Merge pull request 'Add dark mode theme with toggle button and improved UI styling' (#1) from ui-improvements into main

Reviewed-on: #1

frontend/angular.json

@@ -30,7 +30,6 @@
               }
             ],
             "styles": [
-              "node_modules/@angular/material/prebuilt-themes/indigo-pink.css",
               "src/styles.scss"
             ]
           },
@@ -48,7 +47,13 @@
                   "maximumError": "8kB"
                 }
               ],
-              "outputHashing": "all"
+              "outputHashing": "all",
+              "fileReplacements": [
+                {
+                  "replace": "src/environments/environment.ts",
+                  "with": "src/environments/environment.prod.ts"
+                }
+              ]
             },
             "development": {
               "optimization": false,

frontend/src/app/app.html

@@ -5,6 +5,11 @@
   </a>
   <span class="spacer"></span>
 
+  <!-- Dark Mode Toggle -->
+  <button mat-icon-button (click)="toggleTheme()" [matTooltip]="(darkMode$ | async) ? 'Light Mode' : 'Dark Mode'">
+    <mat-icon>{{ (darkMode$ | async) ? 'light_mode' : 'dark_mode' }}</mat-icon>
+  </button>
+
   <!-- Show 'edit' icon if not in admin view -->
   <a *ngIf="!isAdminView" mat-icon-button routerLink="/admin" matTooltip="Edit Dashboard Items">
     <mat-icon>edit</mat-icon>

frontend/src/app/app.ts

@@ -1,8 +1,10 @@
 import { Component, OnInit } from '@angular/core';
 import { RouterModule, RouterOutlet, Router, NavigationEnd } from '@angular/router';
 import { MaterialModule } from './material.module';
+import { ThemeService } from './services/theme.service';
 import { filter } from 'rxjs/operators';
 import { CommonModule } from '@angular/common';
+import { Observable } from 'rxjs';
 
 @Component({
   selector: 'app-root',
@@ -14,8 +16,14 @@ import { CommonModule } from '@angular/common';
 export class AppComponent implements OnInit {
   title = 'frontend';
   isAdminView = false;
+  darkMode$: Observable<boolean>;
 
-  constructor(private router: Router) {}
+  constructor(
+    private router: Router,
+    private themeService: ThemeService
+  ) {
+    this.darkMode$ = this.themeService.darkMode$;
+  }
 
   ngOnInit() {
     this.router.events.pipe(
@@ -24,4 +32,8 @@ export class AppComponent implements OnInit {
       this.isAdminView = event.urlAfterRedirects === '/admin';
     });
   }
+
+  toggleTheme(): void {
+    this.themeService.toggleTheme();
+  }
 }

frontend/src/app/components/home/home.ts

@@ -31,6 +31,8 @@ export class HomeComponent implements OnInit {
   }
   
   isMaterialIcon(iconUrl: string): boolean {
-    return this.iconService.isValidIcon(iconUrl);
+    // Akzeptiere alle Werte die wie Icon-Namen aussehen (nur Kleinbuchstaben und Unterstriche)
+    // Nicht nur die in der kuratierten Liste
+    return this.iconService.looksLikeIconName(iconUrl);
   }
 }

frontend/src/app/components/item-form/item-form.html

@@ -44,6 +44,14 @@
             </mat-autocomplete>
           </mat-form-field>
           
+          <!-- Link zu allen Material Icons -->
+          <div class="icon-browse-link">
+            <a href="https://fonts.google.com/icons?icon.set=Material+Icons" target="_blank" rel="noopener noreferrer">
+              <mat-icon>open_in_new</mat-icon>
+              Alle 2000+ Material Icons durchsuchen
+            </a>
+          </div>
+          
           <!-- Icon Vorschau -->
           <div class="icon-preview" *ngIf="itemForm.get('iconName')?.value">
             <span class="preview-label">Vorschau:</span>

frontend/src/app/components/item-form/item-form.scss

@@ -8,6 +8,20 @@ mat-card {
   width: 100%;
 }
 
+::ng-deep .mat-mdc-card-title {
+  display: block !important;
+  margin-bottom: 24px !important;
+  padding: 16px 0 !important;
+  border-bottom: 1px solid rgba(0, 0, 0, 0.12) !important;
+  font-size: 24px !important;
+  font-weight: 500 !important;
+  text-align: center !important;
+}
+
+:host-context(.dark-theme) ::ng-deep .mat-mdc-card-title {
+  border-bottom-color: rgba(255, 255, 255, 0.12) !important;
+}
+
 mat-form-field {
   width: 100%;
   margin-bottom: 10px;
@@ -20,11 +34,56 @@ mat-form-field {
   margin-top: 20px;
 }
 
