refactor(SearchBar): 替换 NutUI Input 为原生 input 元素

重构 SearchBar 组件，移除对 NutUI Input 组件的依赖，改用原生 input 元素实现搜索输入框。这提高了组件的渲染性能并减少了包体积。同时，自定义了搜索图标和清除按钮的样式与交互逻辑，以获得更精细的 UI 控制。

 <template>
   <view class="search-bar" :class="containerClass">
-    <!-- NutUI Input 组件 -->
-    <nut-input
-      v-model="internalValue"
-      :type="inputType"
-      :placeholder="placeholder"
-      :disabled="disabled"
-      confirm-type="search"
-      :clearable="showClear"
-      :border="false"
-      class="search-input"
-      @clear="handleClear"
-      @blur="handleBlur"
-      @focus="handleFocus"
-      @confirm="handleSearch"
-      style="background: transparent;"
-    >
-      <template #left>
+    <view class="search-input-wrapper">
+      <!-- 左侧搜索图标 -->
+      <IconFont
+        name="search"
+        :size="iconSize"
+        :color="iconColor"
+        class="search-icon"
+      />
+
+      <!-- 原生输入框 -->
+      <input
+        :value="internalValue"
+        :type="inputType"
+        :placeholder="placeholder"
+        :disabled="disabled"
+        confirm-type="search"
+        class="search-input"
+        @input="handleInput"
+        @focus="handleFocus"
+        @blur="handleBlur"
+        @confirm="handleSearch"
+      />
+
+      <!-- 清除按钮 -->
+      <view
+        v-if="showClear && internalValue"
+        class="clear-icon"
+        @tap="handleClear"
+      >
         <IconFont
-          name="search"
-          :size="iconSize"
-          :color="iconColor"
-          class="mr-[8rpx]"
+          name="close"
+          :size="14"
+          color="#9CA3AF"
         />
-      </template>
-    </nut-input>
+      </view>
+    </view>
   </view>
 </template>
 
@@ -230,26 +241,75 @@ function handleClear() {
   emit('clear')
   emit('update:modelValue', '')
 }
+
+/**
+ * 处理输入事件（原生 input）
+ */
+function handleInput(e) {
+  const value = e.detail.value
+  internalValue.value = value
+  emit('update:modelValue', value)
+  emit('input', value)
+}
 </script>
 
 <style lang="less">
 .search-bar {
   padding: 0;
-  background: white;
+  background: transparent;
   box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
   border-radius: 44rpx;
   border: 1px solid #e5e7eb;
 
-  :deep(.nut-input) {
+  .search-input-wrapper {
+    display: flex;
+    align-items: center;
     padding: 24rpx 32rpx;
-    background-color: transparent;
+    background: transparent;
+    border-radius: 44rpx;
+
+    .search-icon {
+      flex-shrink: 0;
+      margin-right: 16rpx;
+    }
+
+    .search-input {
+      flex: 1;
+      height: 100%;
+      font-size: 28rpx;
+      color: #333;
+      background: transparent;
+      border: none;
+      outline: none;
+      padding: 0;
+      margin: 0;
+
+      &::placeholder {
+        color: #9CA3AF;
+      }
+
+      &:disabled {
+        color: #ccc;
+      }
+    }
+
+    .clear-icon {
+      flex-shrink: 0;
+      margin-left: 16rpx;
+      padding: 8rpx;
+      cursor: pointer;
+
+      &:active {
+        opacity: 0.6;
+      }
+    }
   }
 
   &.search-bar-rounded {
     border-radius: 44rpx;
     overflow: hidden;
 
-    :deep(.nut-input) {
+    .search-input-wrapper {
       border-radius: 44rpx;
     }
   }
@@ -261,5 +321,9 @@ function handleClear() {
 
 .search-bar-rounded {
   height: 88rpx;
+
+  .search-input-wrapper {
+    height: 100%;
+  }
 }
 </style>