## Purpose

Define the collapsible sidebar drawer, its hamburger toggle, and the navigation menu with links to application pages.

## Requirements

### Requirement: Collapsible sidebar drawer

The application SHALL have a MudDrawer in MainLayout that contains a navigation menu. The drawer SHALL be toggleable via a hamburger icon button in the AppBar.

#### Scenario: Drawer visible on load

- **WHEN** the application loads
- **THEN** the sidebar drawer is displayed in its default open state with navigation links visible

#### Scenario: Drawer toggles on hamburger click

- **WHEN** the user clicks the hamburger icon in the AppBar
- **THEN** the drawer toggles between open and collapsed states

### Requirement: Navigation menu with Sales Assistant link

The sidebar drawer SHALL contain a MudNavMenu with a "Sales Assistant" navigation link that routes to `/sales-assistant`.

#### Scenario: Sales Assistant link present

- **WHEN** the drawer is open
- **THEN** a "Sales Assistant" link with a SmartToy icon is visible in the navigation menu

#### Scenario: Clicking Sales Assistant navigates to chat

- **WHEN** the user clicks the "Sales Assistant" link
- **THEN** the browser navigates to `/sales-assistant` and the chat page renders in MudMainContent

### Requirement: NavMenu is a separate component

The navigation menu SHALL be implemented as a separate `NavMenu.razor` component in the Layout folder, referenced from MainLayout.

#### Scenario: NavMenu renders inside drawer

- **WHEN** MainLayout renders
- **THEN** the NavMenu component renders inside the MudDrawer with its navigation links