Add /impressum and /datenschutz pages backed by Payload

- lib/payload.ts: getLegalPage(type) alongside the existing
  getBlogPosts/getProducts fetchers
- New RichText component: small dependency-free Lexical JSON → JSX
  renderer for Payload's richText fields (headings get stable
  "section-N" ids for anchor/TOC linking)
- New SectionTOC: generalized from VersandTOC into a reusable
  scroll-spy sidebar driven by any {id, title}[] — Datenschutz needs one
  built from CMS-authored headings, not a hardcoded array. VersandTOC is
  now a thin wrapper around it. Sticky positioning moved from the nav
  itself to each page's sidebar wrapper, so a TOC and an extra card
  (Impressum/Datenschutz both have one) scroll together as one unit
  instead of the card drifting away independently
- TOC clicks set the active item immediately and hold it for ~1s over
  the scroll-spy observer, covering both "target already fully visible,
  nothing to scroll" and "an unrelated section flickers through the
  intersection band mid-scroll"
- Both pages follow the same breadcrumb+H1+TOC-sidebar+content layout
  established for /versand

app/components/RichText.tsx

@@ -0,0 +1,146 @@
+import type { ReactNode } from "react";
+import type { TOCSection } from "./SectionTOC";
+
+// Minimal Lexical JSON → JSX renderer for Payload's richText fields.
+// Deliberately small and dependency-free (matches the project's existing
+// style — see Posts.ts's own hand-rolled extractPlainText on the Payload
+// side) rather than pulling in @payloadcms/richtext-lexical's full React
+// renderer just to walk a legal page's headings/paragraphs/lists. Covers
+// the node types real content actually uses; add more only when a page
+// genuinely needs them.
+
+type LexicalNode = {
+  type: string;
+  children?: LexicalNode[];
+  text?: string;
+  format?: number;
+  tag?: string;
+  listType?: "bullet" | "number";
+  fields?: { url?: string };
+};
+
+// Lexical's text format is a bitmask — see TextFormatType in the Lexical
+// source (IS_BOLD = 1, IS_ITALIC = 2, IS_UNDERLINE = 8).
+const BOLD = 1;
+const ITALIC = 2;
+const UNDERLINE = 8;
+
+function plainText(node: LexicalNode): string {
+  if (node.type === "text") return node.text ?? "";
+  return (node.children ?? []).map(plainText).join("");
+}
+
+// Numbered legal-page headings ("1. Verantwortlicher") get a stable
+// "section-1" id from the leading number — immune to copy edits changing
+// the heading text later, unlike a text-derived slug. Anything else
+// (headings with no leading number) falls back to a plain slugify.
+function headingId(text: string): string {
+  const numbered = text.match(/^(\d+)\./);
+  if (numbered) return `section-${numbered[1]}`;
+  return text
+    .toLowerCase()
+    .replace(/[^a-z0-9äöüß]+/g, "-")
+    .replace(/^-+|-+$/g, "");
+}
+
+// Walks the same tree the renderer does, collecting h2 headings for a
+// SectionTOC sidebar — kept in this file (not duplicated) so the ids it
+// produces can never drift from the ones the renderer actually assigns.
+export function extractHeadings(content: unknown): TOCSection[] {
+  const root = (content as { root?: LexicalNode })?.root;
+  if (!root?.children) return [];
+  const headings: TOCSection[] = [];
+  const walk = (nodes: LexicalNode[]) => {
+    for (const node of nodes) {
+      if (node.type === "heading" && (node.tag ?? "h2") === "h2") {
+        const text = plainText(node);
+        headings.push({ id: headingId(text), title: text });
+      }
+      if (node.children) walk(node.children);
+    }
+  };
+  walk(root.children);
+  return headings;
+}
+
+function renderChildren(nodes: LexicalNode[] | undefined, keyPrefix: string): ReactNode {
+  if (!nodes) return null;
+  return nodes.map((node, i) => renderNode(node, `${keyPrefix}-${i}`));
+}
+
+function renderNode(node: LexicalNode, key: string): ReactNode {
+  switch (node.type) {
+    case "linebreak":
+      return <br key={key} />;
+    case "text": {
+      let el: ReactNode = node.text;
+      const format = node.format ?? 0;
+      if (format & BOLD) el = <strong key={key}>{el}</strong>;
+      if (format & ITALIC) el = <em key={key}>{el}</em>;
+      if (format & UNDERLINE) el = <u key={key}>{el}</u>;
+      return <span key={key}>{el}</span>;
+    }
+    case "link":
+      return (
+        <a
+          key={key}
+          href={node.fields?.url ?? "#"}
+          className="text-brand hover:underline"
+        >
+          {renderChildren(node.children, key)}
+        </a>
+      );
+    case "heading": {
+      const Tag = (node.tag ?? "h2") as "h1" | "h2" | "h3" | "h4" | "h5" | "h6";
+      const text = plainText(node);
+      return (
+        <Tag
+          key={key}
+          id={Tag === "h2" ? headingId(text) : undefined}
+          className="font-semibold text-h-small text-text-primary mt-2 scroll-mt-32 first:mt-0"
+          style={{ fontFamily: "var(--font-lora)" }}
+        >
+          {renderChildren(node.children, key)}
+          <span className="block h-[0.125rem] w-8 bg-brand mt-2" aria-hidden />
+        </Tag>
+      );
+    }
+    case "list": {
+      const ListTag = node.listType === "number" ? "ol" : "ul";
+      return (
+        <ListTag
+          key={key}
+          className={
+            "flex flex-col gap-2 text-body text-text-body " +
+            (node.listType === "number" ? "list-decimal pl-5" : "list-disc pl-5")
+          }
+        >
+          {renderChildren(node.children, key)}
+        </ListTag>
+      );
+    }
+    case "listitem":
+      return (
+        <li key={key}>{renderChildren(node.children, key)}</li>
+      );
+    case "paragraph":
+      return (
+        <p key={key} className="text-body text-text-body">
+          {renderChildren(node.children, key)}
+        </p>
+      );
+    default:
+      return renderChildren(node.children, key);
+  }
+}
+
+export function RichText({ content }: { content: unknown }) {
+  const root = (content as { root?: LexicalNode })?.root;
+  if (!root?.children) return null;
+
+  return (
+    <div className="flex flex-col gap-4 w-full">
+      {renderChildren(root.children, "root")}
+    </div>
+  );
+}