breaking(TNavBar): 收敛导航栏设计与公开契约 - #1082
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_getTitleStyle 中 fontSize 原先取 materialStyle?.fontSize ?? titleFont?.size， 在同时设置 Material AppBarTheme.titleTextStyle.fontSize 与显式 titleFont 时， Material 会反向覆盖构造器/Theme 的 titleFont，违背 spec 声明的 「构造器 > TNavBarThemeData > Material AppBarTheme > Token」优先级。 现按与 titleHeight 相同的 usesDesignDefaultFont 区分：仅当未显式设置 titleFont （回退默认 Token）时 Material 才插在 Token 之前；显式 titleFont 时由其 size 决定。 并补充两条回归测试。
NavBar 默认样式（返回图标 24、Title Large 默认字号/字重、默认高度 48）变化后， 导航组件组合矩阵 golden 中 NavBar 区域渲染随之改变，同步更新 navigation_components_light/dark.png 视觉基线，修复 visual regression。
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🤔 这个 PR 的性质是？
🔗 相关 Issue
关联 #1027 中“导航 / Navbar 导航栏”组件任务。
💡 需求背景和解决方案
现有 NavBar 默认返回、标题语义、内容高度和边框模式存在重复默认来源，公开 Demo 的组合与尺寸也未完全符合当前移动端设计。
useDefaultBack默认改为false，返回图标收敛为 24；标题默认使用 Title Large 语义 Token（18/26/600）。height收敛为非空实例参数并默认 48，继续作为PreferredSizeWidget.preferredSize和内容高度的唯一来源。useBorderStyle收敛为非空实例结构状态并从TNavBarThemeData移除；Theme 只保存可继承视觉值。87 × 24图片、标题对齐/尺寸与品牌色；公共 ExamplePage 显式保留既有返回和标题视觉，避免组件默认值污染其他 Demo。本地验证：组件 55 项与 Demo 3 项通过；生产覆盖率 174/178 = 97.75%；Flutter 3.32 Linux 的 Navbar 组件 2、Demo 2 及共享 ActionSheet 12 个严格 Golden 更新后无更新参数复跑通过并逐张核对；Flutter 3.32.0 / 3.47.0 的组件包与 Example analyze 零诊断，功能测试及 Web/Android 构建通过；Android 16 真机完成 uppercase Hot Restart、可见操作、integration 1/1、普通 APK 安装
Success与冷启动。📝 更新日志
breaking(TNavBar): 默认不再显示返回按钮，
height与useBorderStyle收敛为非空实例参数，并移除 Theme 中的边框结构状态入口breaking(TNavBar): 默认标题调整为 Title Large 语义样式，返回图标调整为 24
fix(TNavBar): 公开 Demo 补齐搜索、图片和标题样式组合，并隔离公共 Demo 页面壳视觉
本条 PR 不需要纳入 Changelog
☑️ 请求合并前的自查清单
type(<scope>?): 修改描述。示例：
fix(TBottomTabBar): 修复 iconText 模式底部溢出