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/steadyDataView/contracts/check-trend-contract.mjs

@@ -41,6 +41,7 @@ const expectations = [
     ['page does not import data table panel', /SteadyDataTablePanel/],
     ['components render floating indicator panel', /indicator-floating-panel/],
     ['page defaults floating indicator panel expanded', /indicatorPanelCollapsed\s*=\s*ref\(false\)/],
+    ['page restores default harmonic order when harmonic filter becomes visible', /DEFAULT_HARMONIC_ORDERS[\s\S]*showHarmonicOrders\.value[\s\S]*trendForm\.value\.harmonicOrders\.length[\s\S]*DEFAULT_HARMONIC_ORDERS/],
     ['API exposes ledger tree endpoint', /\/steady\/data-view\/ledger-tree/],
     ['API exposes indicator tree endpoint', /\/steady\/data-view\/indicator-tree/],
     ['API exposes trend query endpoint', /\/steady\/data-view\/trend\/query/],
@@ -55,16 +56,27 @@ const expectations = [
     ['components render indicator checkbox tree', /indicator-tree[\s\S]*show-checkbox[\s\S]*@check/],
     ['components reuse LineChart', /<LineChart/],
     ['toolbar uses shared time period search', /TimePeriodSearch/],
-    ['toolbar labels stat quality filters', /toolbar-field__label[\s\S]*统计：[\s\S]*toolbar-field__label[\s\S]*数据：/],
+    ['toolbar labels stat quality filters', /toolbar-field__label[\s\S]*统计：[\s\S]*toolbar-field__label[\s\S]*数据质量：/],
     ['toolbar does not render bucket selector', /modelValue\.bucket|bucketOptions|粒度：|选择时间粒度/],
     ['toolbar does not render phase selector', /modelValue\.phases|phaseOptions|resolvePhaseLabel/],
-    ['toolbar labels quality options descriptively', /仅有效数据[\s\S]*仅无效数据/],
-    ['toolbar binds valid quality flag to zero', /<el-option\s+label="仅有效数据"\s+:value="0"\s*\/>/],
+    ['toolbar renders quality flag with switch', /<el-switch[\s\S]*@update:model-value="handleQualityFlagChange"/],
+    ['toolbar maps valid quality flag to zero', /active-text="有效"[\s\S]*:active-value="0"/],
     ['utilities default to valid quality flag zero', /qualityFlag:\s*0/],
+    ['utilities default harmonic order to second harmonic', /DEFAULT_HARMONIC_ORDERS\s*=\s*\[2\]/],
     ['utilities collect selected line ids', /export const collectSelectedLineIds/],
     ['utilities validate selection limits', /export const validateTrendSelection[\s\S]*24/],
     ['utilities do not require phase selection', /if\s*\(!phases\.length\)/],
-    ['utilities validate harmonic orders', /export const validateHarmonicOrders[\s\S]*6/],
+    ['utilities cap harmonic order count at three', /MAX_HARMONIC_ORDER_COUNT\s*=\s*3/],
+    ['utilities validate harmonic orders', /export const validateHarmonicOrders[\s\S]*最多选择 \$\{MAX_HARMONIC_ORDER_COUNT\} 个/],
+    ['utilities count harmonic orders as one indicator in selection estimates', /const harmonicMultiplier\s*=\s*1/],
+    [
+        'toolbar does not provide harmonic quick groups',
+        /HARMONIC_ORDER_QUICK_GROUPS|harmonic-select__quick|appendHarmonicQuickOrders/
+    ],
+    [
+        'toolbar warns when harmonic selection exceeds three instead of using silent multiple-limit',
+        /(?=[\s\S]*MAX_HARMONIC_ORDER_COUNT)(?=[\s\S]*ElMessage\.warning\(`谐波次数最多选择 \$\{MAX_HARMONIC_ORDER_COUNT\} 个`\))(?![\s\S]*multiple-limit)/
+    ],
     ['utilities build trend query payload', /export const buildSteadyTrendQueryPayload/],
     ['utilities strip milliseconds from trend query time', /formatSteadyTrendQueryTime[\s\S]*replace\(\s*\/\\\.\[\^.\]\+\$\//],
     ['utilities do not send bucket in trend query payload', /bucket:\s*formState\.bucket/],
@@ -86,6 +98,7 @@ const sourceByExpectation = [
     pageSource,
     componentSource,
     pageSource,
+    pageSource,
     apiSource,
     apiSource,
     apiSource,
@@ -113,9 +126,14 @@ const sourceByExpectation = [
     utilitySource,
     utilitySource,
     utilitySource,
+    componentSource,
+    componentSource,
+    utilitySource,
+    utilitySource,
     utilitySource,
     interfaceSource,
     interfaceSource,
+    utilitySource,
     utilitySource
 ]