feat: visual placeholders, type scale, CTAs and about image

Replace tiny JPEG stubs with per-slot Unsplash editorial placeholders,
align public type scale to DESIGN.md display/headline tokens, add
final-cta on all subpages, about_image_path on site settings, and harden
visual regression with solid-color VisualContentSeeder fixtures.

resources/views/components/home/manifesto.blade.php

@@ -12,7 +12,7 @@
     <div class="container-amare grid gap-8 md:grid-cols-[minmax(0,0.8fr)_minmax(0,1.2fr)]" data-reveal>
         <p class="text-sm font-medium uppercase tracking-[0.18em] text-amare-accent">Manifesto</p>
         <div class="space-y-6">
-            <h2 id="manifesto-heading" class="max-w-3xl text-3xl font-medium leading-tight text-amare-text md:text-4xl">{{ $title }}</h2>
+            <h2 id="manifesto-heading" class="max-w-3xl text-headline font-medium text-amare-text">{{ $title }}</h2>
             <p class="max-w-2xl text-xl leading-relaxed text-amare-text">{{ $lead }}</p>
             <p class="max-w-2xl text-amare-text-muted">{{ $body }}</p>
         </div>