refactor(ui): 整理主界面布局容器结构

[iamsyc]

Summary

• 下放权限引导页面的滚动容器职责，统一页面状态容器边界
• 合并 Virtual Displays 页面重复的列表布局实现
• 补齐列表卡片宽度约束，避免 Displays 页卡片收缩

Why

• 减少页面结构中的重复和特例容器
• 让只读卡片与可操作卡片共享一致的铺满列宽行为
• 为后续继续整理四个菜单页的布局结构打基础

Validation

• xcodebuild -project VoidDisplay.xcodeproj -scheme VoidDisplay -destination 'platform=macOS' build

[github-actions]

CI Summary

Run: Open

Check	Status	Details
Change Scope	code	code-relevant change set
Unit Tests	success	required
UI Smoke Tests (matrix: baseline + permissionDenied + rebuildFailed)	success	required; matrix: baseline + permissionDenied + rebuildFailed
Release Build Check (Release arch smoke: arm64 + x86_64)	success	required; Release arch smoke check (arm64 + x86_64 with thin/sign/verify)
CI Gate	success	required; driven by Unit Tests + UI Smoke Tests + Release Build Check

Gate rule: target main 的代码相关 PR 必须通过 Unit Tests + UI Smoke Tests + Release Build Check。