feat: add landing page components including hero, features, problem, and footer

- Introduced LandingHero component with logo, tagline, and action buttons.
- Created LandingFeatures component to showcase chore system benefits.
- Developed LandingProblem component explaining the importance of a structured chore system.
- Implemented LandingFooter for navigation and copyright information.
- Added LandingPage to assemble all components and manage navigation.
- Included unit tests for LandingHero component to ensure functionality.

frontend/vue-app/src/common/api.ts

@@ -23,6 +23,7 @@ function handleUnauthorizedResponse(): void {
   logoutUser()
   if (typeof window === 'undefined') return
   if (window.location.pathname.startsWith('/auth')) return
+  if (window.location.pathname === '/') return
   if (unauthorizedRedirectHandler) {
     unauthorizedRedirectHandler()
     return