feat: implement Supabase authentication with Google OAuth

Add Supabase client, middleware, and auth pages; update header for auth state.

Co-authored-by: ASOwnerYT <[email protected]>

middleware.ts

@@ -0,0 +1,20 @@
+import { updateSession } from '@/lib/supabase/middleware'
+import { type NextRequest } from 'next/server'
+
+export async function middleware(request: NextRequest) {
+  return await updateSession(request)
+}
+
+export const config = {
+  matcher: [
+    /*
+     * Match all request paths except:
+     * - _next/static (static files)
+     * - _next/image (image optimization files)
+     * - favicon.ico (favicon file)
+     * - images - .svg, .png, .jpg, .jpeg, .gif, .webp
+     * Feel free to modify this pattern to include more paths.
+     */
+    '/((?!_next/static|_next/image|favicon.ico|.*\\.(?:svg|png|jpg|jpeg|gif|webp)$).*)',
+  ],
+}