feat(sidepanel): support configurable auto step delay

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

background.js

@@ -39,6 +39,10 @@ const DEFAULT_SUB2API_REDIRECT_URI = 'http://localhost:1455/auth/callback';
 const AUTO_RUN_ALARM_NAME = 'scheduled-auto-run';
 const AUTO_RUN_DELAY_MIN_MINUTES = 1;
 const AUTO_RUN_DELAY_MAX_MINUTES = 1440;
+const AUTO_STEP_RANDOM_DELAY_MIN_ALLOWED_SECONDS = 0;
+const AUTO_STEP_RANDOM_DELAY_MAX_ALLOWED_SECONDS = 600;
+const AUTO_STEP_RANDOM_DELAY_DEFAULT_MIN_SECONDS = 12;
+const AUTO_STEP_RANDOM_DELAY_DEFAULT_MAX_SECONDS = 18;
 const DEFAULT_LOCAL_CPA_STEP9_MODE = 'submit';
 
 initializeSessionStorageAccess();
@@ -60,6 +64,8 @@ const PERSISTED_SETTING_DEFAULTS = {
   autoRunSkipFailures: false, // 自动运行遇到失败步骤后，是否继续执行后续流程。
   autoRunDelayEnabled: false, // 自动运行是否启用启动前倒计时。
   autoRunDelayMinutes: 30, // 自动运行倒计时分钟数。
+  autoStepRandomDelayMinSeconds: AUTO_STEP_RANDOM_DELAY_DEFAULT_MIN_SECONDS, // 自动运行每一步执行前的最小随机等待秒数。
+  autoStepRandomDelayMaxSeconds: AUTO_STEP_RANDOM_DELAY_DEFAULT_MAX_SECONDS, // 自动运行每一步执行前的最大随机等待秒数。
   mailProvider: '163', // 验证码邮箱来源（163 / 163-vip / qq / inbucket）。
   emailGenerator: 'duck', // 注册邮箱生成方式：duck / cloudflare。
   inbucketHost: '', // 仅当 mailProvider 为 inbucket 时填写 Inbucket 地址，其他情况保持为空。
@@ -119,6 +125,32 @@ function normalizeAutoRunDelayMinutes(value) {
   );
 }
 
+function normalizeAutoStepRandomDelaySeconds(value, fallback = AUTO_STEP_RANDOM_DELAY_DEFAULT_MIN_SECONDS) {
+  const numeric = Number(value);
+  if (!Number.isFinite(numeric)) {
+    return fallback;
+  }
+  return Math.min(
+    AUTO_STEP_RANDOM_DELAY_MAX_ALLOWED_SECONDS,
+    Math.max(AUTO_STEP_RANDOM_DELAY_MIN_ALLOWED_SECONDS, Math.floor(numeric))
+  );
+}
+
+function normalizeAutoStepRandomDelayRange(settings = {}) {
+  const minSeconds = normalizeAutoStepRandomDelaySeconds(
+    settings.autoStepRandomDelayMinSeconds,
+    PERSISTED_SETTING_DEFAULTS.autoStepRandomDelayMinSeconds
+  );
+  const maxSeconds = Math.max(
+    minSeconds,
+    normalizeAutoStepRandomDelaySeconds(
+      settings.autoStepRandomDelayMaxSeconds,
+      PERSISTED_SETTING_DEFAULTS.autoStepRandomDelayMaxSeconds
+    )
+  );
+  return { minSeconds, maxSeconds };
+}
+
 function normalizeRunCount(value) {
   const numeric = Number(value);
   if (!Number.isFinite(numeric)) {
@@ -216,6 +248,16 @@ function normalizePersistentSettingValue(key, value) {
       return Boolean(value);
     case 'autoRunDelayMinutes':
       return normalizeAutoRunDelayMinutes(value);
+    case 'autoStepRandomDelayMinSeconds':
+      return normalizeAutoStepRandomDelaySeconds(
+        value,
+        PERSISTED_SETTING_DEFAULTS.autoStepRandomDelayMinSeconds
+      );
+    case 'autoStepRandomDelayMaxSeconds':
+      return normalizeAutoStepRandomDelaySeconds(
+        value,
+        PERSISTED_SETTING_DEFAULTS.autoStepRandomDelayMaxSeconds
+      );
     case 'mailProvider':
       return normalizeMailProvider(value);
     case 'emailGenerator':
@@ -264,6 +306,15 @@ function buildPersistentSettingsPayload(input = {}, options = {}) {
     payload.cloudflareDomains = domains;
   }
 
+  if (payload.autoStepRandomDelayMinSeconds !== undefined || payload.autoStepRandomDelayMaxSeconds !== undefined) {
+    const normalizedDelayRange = normalizeAutoStepRandomDelayRange({
+      autoStepRandomDelayMinSeconds: payload.autoStepRandomDelayMinSeconds,
+      autoStepRandomDelayMaxSeconds: payload.autoStepRandomDelayMaxSeconds,
+    });
+    payload.autoStepRandomDelayMinSeconds = normalizedDelayRange.minSeconds;
+    payload.autoStepRandomDelayMaxSeconds = normalizedDelayRange.maxSeconds;
+  }
+
   return payload;
 }
 
@@ -2422,6 +2473,12 @@ async function humanStepDelay(min = HUMAN_STEP_DELAY_MIN, max = HUMAN_STEP_DELAY
   await sleepWithStop(duration);
 }
 
+function getAutoStepRandomDelayMs(min, max) {
+  const normalizedMin = Math.max(0, Math.floor(Number(min) || 0));
+  const normalizedMax = Math.max(normalizedMin, Math.floor(Number(max) || normalizedMin));
+  return Math.floor(Math.random() * (normalizedMax - normalizedMin + 1)) + normalizedMin;
+}
+
 async function clickWithDebugger(tabId, rect) {
   throwIfStopped();
   if (!tabId) {
@@ -3028,6 +3085,19 @@ async function executeStep(step) {
 async function executeStepAndWait(step, delayAfter = 2000) {
   throwIfStopped();
 
+  const delaySettings = normalizeAutoStepRandomDelayRange(await getState());
+  const randomDelayMs = getAutoStepRandomDelayMs(
+    delaySettings.minSeconds * 1000,
+    delaySettings.maxSeconds * 1000
+  );
+  if (randomDelayMs > 0) {
+    await addLog(
+      `自动运行：步骤 ${step} 执行前随机等待 ${delaySettings.minSeconds}-${delaySettings.maxSeconds} 秒，本次约 ${Math.round(randomDelayMs / 1000)} 秒，避免节奏过快。`,
+      'info'
+    );
+    await sleepWithStop(randomDelayMs);
+  }
+
   if (AUTO_RUN_BACKGROUND_COMPLETED_STEPS.has(step)) {
     await addLog(`自动运行：步骤 ${step} 由后台流程负责收尾，执行函数返回后将直接进入下一步。`, 'info');
     await executeStep(step);
@@ -3376,6 +3446,8 @@ async function autoRunLoop(totalRuns, options = {}) {
         autoRunSkipFailures: prevState.autoRunSkipFailures,
         autoRunDelayEnabled: prevState.autoRunDelayEnabled,
         autoRunDelayMinutes: prevState.autoRunDelayMinutes,
+        autoStepRandomDelayMinSeconds: prevState.autoStepRandomDelayMinSeconds,
+        autoStepRandomDelayMaxSeconds: prevState.autoStepRandomDelayMaxSeconds,
         mailProvider: prevState.mailProvider,
         emailGenerator: prevState.emailGenerator,
         inbucketHost: prevState.inbucketHost,