fix: update min-height calculations for NotFound and Hero components (#70)

Author: BIA3IA

src/app/not-found.tsx

@@ -6,7 +6,7 @@ import { Button } from "@/components/ui/button"
 
 export default function NotFound() {
   return (
-    <main className="relative isolate flex min-h-[calc(100dvh-var(--header-height))] w-full items-center justify-center overflow-hidden">
+    <main className="relative isolate flex min-h-screen w-full items-center justify-center overflow-hidden">
       <section className="relative flex h-full w-full items-center justify-center">
         <div className="pointer-events-none absolute inset-0 flex items-center justify-center">
           <Image src={notFoundBackground} alt="" aria-hidden priority className="h-auto w-full max-w-4xl select-none" />

src/components/home/hero.tsx

@@ -5,7 +5,7 @@ import { Input } from "@/components/ui/input"
 export function Hero() {
   return (
     <main className="flex w-full justify-center px-4 sm:px-6">
-      <section className="flex min-h-[calc(100vh-var(--header-height))] w-full flex-col justify-between py-8 sm:py-12">
+      <section className="flex min-h-screen w-full flex-col justify-between py-8 sm:py-12">
         <div className="flex flex-1 flex-col items-center justify-center gap-10 text-center md:gap-16">
           <h1 className="typo-display-medium lg:typo-display-large max-w-5xl text-text-primary">
             Trova gruppi, risorse e supporto