feat: 新增按钮组件，更新甘特图组件结构

src/components/A_NewComponents/Button/Button.vue

+<template>
+  <el-button
+    :type="props.type"
+    :class="[props.type, { disabled: props.disabled }]"
+    :disabled="props.disabled"
+  >
+    <slot></slot>
+  </el-button>
+</template>
+
+<script setup lang="ts">
+type ButtonType = 'primary' | 'warning' | 'info' | 'danger' | 'success'
+
+interface ButtonProps {
+  type?: ButtonType
+  disabled?: boolean
+}
+
+const props = withDefaults(defineProps<ButtonProps>(), {
+  type: 'primary',
+  disabled: false
+})
+</script>
+
+<style lang="scss" scoped>
+.el-button {
+  height: 36px;
+  min-width: 104px;
+  border: none;
+  background-color: transparent;
+  background-size: 100% 100%;
+  transition: filter 0.2s;
+
+  /* hover 变亮 */
+  &:hover {
+    filter: brightness(1.15);
+    background-color: transparent;
+  }
+
+  /* 按下变暗 */
+  &:active:not(.disabled) {
+    filter: brightness(0.95);
+    background-color: transparent;
+  }
+
+  /* 禁用状态 */
+  &.disabled {
+    filter: brightness(0.9);
+    cursor: not-allowed;
+  }
+
+  &.primary {
+    background-image: url('@/assets/imgs/button/primary_btn.png');
+  }
+
+  &.warning {
+    background-image: url('@/assets/imgs/button/warning_btn.png');
+  }
+
+  &.info {
+    background-image: url('@/assets/imgs/button/info_btn.png');
+  }
+
+  &.danger {
+    background-image: url('@/assets/imgs/button/danger_btn.png');
+  }
+
+  &.success {
+    background-image: url('@/assets/imgs/button/success_btn.png');
+  }
+}
+</style>

src/components/A_NewComponents/Gantt/index.ts

-import Gantt from './src/Gantt.vue'
-
-export { Gantt }
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