fix(state): 修复 Select 绑定时序（by AI）

CHANGELOG.md

@@ -1,5 +1,10 @@
 # CHANGELOG
 
+## v1.0.25 (2026-07-13)
+
+### 修复
+- **Select 双向绑定时序**: 延后绑定值回写，确保模板动态生成选项时保留状态中的目标值，而非被浏览器默认选项覆盖。
+
 ## v1.0.23 (2026-07-06)
 
 ### 修复

dist/state.js

@@ -451,7 +451,7 @@
         } else if (node.type === "radio") {
           if (node.checked !== (node.value === String(result ?? ""))) node.checked = node.value === String(result ?? "");
         } else if ("value" in node && node.type !== "file") {
-          Promise.resolve().then(() => {
+          setTimeout(() => {
             if (node.value !== String(result ?? "")) node.value = result;
           });
         } else if (node.isContentEditable) {

src/engine.js

@@ -280,7 +280,10 @@ export function _updateBinding(binding) {
 			} else if (node.type === 'radio') {
 				if (node.checked !== (node.value === String(result ?? ''))) node.checked = (node.value === String(result ?? ''));
 			} else if ('value' in node && node.type !== 'file') {
-				Promise.resolve().then(() => { if (node.value !== String(result ?? '')) node.value = result; });
+				// A select may receive its bound value before template-rendered
+				// options exist. Run after the current render turn so adding options
+				// cannot replace the model value with the browser's default option.
+				setTimeout(() => { if (node.value !== String(result ?? '')) node.value = result; });
 			} else if (node.isContentEditable) {
 				if (node.innerHTML !== String(result ?? '')) node.innerHTML = result;
 			}

test/dom.test.js

@@ -62,7 +62,16 @@ window.testDom = async function() {
     input.dispatchEvent(new Event('input'));
     if (state.val !== '') throw new Error('$bind must preserve an empty text value');
 
-    // 6. Double evaluation ($$ prefix)
+    // 6. A select bound before its template-rendered options must retain the
+    // model value instead of writing the browser-selected default back.
+    document.body.innerHTML = '<select id="test-select" $bind="state.selected"><template $each="state.options"><option $text="item" $value="item"></option></template></select>';
+    state.selected = 'second';
+    state.options = ['first', 'second'];
+    __unsafeRefreshState(document.documentElement);
+    await wait();
+    if ($('#test-select').value !== 'second' || state.selected !== 'second') throw new Error('$bind select must retain its value after rendering options');
+
+    // 7. Double evaluation ($$ prefix)
     console.log('Testing double evaluation ($$)...');
     document.body.innerHTML = `
         <div id="double-eval-root">