harden oneliner session backend recovery

web/storyforge-web-v4/assets/app.js

@@ -562,6 +562,17 @@ function setLastSeenAt(value) {
   appState.lastSeenAt = SESSION_STORE.setLastSeenAt(value);
 }
 
+function normalizeBackendUrlValue(value) {
+  return String(value || "").trim().replace(/\/$/, "");
+}
+
+function hasSessionBackendMismatch(expectedBackendUrl = DEFAULT_BACKEND_URL) {
+  if (!appState.session) return false;
+  const expected = normalizeBackendUrlValue(expectedBackendUrl);
+  const current = normalizeBackendUrlValue(appState.session.backendUrl);
+  return Boolean(expected && current && expected !== current);
+}
+
 function compareDateDesc(leftValue, rightValue) {
   return new Date(rightValue || 0).getTime() - new Date(leftValue || 0).getTime();
 }
@@ -1139,6 +1150,10 @@ async function loginWithAutoSession(backendUrl = DEFAULT_BACKEND_URL) {
 async function ensureAutoSession(options = {}) {
   const backendUrl = options.backendUrl || readAuthForm().backendUrl || DEFAULT_BACKEND_URL;
   const force = Boolean(options.force);
+  const backendMismatch = hasSessionBackendMismatch(backendUrl);
+  if (backendMismatch) {
+    persistSession(null);
+  }
   if (appState.session && !force) {
     return true;
   }
@@ -1689,10 +1704,11 @@ async function loadPlatformAccount(platform, accountId, requestToken = 0) {
 
 async function bootstrap() {
   renderAll();
-  if (!appState.session) {
-    setBusy(true, "正在自动连接后端...");
+  const backendMismatch = hasSessionBackendMismatch();
+  if (!appState.session || backendMismatch) {
+    setBusy(true, backendMismatch ? "正在切换到当前工作区后端..." : "正在自动连接后端...");
     try {
-      await ensureAutoSession();
+      await ensureAutoSession({ force: backendMismatch });
     } finally {
       setBusy(false, "");
     }
@@ -8279,7 +8295,8 @@ document.addEventListener("submit", async (event) => {
       openOneLinerPanel();
       renderAll();
     } catch (error) {
-      alert("OneLiner 调度失败: " + error.message);
+      presentActionFailure(error, "OneLiner 调度失败");
+      openOneLinerPanel();
     } finally {
       setBusy(false, "");
     }

web/storyforge-web-v4/tests/workbench-pages.test.mjs

@@ -75,3 +75,21 @@ test("ensureAutoSession re-renders immediately when auto-connect starts", () =>
   assert.match(source, /appState\.autoConnectAttempted = true;/);
   assert.match(source, /renderAll\(\);/);
 });
+
+test("bootstrap does not trust a stored session from a different backend", () => {
+  const helpers = extractBetween(APP, "function loadStoredSession()", "function compareDateDesc(");
+  const ensure = extractBetween(APP, "async function ensureAutoSession(options = {})", "async function refreshFromAuthModal()");
+  const bootstrap = extractBetween(APP, "async function bootstrap()", "async function markTrackingDigestRead()");
+
+  assert.match(helpers, /function normalizeBackendUrlValue\(/);
+  assert.match(helpers, /function hasSessionBackendMismatch\(/);
+  assert.match(ensure, /const backendMismatch = hasSessionBackendMismatch\(backendUrl\);/);
+  assert.match(ensure, /persistSession\(null\);/);
+  assert.match(bootstrap, /const backendMismatch = hasSessionBackendMismatch\(\);/);
+  assert.match(bootstrap, /await ensureAutoSession\(\{ force: backendMismatch \}\);/);
+});
+
+test("oneliner submit failures stay inside the app instead of using a browser alert", () => {
+  assert.doesNotMatch(APP, /alert\("OneLiner 调度失败:/);
+  assert.match(APP, /presentActionFailure\(error,\s*"OneLiner 调度失败"\)/);
+});