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/contracts/check-route-contract.mjs

@@ -0,0 +1,63 @@
+/* eslint-env node */
+import fs from 'node:fs'
+import path from 'node:path'
+import { fileURLToPath } from 'node:url'
+
+const currentDir = path.dirname(fileURLToPath(import.meta.url))
+const rootDir = path.resolve(currentDir, '../../../..')
+
+const files = {
+    page: path.resolve(rootDir, 'views/steady/checksquare/index.vue'),
+    staticRouter: path.resolve(rootDir, 'routers/modules/staticRouter.ts'),
+    dynamicRouter: path.resolve(rootDir, 'routers/modules/dynamicRouter.ts'),
+    authStore: path.resolve(rootDir, 'stores/modules/auth.ts')
+}
+
+const read = file => fs.readFileSync(file, 'utf8')
+const exists = file => fs.existsSync(file)
+
+const checks = [
+    ['checksquare page exists', () => exists(files.page)],
+    ['static router registers /checksquare/index', () => /path:\s*'\/checksquare\/index'/.test(read(files.staticRouter))],
+    ['static route name is checksquare', () => /name:\s*'checksquare'/.test(read(files.staticRouter))],
+    [
+        'static router imports checksquare page',
+        () => /@\/views\/steady\/checksquare\/index\.vue/.test(read(files.staticRouter))
+    ],
+    [
+        'static router aliases steady check-square to checksquare',
+        () => /\/steady\/check-square[\s\S]*\/steady\/checksquare/.test(read(files.staticRouter))
+    ],
+    [
+        'dynamic router aliases check-square to checksquare',
+        () => /\/steady\/check-square[\s\S]*\/steady\/checksquare/.test(read(files.dynamicRouter))
+    ],
+    [
+        'dynamic router keeps checksquare static route from being overwritten',
+        () => /STATIC_ROUTE_NAMES[\s\S]*'checksquare'/.test(read(files.dynamicRouter))
+    ],
+    [
+        'auth normalizes backend checksquare menu to static entry',
+        () => /isChecksquareMenu[\s\S]*menu\.path\s*=\s*'\/checksquare\/index'/.test(read(files.authStore))
+    ],
+    [
+        'auth treats 数据验证 menu title as checksquare',
+        () => /isChecksquareMenu[\s\S]*title\.includes\('数据验证'\)/.test(read(files.authStore))
+    ],
+    [
+        'business menu path resolver handles checksquare',
+        () => /isChecksquareMenu\(menu\)[\s\S]*return\s+'\/checksquare\/index'/.test(read(files.authStore))
+    ]
+]
+
+const failures = checks.filter(([, check]) => !check()).map(([name]) => name)
+
+if (failures.length) {
+    console.error('checksquare route contract failed:')
+    for (const failure of failures) {
+        console.error(`- ${failure}`)
+    }
+    process.exit(1)
+}
+
+console.log('checksquare route contract passed')