feat: add Value.Equal bail-out check before reconciliation

Add TypeBox Value.Equal deep-comparison as first optimization layer
in reconcileProps. When a fiber's cached node is deep-equal to the
next node, skip prepareUpdate, commitUpdate, and children
reconciliation entirely. New cachedNode field on Fiber stores the
last reconciled node for comparison.

src/host/reconcile.ts

@@ -1,4 +1,5 @@
 import { effect } from "@preact/signals-core";
+import { Value } from "@alkdev/typebox/value";
 import type { Fiber, Effect } from "./fiber.js";
 import type { HostConfig } from "./config.js";
 import type { UNode, UElement } from "../core/schema.js";
@@ -59,6 +60,10 @@ export function reconcileProps<I>(
   host: HostConfig<string, I, unknown>,
   ctx: unknown,
 ): void {
+  if (fiber.cachedNode !== null && Value.Equal(fiber.cachedNode, nextNode)) {
+    return;
+  }
+
   if (isUPrimitive(nextNode)) {
     if (fiber.tag === "#text") {
       const text = nextNode === null ? "" : String(nextNode);
@@ -78,6 +83,7 @@ export function reconcileProps<I>(
         }
       }
     }
+    fiber.cachedNode = nextNode;
     return;
   }
 
@@ -87,6 +93,7 @@ export function reconcileProps<I>(
     for (let i = 0; i < count; i++) {
       reconcileProps(fiber.children[i]!, rootChildren[i]!, host, ctx);
     }
+    fiber.cachedNode = nextNode;
     return;
   }
 
@@ -96,6 +103,7 @@ export function reconcileProps<I>(
     const component = el.type as (props: Record<string, unknown>) => UNode;
     const out = component({ ...el.props, children: el.children });
     reconcileProps(fiber, out, host, ctx);
+    fiber.cachedNode = nextNode;
     return;
   }
 
@@ -120,6 +128,7 @@ export function reconcileProps<I>(
   for (let i = 0; i < count; i++) {
     reconcileProps(fiber.children[i]!, el.children[i]!, host, ctx);
   }
+  fiber.cachedNode = nextNode;
 }
 
 export function commitEffects<I>(