+:host-context(.dark-theme) .actions button[mat-stroked-button] {
+  border-color: rgba(255, 255, 255, 0.3) !important;
+  color: #ffffff !important;
+
+  &:hover {
+    background-color: rgba(255, 255, 255, 0.08) !important;
+    border-color: rgba(255, 255, 255, 0.5) !important;
+  }
+}
+
+::ng-deep .dark-theme .mat-mdc-stroked-button {
+  border-color: rgba(255, 255, 255, 0.3) !important;
+  color: #ffffff !important;
+
+  &:hover {
+    background-color: rgba(255, 255, 255, 0.08) !important;
+    border-color: rgba(255, 255, 255, 0.5) !important;
+  }
+}
+
 .icon-mode-toggle {
   margin: 16px 0;
 }
 
 .icon-picker-section {
+  .icon-browse-link {
+    margin-bottom: 16px;
+    
+    a {
+      display: inline-flex;
+      align-items: center;
+      gap: 8px;
+      color: #1976d2;
+      text-decoration: none;
+      font-size: 14px;
+      transition: color 0.2s;
+      
+      &:hover {
+        color: #1565c0;
+        text-decoration: underline;
+      }
+      
+      mat-icon {
+        font-size: 18px;
+        width: 18px;
+        height: 18px;
+      }
+    }
+  }
+  
   .icon-preview {
     display: flex;
     align-items: center;

frontend/src/app/components/item-form/item-form.ts

@@ -118,7 +118,7 @@ export class ItemFormComponent implements OnInit {
       
       if (this.isEditMode) {
         this.apiService.updateItem(this.itemId!, itemData).subscribe(() => {
-          this.router.navigate(['/']);
+          this.router.navigate(['/admin']);
         });
       } else {
         this.apiService.createItem(itemData).subscribe(() => {
@@ -129,6 +129,6 @@ export class ItemFormComponent implements OnInit {
   }
 
   cancel(): void {
-    this.router.navigate(['/']);
+    this.router.navigate(['/admin']);
   }
 }

frontend/src/app/components/item-list/item-list.scss

@@ -2,6 +2,22 @@
   padding: 20px;
 }
 
+mat-card {
+  ::ng-deep .mat-mdc-card-title {
+    display: block !important;
+    margin-bottom: 24px !important;
+    padding: 16px 0 !important;
+    border-bottom: 1px solid rgba(0, 0, 0, 0.12) !important;
+    font-size: 24px !important;
+    font-weight: 500 !important;
+    text-align: center !important;
+  }
+}
+
+:host-context(.dark-theme) mat-card ::ng-deep .mat-mdc-card-title {
+  border-bottom-color: rgba(255, 255, 255, 0.12) !important;
+}
+
 .fab-button {
   position: fixed;
   bottom: 20px;

frontend/src/app/services/api.ts

@@ -2,12 +2,13 @@ import { Injectable } from '@angular/core';
 import { HttpClient } from '@angular/common/http';
 import { Observable } from 'rxjs';
 import { Item } from '../models/item';
+import { environment } from '../../environments/environment';
 
