Stateful API + Signal-bound modifiers demo.

Two complementary examples:

1. Stateful counter / event display — the original demo of stateful::<S>(), ctx.use_signal(), ctx.use_animated_value() (declarative spring animations + scoped signals).

2. Signal-bound modifiers (reactive-architecture-v2 Phase 2) — .bg(&state) / .opacity(&state) / .rounded(&state) / .border_color(&state) / .w(&state) patch a single RenderProps (or taffy Style) cell on state.set(...) without a Stateful wrap or closure re-run.

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