feat: adapt raster media to dark theme

apps/web/src/styles/theme.css

@@ -51,6 +51,7 @@
   --tackle-teal: light-dark(#34777a, #78bec1);
   --tackle-violet: light-dark(#845787, #c795ca);
   --tackle-red: light-dark(#a95041, #ed8e7c);
+  --hero-image-filter: light-dark(saturate(.92) contrast(1.02), brightness(.78) saturate(.82) contrast(1.08));
 }
 
 :root[data-theme="light"] { color-scheme: light; }
@@ -173,8 +174,13 @@
   .admin-dashboard-grid > section, .admin-kpis > a, .admin-kpis > article,
   .source-health-grid article { background: var(--surface-elevated); border-color: var(--border-subtle); }
   .admin-history li small, .source-health-grid p, .health-state { color: var(--text-secondary); }
+  .lake-card { background: var(--surface-raised); box-shadow: 0 24px 70px var(--shadow-color); }
+  .lake-card img { filter: var(--hero-image-filter); }
+  .moderation-proof { border-radius: 11px; background: var(--surface-raised); }
+  .moderation-proof img { background: var(--surface-raised); }
 @media print {
   :root { color-scheme: light; }
+  .lake-card img { filter: none; }
 }
 
 @media (forced-colors: active) {