 @Injectable({
   providedIn: 'root'
 })
 export class Api {
-  private apiUrl = '/api/items';
+  private apiUrl = environment.apiUrl;
 
   constructor(private http: HttpClient) { }
 

frontend/src/app/services/icon.service.ts

@@ -18,8 +18,17 @@ export class IconService {
     { name: 'apps', category: 'Navigation' },
     { name: 'arrow_back', category: 'Navigation' },
     { name: 'arrow_forward', category: 'Navigation' },
+    { name: 'arrow_upward', category: 'Navigation' },
+    { name: 'arrow_downward', category: 'Navigation' },
     { name: 'expand_more', category: 'Navigation' },
     { name: 'expand_less', category: 'Navigation' },
+    { name: 'fullscreen', category: 'Navigation' },
+    { name: 'fullscreen_exit', category: 'Navigation' },
+    { name: 'refresh', category: 'Navigation' },
+    { name: 'more_vert', category: 'Navigation' },
+    { name: 'more_horiz', category: 'Navigation' },
+    { name: 'close', category: 'Navigation' },
+    { name: 'check', category: 'Navigation' },
     
     // Web & Browser
     { name: 'web', category: 'Web' },
@@ -29,96 +38,267 @@ export class IconService {
     { name: 'http', category: 'Web' },
     { name: 'https', category: 'Web' },
     { name: 'vpn_lock', category: 'Web' },
+    { name: 'domain', category: 'Web' },
+    { name: 'dns', category: 'Web' },
+    { name: 'wifi', category: 'Web' },
+    { name: 'router', category: 'Web' },
+    { name: 'storage', category: 'Web' },
+    { name: 'cloud_queue', category: 'Web' },
+    { name: 'cloud_done', category: 'Web' },
+    { name: 'cloud_off', category: 'Web' },
     
     // Kommunikation
     { name: 'email', category: 'Kommunikation' },
     { name: 'mail', category: 'Kommunikation' },
+    { name: 'mail_outline', category: 'Kommunikation' },
     { name: 'chat', category: 'Kommunikation' },
+    { name: 'chat_bubble', category: 'Kommunikation' },
     { name: 'message', category: 'Kommunikation' },
     { name: 'forum', category: 'Kommunikation' },
     { name: 'phone', category: 'Kommunikation' },
+    { name: 'call', category: 'Kommunikation' },
+    { name: 'video_call', category: 'Kommunikation' },
+    { name: 'voicemail', category: 'Kommunikation' },
+    { name: 'textsms', category: 'Kommunikation' },
+    { name: 'contact_mail', category: 'Kommunikation' },
+    { name: 'contacts', category: 'Kommunikation' },
     
     // Content
     { name: 'create', category: 'Content' },
     { name: 'edit', category: 'Content' },
     { name: 'add', category: 'Content' },
+    { name: 'add_circle', category: 'Content' },
+    { name: 'remove', category: 'Content' },
     { name: 'delete', category: 'Content' },
+    { name: 'delete_outline', category: 'Content' },
     { name: 'content_copy', category: 'Content' },
+    { name: 'content_cut', category: 'Content' },
+    { name: 'content_paste', category: 'Content' },
     { name: 'save', category: 'Content' },
+    { name: 'save_alt', category: 'Content' },
+    { name: 'undo', category: 'Content' },
+    { name: 'redo', category: 'Content' },
+    { name: 'archive', category: 'Content' },
+    { name: 'unarchive', category: 'Content' },
+    { name: 'flag', category: 'Content' },
+    { name: 'sort', category: 'Content' },
+    { name: 'filter_list', category: 'Content' },
     
     // Dateien & Ordner
     { name: 'folder', category: 'Dateien' },
     { name: 'folder_open', category: 'Dateien' },
+    { name: 'folder_shared', category: 'Dateien' },
+    { name: 'folder_special', category: 'Dateien' },
+    { name: 'create_new_folder', category: 'Dateien' },
     { name: 'description', category: 'Dateien' },
     { name: 'insert_drive_file', category: 'Dateien' },
+    { name: 'text_snippet', category: 'Dateien' },
+    { name: 'article', category: 'Dateien' },
+    { name: 'attachment', category: 'Dateien' },
     { name: 'cloud', category: 'Dateien' },
     { name: 'cloud_upload', category: 'Dateien' },
     { name: 'cloud_download', category: 'Dateien' },
+    { name: 'download', category: 'Dateien' },
+    { name: 'upload', category: 'Dateien' },
+    { name: 'file_download', category: 'Dateien' },
+    { name: 'file_upload', category: 'Dateien' },
     
