docs(unit-3): Add code generation plan with open questions

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

aidlc-docs/features/cms-frontend/construction/plans/unit-3-code-generation-plan.md

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+# Code Generation Plan — Unit 3: Layout & Navigation
+
+**Status**: 📋 Awaiting answers
+
+## Unit Context
+
+**Unit**: Unit 3 — Layout & Navigation
+**Type**: Frontend (React/TypeScript with TanStack Router)
+**Depends on**: Unit 2 (AuthContext, useAuth, RoleGuard)
+**Stories Covered**: US-08, US-18, US-19
+
+**Key Deliverables**:
+- `AppLayout.tsx` — modified: remove Topbar, add MobileBar + SidebarOverlay
+- `Sidebar.tsx` — modified: role-filtered nav, sidebar footer with UserMenu + LanguageSwitcher + ThemeToggle
+- `MobileBar.tsx` — new: slim mobile bar with hamburger button
+- `SidebarOverlay.tsx` — new: slide-over wrapper for Sidebar on mobile
+- `ThemeToggle.tsx` — new: dark/light toggle button
+- `useTheme.ts` — new: theme state + localStorage sync
+- `Topbar.tsx` — deleted
+- `index.html` — modified: no-flash inline script
+- i18n — additions: `theme.*`, `nav.openMenu`
+- Unit tests for all new/modified components
+
+---
+
+Please answer the following questions by filling in the letter after each `[Answer]:` tag.
+
+## Question 1: Mobile sidebar animation
+When the slide-over sidebar opens on mobile, should it animate?
+
+A) Slide in from the left with a CSS transition (recommended — feels native, Tailwind `transition-transform`)
+B) Fade in (opacity transition only)
+C) No animation — appear/disappear instantly
+
+[Answer]:
+
+---
+
+## Question 2: Sidebar footer layout
+The sidebar footer contains UserMenu, LanguageSwitcher and ThemeToggle. How should these be presented?
+
+A) UserMenu shows avatar/name button + dropdown (as it does now in the Topbar) — LanguageSwitcher and ThemeToggle as icon buttons next to it (recommended — compact, consistent with current UserMenu)
+B) Flat list: name + email displayed as text, separate logout button, LanguageSwitcher and ThemeToggle as icon buttons below
+C) Collapsed by default — only icons visible, expands on click to show labels
+
+[Answer]:
+
+---
+
+## Question 3: Unit tests scope
+Which components should have unit tests?
+
+A) All new and modified components: AppLayout, Sidebar (role filtering), MobileBar, SidebarOverlay, ThemeToggle, useTheme (recommended)
+B) Only the role-filtering logic in Sidebar and the useTheme hook — skip layout wiring tests
+C) No new tests for this unit — layout is covered by existing RouteGuard tests
+
+[Answer]: