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/frontend/print/print-document.tsx

@@ -5,6 +5,7 @@ import type {
   CircuitTreeCircuitDto,
   CircuitTreeComponentDto,
   CircuitTreeDeviceRowDto,
+  OfficeProfileDto,
   ProjectDto,
   ProjectSnapshotMetadataDto,
 } from "../types";
@@ -18,17 +19,23 @@ import {
   type PrintBoardHierarchyEntry,
 } from "./print-document-model";
 
-// Provisional office data until the project/cover fields are added.
-export const printOfficeName = "kbp köhler beraten + planen GmbH";
-
 export interface PrintDocumentProps {
   project: ProjectDto;
+  office: OfficeProfileDto;
   entries: PrintBoardHierarchyEntry[];
   namedSnapshots: ProjectSnapshotMetadataDto[];
   logoSrc: string | null;
   printedAt: Date;
 }
 
+/** Shows a value or the orange "[ergänzen]" marker for missing data. */
+function Value({ value, multiline = false }: { value: string | null; multiline?: boolean }) {
+  if (!value) {
+    return <Placeholder />;
+  }
+  return multiline ? <span className="pd-multiline">{value}</span> : <>{value}</>;
+}
+
 const dateFormat = new Intl.DateTimeFormat("de-DE", {
   day: "2-digit",
   month: "2-digit",
@@ -129,6 +136,7 @@ function boardLabel(entry: PrintBoardHierarchyEntry) {
 
 function CoverSheet({
   project,
+  office,
   entries,
   namedSnapshots,
   logoSrc,
@@ -149,11 +157,11 @@ function CoverSheet({
         <caption>Projekt</caption>
         <tbody>
           <tr><th>Bauvorhaben</th><td>{project.name}</td></tr>
-          <tr><th>Anschrift</th><td><Placeholder /></td></tr>
-          <tr><th>Bauherr</th><td>{project.buildingOwner ?? <Placeholder />}</td></tr>
-          <tr><th>Projektnummer intern</th><td>{project.internalProjectNumber ?? <Placeholder />}</td></tr>
-          <tr><th>Projektnummer extern</th><td>{project.externalProjectNumber ?? <Placeholder />}</td></tr>
-          <tr><th>Leistungsphase</th><td><Placeholder /></td></tr>
+          <tr><th>Anschrift</th><td><Value multiline value={project.siteAddress} /></td></tr>
+          <tr><th>Bauherr</th><td><Value value={project.buildingOwner} /></td></tr>
+          <tr><th>Projektnummer intern</th><td><Value value={project.internalProjectNumber} /></td></tr>
+          <tr><th>Projektnummer extern</th><td><Value value={project.externalProjectNumber} /></td></tr>
+          <tr><th>Leistungsphase</th><td><Value value={project.workStage} /></td></tr>
           <tr><th>Gewerk</th><td>KG 440 – Starkstromanlagen</td></tr>
           <tr><th>Beschreibung</th><td>{project.description ?? "–"}</td></tr>
         </tbody>
@@ -163,10 +171,10 @@ function CoverSheet({
         <table className="pd-kv">
           <caption>Planverfasser</caption>
           <tbody>
-            <tr><th>Büro</th><td>{printOfficeName}</td></tr>
-            <tr><th>Anschrift</th><td><Placeholder /></td></tr>
-            <tr><th>Projektleitung</th><td><Placeholder /></td></tr>
-            <tr><th>Bearbeitung</th><td><Placeholder /></td></tr>
+            <tr><th>Büro</th><td><Value value={office.officeName} /></td></tr>
+            <tr><th>Anschrift</th><td><Value multiline value={office.officeAddress} /></td></tr>
+            <tr><th>Projektleitung</th><td><Value value={project.projectLead} /></td></tr>
+            <tr><th>Bearbeitung</th><td><Value value={project.projectEditor} /></td></tr>
           </tbody>
         </table>
         <table className="pd-kv">
@@ -192,7 +200,9 @@ function CoverSheet({
                 <td>{String.fromCharCode(97 + (index % 26))}</td>
                 <td>{dateFormat.format(new Date(snapshot.createdAtIso))}</td>
                 <td>{snapshot.name}</td>
-                <td><Placeholder /></td>
+                {/* Snapshots do not record an editor yet; the project's
+                    current editor is shown for every entry. */}
+                <td><Value value={project.projectEditor} /></td>
               </tr>
             ))
           ) : (
@@ -582,6 +592,7 @@ function SectionRows({
 
 export function PrintDocument({
   project,
+  office,
   entries,
   namedSnapshots,
   logoSrc,
@@ -594,6 +605,7 @@ export function PrintDocument({
         entries={entries}
         logoSrc={logoSrc}
         namedSnapshots={namedSnapshots}
+        office={office}
         project={project}
         stand={stand}
       />