     // Medien
     { name: 'image', category: 'Medien' },
     { name: 'photo', category: 'Medien' },
+    { name: 'photo_camera', category: 'Medien' },
+    { name: 'photo_library', category: 'Medien' },
     { name: 'video_library', category: 'Medien' },
     { name: 'movie', category: 'Medien' },
+    { name: 'videocam', category: 'Medien' },
     { name: 'music_note', category: 'Medien' },
     { name: 'audiotrack', category: 'Medien' },
+    { name: 'library_music', category: 'Medien' },
+    { name: 'play_arrow', category: 'Medien' },
+    { name: 'pause', category: 'Medien' },
+    { name: 'stop', category: 'Medien' },
+    { name: 'skip_next', category: 'Medien' },
+    { name: 'skip_previous', category: 'Medien' },
+    { name: 'volume_up', category: 'Medien' },
+    { name: 'volume_off', category: 'Medien' },
     
     // Business
     { name: 'work', category: 'Business' },
     { name: 'business', category: 'Business' },
+    { name: 'business_center', category: 'Business' },
     { name: 'store', category: 'Business' },
+    { name: 'storefront', category: 'Business' },
     { name: 'shopping_cart', category: 'Business' },
+    { name: 'shopping_bag', category: 'Business' },
     { name: 'payment', category: 'Business' },
+    { name: 'credit_card', category: 'Business' },
     { name: 'account_balance', category: 'Business' },
+    { name: 'account_balance_wallet', category: 'Business' },
+    { name: 'monetization_on', category: 'Business' },
+    { name: 'attach_money', category: 'Business' },
+    { name: 'trending_up', category: 'Business' },
+    { name: 'trending_down', category: 'Business' },
+    { name: 'show_chart', category: 'Business' },
+    { name: 'bar_chart', category: 'Business' },
+    { name: 'pie_chart', category: 'Business' },
     
     // Sozial
     { name: 'person', category: 'Sozial' },
+    { name: 'person_outline', category: 'Sozial' },
     { name: 'people', category: 'Sozial' },
     { name: 'group', category: 'Sozial' },
     { name: 'account_circle', category: 'Sozial' },
+    { name: 'account_box', category: 'Sozial' },
     { name: 'favorite', category: 'Sozial' },
+    { name: 'favorite_border', category: 'Sozial' },
+    { name: 'thumb_up', category: 'Sozial' },
+    { name: 'thumb_down', category: 'Sozial' },
     { name: 'share', category: 'Sozial' },
+    { name: 'cake', category: 'Sozial' },
+    { name: 'public', category: 'Sozial' },
+    { name: 'sentiment_satisfied', category: 'Sozial' },
+    { name: 'mood', category: 'Sozial' },
     
     // System
     { name: 'settings', category: 'System' },
+    { name: 'settings_applications', category: 'System' },
     { name: 'build', category: 'System' },
+    { name: 'build_circle', category: 'System' },
     { name: 'search', category: 'System' },
     { name: 'info', category: 'System' },
+    { name: 'info_outline', category: 'System' },
     { name: 'help', category: 'System' },
+    { name: 'help_outline', category: 'System' },
     { name: 'warning', category: 'System' },
     { name: 'error', category: 'System' },
+    { name: 'error_outline', category: 'System' },
     { name: 'check_circle', category: 'System' },
+    { name: 'check_circle_outline', category: 'System' },
     { name: 'notifications', category: 'System' },
+    { name: 'notifications_active', category: 'System' },
+    { name: 'notifications_off', category: 'System' },
+    { name: 'update', category: 'System' },
+    { name: 'sync', category: 'System' },
+    { name: 'power_settings_new', category: 'System' },
+    { name: 'visibility', category: 'System' },
+    { name: 'visibility_off', category: 'System' },
     
