fix(pull-btn): 运行态去掉绿色背景，边框不旋转，仅内部沙漏图标旋转

- 模板：pull-btn 内部图标移到 span，由 sync-spin 类控制旋转
- 样式：.pull-btn.on 恢复透明背景 + 无边框阴影，去掉整体旋转动画

frontend/src/views/SearchView.vue

@@ -418,7 +418,9 @@ const pendingCount = computed(() => state.pkgList.items.filter(i => i.status ===
               ? `正在按清单拉取… ${state.pkgPullProgress.processed}/${state.pkgPullProgress.total}（第 ${state.pkgPullProgress.round} 轮）`
               : '按 npm 包清单拉取（后台执行）'"
             @click.stop="doPkgPull"
-          >{{ state.pkgPullProgress.running ? '⏳' : '⬇️' }}</button>
+          >
+            <span :class="state.pkgPullProgress.running ? 'sync-spin' : ''">{{ state.pkgPullProgress.running ? '⏳' : '⬇️' }}</span>
+          </button>
           <span
             v-if="state.pkgPullProgress.failed > 0"
             class="fail-badge"
@@ -731,7 +733,7 @@ const pendingCount = computed(() => state.pkgList.items.filter(i => i.status ===
 }
 .pull-wrap { position: relative; }
 .pull-btn { font-size: 17px; }
-.pull-btn.on { animation: sync-spin 1.1s linear infinite; }
+.pull-btn.on { background: transparent; border-color: var(--line); box-shadow: none; }
 .fail-badge {
   position: absolute;
   top: -7px;