Create base layout

[replakcan]

Description

Create the base website layout shared by all pages.

Scope

• Create global layout structure
• Add header area
• Add footer area
• Add main content wrapper
• Apply basic responsive layout styles

Out of Scope

• Final visual design
• Dark mode
• Advanced animations
• Page-specific content

Acceptance Criteria

• Shared layout exists
• Header is visible
• Footer is visible
• Main content area is consistent
• Layout works on mobile and desktop
• npm run build succeeds

Technical Notes

• Keep layout simple for MVP.
• Avoid unnecessary UI libraries unless needed.

Related

• Depends on: Add basic project structure