Add FAQ guide and contextual help links

frontend/src/components/HelpLink.tsx

@@ -0,0 +1,19 @@
+import { CircleHelp } from "lucide-react";
+
+import { Button } from "@/components/ui/button";
+
+type HelpLinkProps = {
+  anchor: string;
+  label?: string;
+  className?: string;
+};
+
+export function HelpLink({ anchor, label = "Hilfe öffnen", className }: HelpLinkProps) {
+  return (
+    <Button asChild variant="ghost" size="icon-sm" className={className} title={label}>
+      <a href={`/faq#${anchor}`} aria-label={label}>
+        <CircleHelp className="size-4" />
+      </a>
+    </Button>
+  );
+}