feat: switch auto run to per-round retry with resilient resume summary

- 合并 PR #47 的核心改动：自动运行按设定总轮数逐轮执行，单轮失败时按轮重试并输出汇总日志
- 本地补充修复：恢复轮次摘要持久化、修正重试等待期间 stop 收尾、fresh attempt 清理过期 tab/url 运行态
- 影响范围：background auto orchestration、sidepanel auto-run settings and status

sidepanel/sidepanel.html

@@ -198,15 +198,16 @@
         </div>
       </div>
       <div class="data-row">
-        <span class="data-label">兜底</span>
+        <span class="data-label">自动重试</span>
         <div class="data-inline fallback-inline">
-          <label class="toggle-switch" for="input-auto-skip-failures">
-            <input type="checkbox" id="input-auto-skip-failures" />
+          <label class="toggle-switch" for="input-auto-skip-failures" title="Auto retry restarts the current round from step 1 after a step failure.">
+            <input type="checkbox" id="input-auto-skip-failures" checked />
             <span class="toggle-switch-track" aria-hidden="true">
               <span class="toggle-switch-thumb"></span>
             </span>
           </label>
-          <div class="fallback-thread-interval">
+          <span class="auto-delay-caption">Retry the current round from step 1 after a short delay.</span>
+          <div class="fallback-thread-interval" style="display:none;">
             <span class="auto-delay-caption">线程间隔</span>
             <div class="auto-delay-controls">
               <input type="number" id="input-auto-skip-failures-thread-interval-minutes" class="data-input auto-delay-input" value="0"