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/checksquare/utils/checksquarePayload.ts

@@ -0,0 +1,69 @@
+import type { SteadyDataView } from '@/api/steady/steadyDataView/interface'
+import { buildTimePeriodRange, type TimePeriodUnit } from '@/views/components/TimePeriodSearch/timePeriod'
+
+export interface ChecksquareFormState {
+    timeRange: string[]
+    timeUnit: TimePeriodUnit
+    timeBaseDate: Date
+}
+
+export const defaultChecksquareFormState = (): ChecksquareFormState => {
+    const baseDate = new Date()
+
+    return {
+        timeRange: buildTimePeriodRange('day', baseDate),
+        timeUnit: 'day',
+        timeBaseDate: baseDate
+    }
+}
+
+const padTimeValue = (value: number) => `${value}`.padStart(2, '0')
+
+export const formatChecksquareTime = (date: Date) => {
+    return `${date.getFullYear()}-${padTimeValue(date.getMonth() + 1)}-${padTimeValue(date.getDate())} ${padTimeValue(
+        date.getHours()
+    )}:${padTimeValue(date.getMinutes())}:${padTimeValue(date.getSeconds())}`
+}
+
+export const collectChecksquareIndicatorCodes = (indicators: SteadyDataView.SteadyIndicatorNode[]) => {
+    return Array.from(new Set(indicators.map(item => item.indicatorCode).filter(Boolean))) as string[]
+}
+
+export const buildSteadyChecksquarePayload = (
+    lineId: string,
+    indicators: SteadyDataView.SteadyIndicatorNode[],
+    formState: ChecksquareFormState,
+    harmonicOrder?: number
+): SteadyDataView.SteadyChecksquareQueryParams => {
+    const payload: SteadyDataView.SteadyChecksquareQueryParams = {
+        lineId,
+        indicatorCodes: collectChecksquareIndicatorCodes(indicators),
+        timeStart: (formState.timeRange[0] || '').replace(/\.[^.]+$/, ''),
+        timeEnd: (formState.timeRange[1] || '').replace(/\.[^.]+$/, '')
+    }
+
+    if (harmonicOrder) {
+        payload.harmonicOrders = [harmonicOrder]
+    }
+
+    return payload
+}
+
+export const validateChecksquareSelection = (params: {
+    lineIds: string[]
+    indicators: SteadyDataView.SteadyIndicatorNode[]
+    timeRange: string[]
+}) => {
+    const { lineIds, indicators, timeRange } = params
+
+    if (!lineIds.length) return '请选择监测点'
+    if (lineIds.length > 1) return '数据校验一次只能选择一个监测点'
+    if (!indicators.length) return '请选择指标'
+    if (!timeRange[0]) return '请选择开始时间'
+    if (!timeRange[1]) return '请选择结束时间'
+    if (Date.parse(timeRange[0].replace(' ', 'T')) > Date.parse(timeRange[1].replace(' ', 'T'))) {
+        return '开始时间不能大于结束时间'
+    }
+
+    return ''
+}