Merge branch 'master' of git.ozg-sh.de:mgm/goofy

# Conflicts:
#	goofy-client/libs/postfach/src/lib/postfach-page-container/postfach-page/postfach-page.component.spec.ts

goofy-client/libs/postfach/src/lib/postfach-mail-list-container/postfach-mail-list/postfach-mail/outgoing-mail/outgoing-mail.component.ts

@@ -10,5 +10,5 @@ export class OutgoingMailComponent {
 
 	@Input() postfachMail: PostfachMailResource;
 
-	postfachMailLinkRel = PostfachMailLinkRel;
+	readonly postfachMailLinkRel = PostfachMailLinkRel;
 }

goofy-client/libs/postfach/src/lib/postfach-page-container/postfach-page/postfach-page-mail-list/postfach-page-mail/postfach-page-mail.component.html

-<pre>{{ postfachMail | json }}</pre>
+<goofy-client-user-profile-in-postfach-mail-container *ngIf="postfachMail | hasLink: postfachMailLinkRel.CREATED_BY"
+		data-test-id="mail-user-profile"
+		[postfachMail]="postfachMail">
+</goofy-client-user-profile-in-postfach-mail-container>
+<div>{{ postfachMail.subject }}</div>
+<div>{{ postfachMail.mailBody }}</div>

goofy-client/libs/postfach/src/lib/postfach-page-container/postfach-page/postfach-page-mail-list/postfach-page-mail/postfach-page-mail.component.scss

+:host {
+	display: flex;
+	flex-direction: column;
+	width: 100%;
+	border-bottom: 1px solid rgb(0 0 0 / 8%);
+	padding: 16px 24px 16px 28px;
+}

goofy-client/libs/postfach/src/lib/postfach-page-container/postfach-page/postfach-page-mail-list/postfach-page-mail/postfach-page-mail.component.spec.ts

 import { ComponentFixture, TestBed } from '@angular/core/testing';
 
 import { PostfachPageMailComponent } from './postfach-page-mail.component';
+import { MockComponent } from 'ng-mocks';
+import { UserProfileInPostfachMailContainerComponent } from '@goofy-client/user-profile';
+import { HasLinkPipe } from '@goofy-client/tech-shared';
+import { createPostfachMailResource } from '../../../../../../../postfach-shared/test/postfach';
 
 describe('PostfachPageMailComponent', () => {
 	let component: PostfachPageMailComponent;
@@ -8,7 +12,11 @@ describe('PostfachPageMailComponent', () => {
 
 	beforeEach(async () => {
 		await TestBed.configureTestingModule({
-      declarations: [ PostfachPageMailComponent ]
+			declarations: [
+				PostfachPageMailComponent,
+				MockComponent(UserProfileInPostfachMailContainerComponent),
+				HasLinkPipe
+			]
 		})
 			.compileComponents();
 	});
@@ -16,6 +24,7 @@ describe('PostfachPageMailComponent', () => {
 	beforeEach(() => {
 		fixture = TestBed.createComponent(PostfachPageMailComponent);
 		component = fixture.componentInstance;
+		component.postfachMail = createPostfachMailResource();
 		fixture.detectChanges();
 	});
 

goofy-client/libs/postfach/src/lib/postfach-page-container/postfach-page/postfach-page-mail-list/postfach-page-mail/postfach-page-mail.component.ts

 import { Component, Input, OnInit } from '@angular/core';
-import { PostfachMailResource } from '@goofy-client/postfach-shared';
+import { PostfachMailLinkRel, PostfachMailResource } from '@goofy-client/postfach-shared';
 
 @Component({
   selector: 'goofy-client-postfach-page-mail',
@@ -10,6 +10,8 @@ export class PostfachPageMailComponent implements OnInit {
 
 	@Input() postfachMail: PostfachMailResource;
 
+	readonly postfachMailLinkRel = PostfachMailLinkRel;
+
   constructor() { }
 
   ngOnInit(): void {

goofy-client/libs/postfach/src/lib/postfach-page-container/postfach-page/postfach-page.component.html

-<goofy-client-subnavigation></goofy-client-subnavigation>
+<goofy-client-subnavigation>
+	<a routerLink="../" mat-icon-button data-test-id="back-button" class="back-button" aria-label="back button with arrow icon" matTooltip="zurück zur Detailseite">
+		<mat-icon>arrow_back</mat-icon>
+	</a>
+</goofy-client-subnavigation>
 
 <goofy-client-vorgang-in-postfach-breadcrumb-container></goofy-client-vorgang-in-postfach-breadcrumb-container>
 

goofy-client/libs/postfach/src/lib/postfach-page-container/postfach-page/postfach-page.component.spec.ts

 import { ComponentFixture, TestBed } from '@angular/core/testing';
+import { MatIcon } from '@angular/material/icon';
 import { SubnavigationComponent } from '@goofy-client/ui';
 import { VorgangInPostfachBreadcrumbContainerComponent } from '@goofy-client/vorgang-shared';
 import { MockComponent } from 'ng-mocks';
@@ -13,6 +14,7 @@ describe('PostfachPageComponent', () => {
 		await TestBed.configureTestingModule({
 			declarations: [
 				PostfachPageComponent,
+				MatIcon,
 				MockComponent(SubnavigationComponent),
 				MockComponent(PostfachPageMailListComponent),
 				MockComponent(VorgangInPostfachBreadcrumbContainerComponent)