feat(prototype): 2D swarm data-plane visualization

Top-down SVG view: patrol flight with separation and obstacle avoidance,
mesh links appearing within radio range, pose-broadcast flashes, bulk
sync transfers with live rate and cumulative up/down counters, channel
hopping and battery per drone. Pure client-side simulation (Vite/React/TS).

prototype/src/main.tsx

@@ -0,0 +1,13 @@
+import { StrictMode } from "react";
+import { createRoot } from "react-dom/client";
+import App from "./App";
+
+const rootEl = document.getElementById("root");
+if (!rootEl) throw new Error("missing #root");
+
+document.body.style.margin = "0";
+createRoot(rootEl).render(
+  <StrictMode>
+    <App />
+  </StrictMode>,
+);