first commit

frontend/components/ui/time-range-picker.tsx

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+"use client";
+
+import { cn } from "@/lib/utils";
+
+const OPTIONS = [
+  { label: "1h",  value: 1 },
+  { label: "6h",  value: 6 },
+  { label: "24h", value: 24 },
+  { label: "7d",  value: 168 },
+];
+
+interface TimeRangePickerProps {
+  value: number;
+  onChange: (hours: number) => void;
+  options?: { label: string; value: number }[];
+}
+
+export function TimeRangePicker({ value, onChange, options = OPTIONS }: TimeRangePickerProps) {
+  return (
+    <div className="flex items-center gap-0.5 rounded-md border border-border bg-muted/40 p-0.5">
+      {options.map((opt) => (
+        <button
+          key={opt.value}
+          onClick={() => onChange(opt.value)}
+          className={cn(
+            "px-2 py-0.5 text-[11px] font-medium rounded transition-colors",
+            value === opt.value
+              ? "bg-background text-foreground shadow-sm"
+              : "text-muted-foreground hover:text-foreground"
+          )}
+        >
+          {opt.label}
+        </button>
+      ))}
+    </div>
+  );
+}