Add budget tabs and sidebar budget indicators

ui/src/components/BudgetSidebarMarker.tsx

@@ -0,0 +1,13 @@
+import { DollarSign } from "lucide-react";
+
+export function BudgetSidebarMarker({ title = "Paused by budget" }: { title?: string }) {
+  return (
+    <span
+      title={title}
+      aria-label={title}
+      className="ml-auto inline-flex h-5 w-5 shrink-0 items-center justify-center rounded-full bg-red-500/90 text-white shadow-[0_0_0_1px_rgba(255,255,255,0.08)]"
+    >
+      <DollarSign className="h-3 w-3" />
+    </span>
+  );
+}