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/domain/models/project-settings-project-command.model.ts

@@ -3,13 +3,23 @@ import {
   distributionBoardSupplyTypes,
   type DistributionBoardSupplyType,
 } from "../../shared/constants/distribution-board.js";
+import {
+  projectCoverFieldMaxLengths,
+  projectCoverFields,
+  type ProjectCoverField,
+} from "../../shared/constants/project-cover.js";
 
 export const projectSettingsUpdateCommandType =
   "project.update-settings" as const;
-export const projectSettingsUpdateCommandSchemaVersion = 2 as const;
-const previousProjectSettingsUpdateCommandSchemaVersion = 1 as const;
+// Version 3 adds the print cover fields. Versions 2 (without cover fields)
+// and 1 (additionally without the public-building flag) stay executable;
+// their missing values keep the current project values.
+export const projectSettingsUpdateCommandSchemaVersion = 3 as const;
+export const withoutCoverProjectSettingsUpdateCommandSchemaVersion = 2 as const;
+export const baselineProjectSettingsUpdateCommandSchemaVersion = 1 as const;
 
-export interface ProjectSettingsValues {
+export interface ProjectSettingsValues
+  extends Record<ProjectCoverField, string | null> {
   name: string;
   internalProjectNumber: string | null;
   externalProjectNumber: string | null;
@@ -21,8 +31,13 @@ export interface ProjectSettingsValues {
   enabledDistributionBoardSupplyTypes: DistributionBoardSupplyType[];
 }
 
-type PreviousProjectSettingsValues = Omit<
+export type WithoutCoverProjectSettingsValues = Omit<
   ProjectSettingsValues,
+  ProjectCoverField
+>;
+
+export type BaselineProjectSettingsValues = Omit<
+  WithoutCoverProjectSettingsValues,
   "isPublicBuilding"
 >;
 
@@ -32,15 +47,22 @@ export interface CurrentProjectSettingsUpdateProjectCommand
   type: typeof projectSettingsUpdateCommandType;
 }
 
-interface PreviousProjectSettingsUpdateProjectCommand
-  extends SerializedProjectCommand<PreviousProjectSettingsValues> {
-  schemaVersion: typeof previousProjectSettingsUpdateCommandSchemaVersion;
+export interface WithoutCoverProjectSettingsUpdateProjectCommand
+  extends SerializedProjectCommand<WithoutCoverProjectSettingsValues> {
+  schemaVersion: typeof withoutCoverProjectSettingsUpdateCommandSchemaVersion;
+  type: typeof projectSettingsUpdateCommandType;
+}
+
+export interface BaselineProjectSettingsUpdateProjectCommand
+  extends SerializedProjectCommand<BaselineProjectSettingsValues> {
+  schemaVersion: typeof baselineProjectSettingsUpdateCommandSchemaVersion;
   type: typeof projectSettingsUpdateCommandType;
 }
 
 export type ProjectSettingsUpdateProjectCommand =
   | CurrentProjectSettingsUpdateProjectCommand
-  | PreviousProjectSettingsUpdateProjectCommand;
+  | WithoutCoverProjectSettingsUpdateProjectCommand
+  | BaselineProjectSettingsUpdateProjectCommand;
 
 export function createProjectSettingsUpdateProjectCommand(
   values: ProjectSettingsValues
@@ -60,7 +82,10 @@ export function assertProjectSettingsUpdateProjectCommand(
   if (
     command.type !== projectSettingsUpdateCommandType ||
     (command.schemaVersion !== projectSettingsUpdateCommandSchemaVersion &&
-      command.schemaVersion !== previousProjectSettingsUpdateCommandSchemaVersion)
+      command.schemaVersion !==
+        withoutCoverProjectSettingsUpdateCommandSchemaVersion &&
+      command.schemaVersion !==
+        baselineProjectSettingsUpdateCommandSchemaVersion)
   ) {
     throw new Error("Unsupported project settings update command.");
   }
@@ -91,13 +116,23 @@ export function assertProjectSettingsUpdateProjectCommand(
       "Project settings update command contains invalid supply types."
     );
   }
-  const isPreviousSchema =
-    command.schemaVersion === previousProjectSettingsUpdateCommandSchemaVersion;
+  const payload = command.payload;
+  const expectedKeyCount =
+    command.schemaVersion === baselineProjectSettingsUpdateCommandSchemaVersion
+      ? 8
+      : command.schemaVersion ===
+          withoutCoverProjectSettingsUpdateCommandSchemaVersion
+        ? 9
+        : 9 + projectCoverFields.length;
   if (
-    (isPreviousSchema && Object.keys(command.payload).length !== 8) ||
-    (!isPreviousSchema &&
-      (typeof command.payload.isPublicBuilding !== "boolean" ||
-        Object.keys(command.payload).length !== 9))
+    Object.keys(payload).length !== expectedKeyCount ||
+    (command.schemaVersion !==
+      baselineProjectSettingsUpdateCommandSchemaVersion &&
+      typeof payload.isPublicBuilding !== "boolean") ||
+    (command.schemaVersion === projectSettingsUpdateCommandSchemaVersion &&
+      !projectCoverFields.every((field) =>
+        isNullableTrimmedString(payload[field], projectCoverFieldMaxLengths[field])
+      ))
   ) {
     throw new Error(
       "Project settings update command contains invalid values."