     // Geräte
     { name: 'computer', category: 'Geräte' },
+    { name: 'desktop_windows', category: 'Geräte' },
     { name: 'phone_android', category: 'Geräte' },
+    { name: 'phone_iphone', category: 'Geräte' },
     { name: 'tablet', category: 'Geräte' },
+    { name: 'tablet_mac', category: 'Geräte' },
     { name: 'laptop', category: 'Geräte' },
+    { name: 'laptop_mac', category: 'Geräte' },
     { name: 'tv', category: 'Geräte' },
     { name: 'watch', category: 'Geräte' },
+    { name: 'smartphone', category: 'Geräte' },
+    { name: 'devices', category: 'Geräte' },
+    { name: 'headset', category: 'Geräte' },
+    { name: 'keyboard', category: 'Geräte' },
+    { name: 'mouse', category: 'Geräte' },
+    { name: 'print', category: 'Geräte' },
+    { name: 'scanner', category: 'Geräte' },
     
-    // Entwicklung
+    // Entwicklung & Git
     { name: 'code', category: 'Entwicklung' },
+    { name: 'code_off', category: 'Entwicklung' },
     { name: 'developer_mode', category: 'Entwicklung' },
     { name: 'bug_report', category: 'Entwicklung' },
     { name: 'terminal', category: 'Entwicklung' },
     { name: 'api', category: 'Entwicklung' },
+    { name: 'integration_instructions', category: 'Entwicklung' },
+    { name: 'source', category: 'Entwicklung' },
+    { name: 'account_tree', category: 'Entwicklung' },
+    { name: 'fork_right', category: 'Entwicklung' },
+    { name: 'merge_type', category: 'Entwicklung' },
+    { name: 'commit', category: 'Entwicklung' },
+    { name: 'compare_arrows', category: 'Entwicklung' },
+    { name: 'difference', category: 'Entwicklung' },
+    { name: 'webhook', category: 'Entwicklung' },
+    { name: 'data_object', category: 'Entwicklung' },
+    { name: 'database', category: 'Entwicklung' },
+    { name: 'schema', category: 'Entwicklung' },
+    { name: 'memory', category: 'Entwicklung' },
+    { name: 'developer_board', category: 'Entwicklung' },
     
     // Sicherheit
     { name: 'lock', category: 'Sicherheit' },
     { name: 'lock_open', category: 'Sicherheit' },
+    { name: 'lock_outline', category: 'Sicherheit' },
     { name: 'security', category: 'Sicherheit' },
     { name: 'verified_user', category: 'Sicherheit' },
+    { name: 'verified', category: 'Sicherheit' },
     { name: 'vpn_key', category: 'Sicherheit' },
+    { name: 'vpn_lock', category: 'Sicherheit' },
+    { name: 'shield', category: 'Sicherheit' },
+    { name: 'fingerprint', category: 'Sicherheit' },
+    { name: 'admin_panel_settings', category: 'Sicherheit' },
+    { name: 'privacy_tip', category: 'Sicherheit' },
+    { name: 'key', category: 'Sicherheit' },
+    
+    // Orte & Karten
+    { name: 'location_on', category: 'Orte' },
+    { name: 'location_off', category: 'Orte' },
+    { name: 'map', category: 'Orte' },
+    { name: 'place', category: 'Orte' },
+    { name: 'navigation', category: 'Orte' },
+    { name: 'explore', category: 'Orte' },
+    { name: 'local_cafe', category: 'Orte' },
+    { name: 'local_restaurant', category: 'Orte' },
+    { name: 'local_pizza', category: 'Orte' },
+    { name: 'local_bar', category: 'Orte' },
+    { name: 'local_hotel', category: 'Orte' },
+    { name: 'local_airport', category: 'Orte' },
+    { name: 'flight', category: 'Orte' },
+    { name: 'directions_car', category: 'Orte' },
+    { name: 'directions_bus', category: 'Orte' },
+    { name: 'train', category: 'Orte' },
+    
+    // Zeit & Kalender
+    { name: 'schedule', category: 'Zeit' },
+    { name: 'access_time', category: 'Zeit' },
+    { name: 'alarm', category: 'Zeit' },
+    { name: 'timer', category: 'Zeit' },
+    { name: 'event', category: 'Zeit' },
+    { name: 'calendar_today', category: 'Zeit' },
+    { name: 'calendar_month', category: 'Zeit' },
+    { name: 'date_range', category: 'Zeit' },
+    { name: 'today', category: 'Zeit' },
+    { name: 'history', category: 'Zeit' },
+    
+    // Tools & Utilities
+    { name: 'construction', category: 'Tools' },
+    { name: 'handyman', category: 'Tools' },
+    { name: 'engineering', category: 'Tools' },
+    { name: 'science', category: 'Tools' },
+    { name: 'calculate', category: 'Tools' },
+    { name: 'rule', category: 'Tools' },
+    { name: 'colorize', category: 'Tools' },
+    { name: 'palette', category: 'Tools' },
+    { name: 'brush', category: 'Tools' },
+    { name: 'gradient', category: 'Tools' },
     
