fix(gpc): keep auto mode when balance permission is unknown

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

@@ -502,6 +502,70 @@ return { updatePlusModeUI, selectGpcHelperPhoneMode, plusPaymentMethodCaption, r
   assert.match(api.plusPaymentMethodCaption.textContent, /自动/);
 });
 
+test('sidepanel start check keeps GPC auto mode when balance payload omits permission field', async () => {
+  const bundle = [
+    extractFunction('normalizeGpcAutoModePermissionValue'),
+    extractFunction('getGpcAutoModePermissionFromPayload'),
+    extractFunction('isGpcAutoModePermissionDenied'),
+    extractFunction('normalizeGpcRemainingUsesValue'),
+    extractFunction('ensureGpcApiKeyReadyForStart'),
+  ].join('\n');
+
+  const api = new Function(`
+let latestState = { gopayHelperPhoneMode: 'auto' };
+const GPC_HELPER_PHONE_MODE_AUTO = 'auto';
+const GPC_HELPER_PHONE_MODE_MANUAL = 'manual';
+const selectGpcHelperPhoneMode = { value: 'auto' };
+const dialogs = [];
+let saveCalls = 0;
+let updateCalls = 0;
+${bundle}
+function isGpcHelperCheckoutSelected() { return true; }
+function getSelectedGpcHelperPhoneMode() { return selectGpcHelperPhoneMode.value; }
+async function refreshGpcBalanceForStart() {
+  return {
+    gopayHelperRemainingUses: 998,
+    gopayHelperApiKeyStatus: 'active',
+    gopayHelperAutoModeEnabled: false,
+    gopayHelperBalancePayload: {
+      status: 'active',
+      remaining_uses: 998,
+    },
+  };
+}
+async function showGpcStartBlockedDialog(message) {
+  dialogs.push(message);
+}
+function syncLatestState(nextState) {
+  latestState = { ...latestState, ...nextState };
+}
+function updatePlusModeUI() {
+  updateCalls += 1;
+}
+async function saveSettings() {
+  saveCalls += 1;
+}
+function showToast() {}
+return {
+  ensureGpcApiKeyReadyForStart,
+  selectGpcHelperPhoneMode,
+  getDialogs: () => dialogs.slice(),
+  getSaveCalls: () => saveCalls,
+  getUpdateCalls: () => updateCalls,
+  getPersistedPhoneMode: () => latestState.gopayHelperPhoneMode,
+};
+`)();
+
+  const allowed = await api.ensureGpcApiKeyReadyForStart();
+
+  assert.equal(allowed, true);
+  assert.equal(api.selectGpcHelperPhoneMode.value, 'auto');
+  assert.equal(api.getPersistedPhoneMode(), 'auto');
+  assert.equal(api.getSaveCalls(), 0);
+  assert.equal(api.getUpdateCalls(), 0);
+  assert.deepEqual(api.getDialogs(), []);
+});
+
 test('sidepanel resolves pending GoPay manual confirmation from DATA_UPDATED state', async () => {
   const bundle = [
     extractFunction('openPlusManualConfirmationDialog'),