feat(steady): 完善稳态数据视图功能

- 更新纵坐标刻度算法，优化小数趋势图范围显示
- 添加稳态趋势图全屏模式和共享工具组件
- 实现多图联动的鼠标悬停竖线同步功能
- 调整主线线宽分档策略，降低最大线宽限制
- 重构稳态趋势工具栏，优化谐波次数选择逻辑
- 添加周时间周期搜索支持和自定义时间范围选择
- 完善稳态数据表格和指示器浮动面板功能
- 优化稳态趋势图性能，添加LTB采样和动画控制
- 修复数据表格打开前的趋势数据验证问题
- 统一时间轴标签格式化和网格对齐处理

frontend/src/views/steady/steadyTrend/components/SteadyTrendChartTools.vue

@@ -0,0 +1,61 @@
+<template>
+    <div class="trend-tool-groups">
+        <div v-for="group in toolGroups" :key="group.key" class="trend-tool-group">
+            <el-tooltip v-for="item in group.items" :key="item.action" :content="getToolTooltip(item)" placement="top">
+                <el-button
+                    :type="isToolActive(item.action) ? 'primary' : 'default'"
+                    :icon="item.icon"
+                    :disabled="isToolDisabled(item.action)"
+                    circle
+                    @click="emit('tool-action', item.action)"
+                />
+            </el-tooltip>
+        </div>
+    </div>
+</template>
+
+<script setup lang="ts">
+import type { SteadyTrendToolAction, SteadyTrendToolGroup, SteadyTrendToolItem } from './chartTools'
+
+defineOptions({
+    name: 'SteadyTrendChartTools'
+})
+
+defineProps<{
+    toolGroups: SteadyTrendToolGroup[]
+    isToolActive: (action: SteadyTrendToolAction) => boolean
+    isToolDisabled: (action: SteadyTrendToolAction) => boolean
+    getToolTooltip: (item: SteadyTrendToolItem) => string
+}>()
+
+const emit = defineEmits<{
+    'tool-action': [action: SteadyTrendToolAction]
+}>()
+</script>
+
+<style scoped lang="scss">
+.trend-tool-groups {
+    display: flex;
+    align-items: center;
+    justify-content: flex-end;
+    gap: 8px;
+    min-width: 0;
+}
+
+.trend-tool-group {
+    display: flex;
+    align-items: center;
+    gap: 4px;
+}
+
+.trend-tool-group + .trend-tool-group {
+    padding-left: 8px;
+    border-left: 1px dashed var(--el-border-color);
+}
+
+.trend-tool-group :deep(.el-button.is-circle) {
+    width: 28px;
+    height: 28px;
+    padding: 6px;
+}
+</style>