feat: convert tmux monitoring into a plugin (B10)

plugins/tmux-monitor/src/frontend/TmuxMonitorApp.tsx

@@ -0,0 +1,16 @@
+import type { StandaloneViewProps } from "@termix/plugin-sdk/frontend";
+import { TmuxMonitor } from "./TmuxMonitor";
+
+/** `?view=tmux_monitor` full-screen links. */
+function TmuxMonitorApp({ hostId }: StandaloneViewProps) {
+  const parsed = hostId ? parseInt(hostId, 10) : NaN;
+  return (
+    <div className="h-screen w-screen overflow-hidden">
+      <TmuxMonitor
+        initialHostId={Number.isFinite(parsed) ? parsed : undefined}
+      />
+    </div>
+  );
+}
+
+export default TmuxMonitorApp;