Fix sidepanel latestState bootstrap order

sidepanel/sidepanel.js

@@ -518,6 +518,7 @@ const SIGNUP_METHOD_EMAIL = 'email';
 const SIGNUP_METHOD_PHONE = 'phone';
 const DEFAULT_SIGNUP_METHOD = SIGNUP_METHOD_EMAIL;
 const DEFAULT_ACTIVE_FLOW_ID = 'openai';
+let latestState = null;
 let currentPlusModeEnabled = false;
 let currentPlusPaymentMethod = DEFAULT_PLUS_PAYMENT_METHOD;
 let currentSignupMethod = DEFAULT_SIGNUP_METHOD;
@@ -1123,7 +1124,6 @@ function validateCurrentRegistrationEmail(email = inputEmail.value.trim(), optio
   return false;
 }
 
-let latestState = null;
 let currentAutoRun = {
   autoRunning: false,
   phase: 'idle',

tests/sidepanel-plus-payment-method.test.js

@@ -116,6 +116,15 @@ test('sidepanel normalizeSignupMethod stays independent from signup constants du
   assert.doesNotMatch(source, /SIGNUP_METHOD_(PHONE|EMAIL)/);
 });
 
+test('sidepanel initializes latestState before bootstrapping shared step definitions', () => {
+  const latestStateIndex = sidepanelSource.indexOf('let latestState = null;');
+  const bootstrapIndex = sidepanelSource.indexOf('let stepDefinitions = getStepDefinitionsForMode(false, {');
+
+  assert.notEqual(latestStateIndex, -1);
+  assert.notEqual(bootstrapIndex, -1);
+  assert.ok(latestStateIndex < bootstrapIndex);
+});
+
 test('sidepanel signup method UI syncs shared step definitions with the selected signup method', () => {
   const source = extractFunction('updateSignupMethodUI');
   assert.match(source, /syncStepDefinitionsForMode\(/);