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-state-snapshot.model.ts

@@ -4,6 +4,10 @@ import {
   distributionBoardSupplyTypes,
   type DistributionBoardInfoField,
 } from "../../shared/constants/distribution-board.js";
+import {
+  projectCoverFieldMaxLengths,
+  type ProjectCoverField,
+} from "../../shared/constants/project-cover.js";
 import {
   circuitGroupCategories,
 } from "../../shared/constants/circuit-group.js";
@@ -63,10 +67,30 @@ const previousProjectSchema = z
   })
   .strict();
 
-const projectSchema = previousProjectSchema
+const publicBuildingProjectSchema = previousProjectSchema
   .extend({ isPublicBuilding: z.boolean() })
   .strict();
 
+const projectCoverValueSchema = (field: ProjectCoverField) =>
+  z.string().trim().min(1).max(projectCoverFieldMaxLengths[field]).nullable();
+
+// Schema version 6 adds the print cover fields.
+const projectSchema = publicBuildingProjectSchema
+  .extend({
+    siteAddress: projectCoverValueSchema("siteAddress"),
+    workStage: projectCoverValueSchema("workStage"),
+    projectLead: projectCoverValueSchema("projectLead"),
+    projectEditor: projectCoverValueSchema("projectEditor"),
+  })
+  .strict();
+
+const emptyProjectCoverValues = {
+  siteAddress: null,
+  workStage: null,
+  projectLead: null,
+  projectEditor: null,
+};
+
 const legacyDistributionBoardSchema = z
   .object({
     id: idSchema,
@@ -494,7 +518,7 @@ export const projectStateSnapshotSchema = z
 const boardInfoProjectStateSnapshotSchema = z
   .object({
     schemaVersion: z.literal(boardInfoProjectStateSnapshotSchemaVersion),
-    project: projectSchema,
+    project: publicBuildingProjectSchema,
     distributionBoards: z.array(legacyDistributionBoardSchema),
     externalCsvConfiguration: externalCsvConfigurationSnapshotSchema.nullable(),
     externalModel: externalModelStateSchema,
@@ -505,7 +529,7 @@ const boardInfoProjectStateSnapshotSchema = z
 const previousProjectStateSnapshotSchema = z
   .object({
     schemaVersion: z.literal(previousProjectStateSnapshotSchemaVersion),
-    project: projectSchema,
+    project: publicBuildingProjectSchema,
     distributionBoards: z.array(legacyDistributionBoardSchema),
     externalCsvConfiguration: externalCsvConfigurationSnapshotSchema.nullable(),
     externalModel: externalModelStateSchema,
@@ -516,7 +540,7 @@ const previousProjectStateSnapshotSchema = z
 const externalModelProjectStateSnapshotSchema = z
   .object({
     schemaVersion: z.literal(externalModelProjectStateSnapshotSchemaVersion),
-    project: projectSchema,
+    project: publicBuildingProjectSchema,
     distributionBoards: z.array(legacyDistributionBoardSchema),
     externalCsvConfiguration: externalCsvConfigurationSnapshotSchema.nullable(),
     ...projectStateSnapshotContents,
@@ -526,7 +550,7 @@ const externalModelProjectStateSnapshotSchema = z
 const legacyProjectStateSnapshotSchema = z
   .object({
     schemaVersion: z.literal(legacyProjectStateSnapshotSchemaVersion),
-    project: projectSchema,
+    project: publicBuildingProjectSchema,
     distributionBoards: z.array(legacyDistributionBoardSchema),
     ...projectStateSnapshotContents,
   })
@@ -581,12 +605,14 @@ function upgradePreviousProjectStateSnapshot(value: unknown): unknown {
   }
   const schemaVersion = (value as { schemaVersion: number }).schemaVersion;
   // Every supported version before 6 lacks the distribution-board info
-  // fields; they are upgraded as empty (null) values.
+  // fields and the project cover fields; they are upgraded as empty (null)
+  // values.
   if (schemaVersion === boardInfoProjectStateSnapshotSchemaVersion) {
     const previous = boardInfoProjectStateSnapshotSchema.parse(value);
     return {
       ...previous,
       schemaVersion: projectStateSnapshotSchemaVersion,
+      project: { ...previous.project, ...emptyProjectCoverValues },
       distributionBoards: withEmptyDistributionBoardInfo(
         previous.distributionBoards
       ),
@@ -597,6 +623,7 @@ function upgradePreviousProjectStateSnapshot(value: unknown): unknown {
     return {
       ...previous,
       schemaVersion: projectStateSnapshotSchemaVersion,
+      project: { ...previous.project, ...emptyProjectCoverValues },
       distributionBoards: withEmptyDistributionBoardInfo(
         previous.distributionBoards
       ),
@@ -607,6 +634,7 @@ function upgradePreviousProjectStateSnapshot(value: unknown): unknown {
     return {
       ...previous,
       schemaVersion: projectStateSnapshotSchemaVersion,
+      project: { ...previous.project, ...emptyProjectCoverValues },
       distributionBoards: withEmptyDistributionBoardInfo(
         previous.distributionBoards
       ),
@@ -618,6 +646,7 @@ function upgradePreviousProjectStateSnapshot(value: unknown): unknown {
     return {
       ...legacy,
       schemaVersion: projectStateSnapshotSchemaVersion,
+      project: { ...legacy.project, ...emptyProjectCoverValues },
       distributionBoards: withEmptyDistributionBoardInfo(
         legacy.distributionBoards
       ),
@@ -630,7 +659,11 @@ function upgradePreviousProjectStateSnapshot(value: unknown): unknown {
     return {
       ...baseline,
       schemaVersion: projectStateSnapshotSchemaVersion,
-      project: { ...baseline.project, isPublicBuilding: false },
+      project: {
+        ...baseline.project,
+        isPublicBuilding: false,
+        ...emptyProjectCoverValues,
+      },
       distributionBoards: withEmptyDistributionBoardInfo(
         baseline.distributionBoards
       ),