Repaint theme blue with larger typography

Swap the cherry-red primary for the logo's blue, bump body 13→15px
and h1 32→40px, and add semantic tokens (--bg-*, --accent-*, --text-*)
so future palette shifts are a single-file edit. Cherry-red survives
only for danger states and the brand cherry mark.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/lib/ui/components/StatusDot.svelte

@@ -5,7 +5,7 @@
         size?: number;
         label?: string | null;
     }
-    let { health, size = 8, label = null }: Props = $props();
+    let { health, size = 10, label = null }: Props = $props();
 </script>
 
 <span