feat(compiler): commit deferred client state writes

packages/compiler/src/client-codegen.ts

@@ -268,6 +268,13 @@ function functionEntry(
         `if (!Object.is(${name}, __wrnexusInitialState[${JSON.stringify(name)}])) context.state.${name} = ${name};`,
     )
     .join("\n");
+  const commitBinding = stateNames.length
+    ? `const __wrnexusCommit = () => { ${copyBack} };
+    ${!parameterNames.has("commit") && !declaredLocals.has("commit") ? "const commit = __wrnexusCommit;" : ""}
+    ${!parameterNames.has("setTimeout") && !declaredLocals.has("setTimeout") ? `const setTimeout = (callback, delay, ...args) => globalThis.setTimeout(() => {
+      try { return callback(...args); } finally { __wrnexusCommit(); }
+    }, delay);` : ""}`
+    : "";
   const body = eraseFunctionTypes(fn.body);
   const runtimeBindings = [
     !parameterNames.has("output") ? "const output = context.output;" : "",
@@ -281,12 +288,13 @@ function functionEntry(
     ${initialStateSnapshot}
     ${stateAliases}
     ${propAliases}
+    ${commitBinding}
     ${peerAliases}
     ${runtimeBindings}
     try {
       ${body}
     } finally {
-      ${copyBack}
+      ${stateNames.length ? "__wrnexusCommit();" : ""}
     }
   }`;
 }