feat(v4): add docker-compose and production-ready application

frontend/src/components/CanvasPane.jsx

@@ -28,7 +28,7 @@ export default function CanvasPane({ title, imageData, histogram, transform, onT
   }, [transform]);
 
   return (
-    <section className="flex min-h-0 flex-1 flex-col overflow-hidden border border-zinc-800 bg-zinc-950">
+    <section className="flex min-h-full flex-1 flex-col overflow-hidden border border-zinc-800 bg-zinc-950">
       <div className="flex items-center justify-between border-b border-zinc-800 px-4 py-3">
         <h2 className="text-sm font-semibold text-zinc-100">{title}</h2>
         <span className="text-xs tabular-nums text-zinc-400">{histogram ? "p(r_k) ready" : "No histogram"}</span>