     // Verschiedenes
     { name: 'star', category: 'Verschiedenes' },
+    { name: 'star_border', category: 'Verschiedenes' },
+    { name: 'star_half', category: 'Verschiedenes' },
     { name: 'bookmark', category: 'Verschiedenes' },
+    { name: 'bookmark_border', category: 'Verschiedenes' },
     { name: 'label', category: 'Verschiedenes' },
+    { name: 'label_important', category: 'Verschiedenes' },
     { name: 'lightbulb', category: 'Verschiedenes' },
+    { name: 'lightbulb_outline', category: 'Verschiedenes' },
     { name: 'extension', category: 'Verschiedenes' },
     { name: 'widgets', category: 'Verschiedenes' },
+    { name: 'grade', category: 'Verschiedenes' },
+    { name: 'emoji_objects', category: 'Verschiedenes' },
+    { name: 'emoji_events', category: 'Verschiedenes' },
+    { name: 'sports_esports', category: 'Verschiedenes' },
+    { name: 'rocket_launch', category: 'Verschiedenes' },
+    { name: 'campaign', category: 'Verschiedenes' },
   ];
 
   constructor() { }
@@ -153,9 +333,26 @@ export class IconService {
   }
 
   /**
-   * Prüft, ob ein Icon-Name in der Liste existiert
+   * Prüft, ob ein Icon-Name in der kuratierten Liste existiert
+   * Hinweis: Auch andere Material Icon Namen sind gültig, auch wenn sie nicht in der Liste sind
    */
   isValidIcon(iconName: string): boolean {
     return this.icons.some(icon => icon.name === iconName);
   }
+
+  /**
+   * Prüft, ob ein Icon in der kuratierten Liste ist
+   * Gibt true zurück für bekannte Icons, false für unbekannte (aber möglicherweise gültige) Icons
+   */
+  isKnownIcon(iconName: string): boolean {
+    return this.icons.some(icon => icon.name === iconName);
+  }
+
+  /**
+   * Gibt true zurück, wenn der String wahrscheinlich ein Material Icon Name ist
+   * (nur Kleinbuchstaben und Unterstriche)
+   */
+  looksLikeIconName(value: string): boolean {
+    return /^[a-z0-9_]+$/.test(value);
+  }
 }

