Improve readability and randomize guest landing pet.

Pair Share Tech Mono body text with Press Start 2P display accents, and show a randomized dressed pixel character for signed-out homepage previews.

components/layout/app-page-header.tsx

@@ -16,9 +16,9 @@ export function AppPageHeader({
           {eyebrow}
         </p>
       ) : null}
-      <h1 className="text-sm">{title}</h1>
+      <h1 className="text-base">{title}</h1>
       {description ? (
-        <p className="mt-2 text-xs leading-relaxed text-muted-foreground">
+        <p className="mt-2 text-sm leading-relaxed text-muted-foreground">
           {description}
         </p>
       ) : null}