Add print cover fields and office profile

- Project settings gain siteAddress, workStage, projectLead and
  projectEditor (project.update-settings schema version 3, migration 0009);
  versions 2 and 1 stay executable and keep the current cover values.
  Snapshot schema 6 carries the fields; older versions upgrade with null.
- Global office profile (office name/address) next to the document logo:
  table document_branding_settings, PUT /api/document-branding/office,
  editable from the print view toolbar.
- Cover page reads all fields; empty values show the "[ergänzen]" marker.
  The Planstände editor column shows the project editor.
- Shared logo constants moved to a dependency-free module so the Next.js
  bundler can import them.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/app/projects/[projectId]/print/page.tsx

@@ -2,7 +2,7 @@
 
 import Link from "next/link";
 import { useParams } from "next/navigation";
-import { ChangeEvent, useEffect, useMemo, useState } from "react";
+import { ChangeEvent, FormEvent, useEffect, useMemo, useState } from "react";
 import "../../../../frontend/print/print-document.css";
 import {
   deleteDocumentLogo,
@@ -14,13 +14,20 @@ import {
   listDistributionBoards,
   listFloors,
   listProjectSnapshots,
+  updateOfficeProfile,
   uploadDocumentLogo,
 } from "../../../../frontend/utils/api";
 import type {
   DocumentLogoMetadataDto,
+  OfficeProfileDto,
   ProjectDto,
   ProjectSnapshotMetadataDto,
 } from "../../../../frontend/types";
+import { FormModal } from "../../../../frontend/components/form-modal";
+import {
+  officeProfileFieldLabels,
+  officeProfileFieldMaxLengths,
+} from "../../../../shared/constants/project-cover";
 import { PrintDocument } from "../../../../frontend/print/print-document";
 import {
   buildPreliminaryBoardHierarchy,
@@ -30,7 +37,7 @@ import {
 import {
   documentLogoMimeTypes,
   maxDocumentLogoBytes,
-} from "../../../../shared/validation/document-branding.schemas";
+} from "../../../../shared/constants/document-branding";
 
 type PlanFormat = "a4" | "a3";
 
@@ -61,6 +68,14 @@ export default function ProjectPrintPage() {
   const projectId = params.projectId;
   const [data, setData] = useState<PrintData | null>(null);
   const [logo, setLogo] = useState<DocumentLogoMetadataDto | null>(null);
+  const [office, setOffice] = useState<OfficeProfileDto>({
+    officeName: null,
+    officeAddress: null,
+  });
+  const [officeDraft, setOfficeDraft] = useState<{
+    officeName: string;
+    officeAddress: string;
+  } | null>(null);
   const [format, setFormat] = useState<PlanFormat>("a4");
   const [error, setError] = useState<string | null>(null);
   const [message, setMessage] = useState<string | null>(null);
@@ -116,6 +131,7 @@ export default function ProjectPrintPage() {
           .sort((left, right) => left.createdAtIso.localeCompare(right.createdAtIso)),
       });
       setLogo(branding.logo);
+      setOffice(branding.office);
       document.title = `Leistungsbilanz – ${project.name}`;
     }
     load().catch((err: unknown) => {
@@ -172,6 +188,28 @@ export default function ProjectPrintPage() {
     }
   }
 
+  async function handleOfficeSave(event: FormEvent<HTMLFormElement>) {
+    event.preventDefault();
+    if (!officeDraft) {
+      return;
+    }
+    setIsBusy(true);
+    setError(null);
+    try {
+      const result = await updateOfficeProfile({
+        officeName: officeDraft.officeName.trim() || null,
+        officeAddress: officeDraft.officeAddress.trim() || null,
+      });
+      setOffice(result.office);
+      setOfficeDraft(null);
+      setMessage("Büroangaben gespeichert. Sie gelten für alle Projekte.");
+    } catch (err) {
+      setError(err instanceof Error ? err.message : "Die Büroangaben konnten nicht gespeichert werden.");
+    } finally {
+      setIsBusy(false);
+    }
+  }
+
   async function handleLogoDelete() {
     if (!window.confirm("Hinterlegtes Logo für alle Projekte entfernen?")) {
       return;
@@ -213,6 +251,19 @@ export default function ProjectPrintPage() {
             <option value="a3">A3 quer</option>
           </select>
         </label>
+        <button
+          className="btn btn-sm btn-outline-primary"
+          disabled={isBusy}
+          onClick={() =>
+            setOfficeDraft({
+              officeName: office.officeName ?? "",
+              officeAddress: office.officeAddress ?? "",
+            })
+          }
+          type="button"
+        >
+          Büroangaben
+        </button>
         <label className={`btn btn-sm btn-outline-primary mb-0${isBusy ? " disabled" : ""}`}>
           {logo ? "Logo ersetzen" : "Logo hinterlegen"}
           <input
@@ -245,11 +296,56 @@ export default function ProjectPrintPage() {
           Zum Projekt
         </Link>
       </div>
+      {officeDraft ? (
+        <FormModal
+          description="Planverfasser auf dem Deckblatt. Gilt für alle Projekte."
+          isSaving={isBusy}
+          onClose={() => setOfficeDraft(null)}
+          onSubmit={handleOfficeSave}
+          submitLabel="Büroangaben speichern"
+          title="Büroangaben"
+        >
+          <div className="row g-3">
+            <div className="col-12">
+              <label className="form-label" htmlFor="office-name">
+                {officeProfileFieldLabels.officeName}
+              </label>
+              <input
+                autoFocus
+                className="form-control"
+                id="office-name"
+                maxLength={officeProfileFieldMaxLengths.officeName}
+                onChange={(event) =>
+                  setOfficeDraft({ ...officeDraft, officeName: event.target.value })
+                }
+                value={officeDraft.officeName}
+              />
+            </div>
+            <div className="col-12">
+              <label className="form-label" htmlFor="office-address">
+                {officeProfileFieldLabels.officeAddress}
+              </label>
+              <textarea
+                className="form-control"
+                id="office-address"
+                maxLength={officeProfileFieldMaxLengths.officeAddress}
+                onChange={(event) =>
+                  setOfficeDraft({ ...officeDraft, officeAddress: event.target.value })
+                }
+                placeholder={"Straße Nr.\nPLZ Ort"}
+                rows={3}
+                value={officeDraft.officeAddress}
+              />
+            </div>
+          </div>
+        </FormModal>
+      ) : null}
       {data ? (
         <PrintDocument
           entries={entries}
           logoSrc={logoSrc}
           namedSnapshots={data.namedSnapshots}
+          office={office}
           printedAt={printedAt}
           project={data.project}
         />