upgrade: virtual package upgrade for Solid 2.0

[davedbase]

• Bumps peer/dev dependencies to solid-js@2.0.0-beta.10 and @solidjs/web@2.0.0-beta.10
• createVirtualList now returns [Accessor<VirtualState>, onScroll] — the first element is reactive and must be called to read state
• VirtualList children signature updated to (item: Accessor<T>, index: Accessor<number>) matching Solid 2.0's <For> behavior
• Internal scroll offset signal uses { ownedWrite: true } to allow writes from the scroll event handler
• Adds a per-package vitest.config.ts using a custom Babel plugin with babel-preset-solid@2.0.0-experimental.16 to fix a JSX transform incompatibility (vite-plugin-solid@2.11.12 generates single-argument _$effect() calls which are incompatible with @solidjs/web's two-argument effect() requirement)
• Overrides jsxImportSource: "@solidjs/web" in tsconfig.json so TypeScript resolves JSX types from the correct package

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