + dev)
• @solid-primitives/utils: workspace:^ added as a runtime dependency
• @babel/core and babel-preset-solid@2.0.0-beta.10 added as devDeps
• vitest script points to a local vitest.config.ts

vitest.config.ts (new)

• Custom config using babel-preset-solid with moduleName: "@solidjs/web", mirroring the virtual package's approach to work around the vite-plugin-solid / Solid 2.0 incompatibility

test/index.test.tsx

• render import from @solidjs/web; flush imported from solid-js
• All 6 tests rewritten: synchronous, inside createRoot, using dispatchEvent + flush() in place of the old await createEffect(async () => {...}) pattern

test/server.test.ts (new) — SSR no-op verification

.changeset/selection-solid2-migration.md — major bump changeset

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