feat(steady): 实现台账指标树默认选中及图标展示功能

- 添加findFirstSelectableLedgerNode和findFirstLeafIndicator工具函数
- 实现台账树首次加载后默认选中第一个可查询监测点
- 实现指标树首次加载后默认选中第一个叶子指标
- 添加台账层级图标展示及样式配置
- 集成defaultCheckedKeys属性到台账和指标树组件
- 更新趋势查询参数移除bucket字段
- 修复数据质量标识默认值设置问题

frontend/src/views/steady/steadyDataView/utils/selectionRules.ts

@@ -38,6 +38,39 @@ export const collectLeafIndicators = (nodes: SteadyDataView.SteadyIndicatorNode[
     return indicators
 }
 
+export const findFirstSelectableLedgerNode = (
+    nodes: SteadyDataView.SteadyLedgerNode[]
+): SteadyDataView.SteadyLedgerNode | null => {
+    for (const node of nodes) {
+        if (node.level === 3 || node.selectable) {
+            return node
+        }
+
+        const childNode = findFirstSelectableLedgerNode(node.children || [])
+        if (childNode) return childNode
+    }
+
+    return null
+}
+
+export const findFirstLeafIndicator = (
+    nodes: SteadyDataView.SteadyIndicatorNode[]
+): SteadyDataView.SteadyIndicatorNode | null => {
+    for (const node of nodes) {
+        if (node.children?.length) {
+            const childNode = findFirstLeafIndicator(node.children)
+            if (childNode) return childNode
+            continue
+        }
+
+        if (node.indicatorCode) {
+            return node
+        }
+    }
+
+    return null
+}
+
 export const hasHarmonicIndicator = (indicators: SteadyDataView.SteadyIndicatorNode[]) => {
     return indicators.some(item => item.harmonic || Boolean(item.harmonicOrderStart || item.harmonicOrderEnd))
 }