frontend/src/app/services/theme.service.ts

@@ -0,0 +1,93 @@
+import { Injectable } from '@angular/core';
+import { BehaviorSubject } from 'rxjs';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class ThemeService {
+  private readonly THEME_COOKIE = 'theme-preference';
+  private darkModeSubject = new BehaviorSubject<boolean>(this.getInitialTheme());
+  
+  darkMode$ = this.darkModeSubject.asObservable();
+
+  constructor() {
+    // Theme beim Start anwenden
+    this.applyTheme(this.darkModeSubject.value);
+  }
+
+  /**
+   * Ermittelt das initiale Theme:
+   * 1. Cookie-Präferenz (falls vorhanden)
+   * 2. Browser-System-Einstellung (prefers-color-scheme)
+   */
+  private getInitialTheme(): boolean {
+    const cookieTheme = this.getCookie(this.THEME_COOKIE);
+    
+    if (cookieTheme !== null) {
+      return cookieTheme === 'dark';
+    }
+    
+    // Fallback auf System-Präferenz
+    return window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches;
+  }
+
+  /**
+   * Schaltet zwischen Light und Dark Mode um
+   */
+  toggleTheme(): void {
+    const newTheme = !this.darkModeSubject.value;
+    this.setTheme(newTheme);
+  }
+
+  /**
+   * Setzt ein spezifisches Theme
+   */
+  setTheme(isDark: boolean): void {
+    this.darkModeSubject.next(isDark);
+    this.applyTheme(isDark);
+    this.setCookie(this.THEME_COOKIE, isDark ? 'dark' : 'light', 365);
+  }
+
+  /**
+   * Gibt das aktuelle Theme zurück
+   */
+  isDarkMode(): boolean {
+    return this.darkModeSubject.value;
+  }
+
+  /**
+   * Wendet das Theme auf das Document an
+   */
+  private applyTheme(isDark: boolean): void {
+    if (isDark) {
+      document.body.classList.add('dark-theme');
+    } else {
+      document.body.classList.remove('dark-theme');
+    }
+  }
+
+  /**
+   * Setzt ein Cookie
+   */
+  private setCookie(name: string, value: string, days: number): void {
+    const expires = new Date();
+    expires.setTime(expires.getTime() + days * 24 * 60 * 60 * 1000);
+    document.cookie = `${name}=${value};expires=${expires.toUTCString()};path=/;SameSite=Lax`;
+  }
+
+  /**
+   * Liest ein Cookie aus
+   */
+  private getCookie(name: string): string | null {
+    const nameEQ = name + '=';
+    const ca = document.cookie.split(';');
+    
+    for (let i = 0; i < ca.length; i++) {
+      let c = ca[i];
+      while (c.charAt(0) === ' ') c = c.substring(1, c.length);
+      if (c.indexOf(nameEQ) === 0) return c.substring(nameEQ.length, c.length);
+    }
+    
+    return null;
+  }
+}

frontend/src/environments/environment.prod.ts

@@ -0,0 +1,5 @@
+// Production Environment (Container)
+export const environment = {
+  production: true,
+  apiUrl: '/api/items'  // Relativer Pfad für Nginx Proxy
+};

frontend/src/environments/environment.ts

@@ -0,0 +1,5 @@
+// Development Environment
+export const environment = {
+  production: false,
+  apiUrl: 'http://localhost:8080/api/items'
+};

frontend/src/styles.scss

@@ -1 +1,231 @@
 /* You can add global styles to this file, and also import other style files */
+
+/* Import Material Design Prebuilt Themes */
+@import '@angular/material/prebuilt-themes/indigo-pink.css';
+
+/* Light Theme (Default) */
+:root {
+  --background-color: #fafafa;
+  --card-background: #ffffff;
+  --text-color: #000000;
+  --text-secondary: #666666;
+  --border-color: #e0e0e0;
+}
+
+/* Dark Theme */
+body.dark-theme {
+  --background-color: #121212;
+  --card-background: #1e1e1e;
+  --text-color: #ffffff;
+  --text-secondary: #b0b0b0;
+  --border-color: #333333;
+
+  /* Material Components Dark Theme Override */
+  background-color: var(--background-color);
+  color: var(--text-color);
+
+  /* Material Card Styling */
+  .mat-mdc-card {
+    background-color: var(--card-background) !important;
+    color: var(--text-color) !important;
+  }
+
+  /* Material Form Fields */
+  .mat-mdc-form-field {
+    color: var(--text-color);
+
+    .mat-mdc-form-field-focus-overlay {
+      background-color: rgba(255, 255, 255, 0.05);
+    }
+  }
+
+  .mat-mdc-text-field-wrapper {
+    background-color: #2a2a2a !important;
+  }
+
+  .mat-mdc-form-field-flex {
+    background-color: #2a2a2a !important;
+  }
+
+  .mdc-text-field--filled {
+    background-color: #2a2a2a !important;
+  }
+
+  .mat-mdc-input-element {
+    color: var(--text-color) !important;
+    caret-color: var(--text-color);
+  }
+
+  .mat-mdc-form-field-label {
+    color: var(--text-secondary) !important;
+  }
+
+  .mat-mdc-floating-label {
+    color: var(--text-secondary) !important;
+  }
+
+  .mdc-floating-label {
+    color: var(--text-secondary) !important;
+  }
+
+  /* Material Slide Toggle */
+  .mat-mdc-slide-toggle {
+    color: var(--text-color);
+
+    .mdc-switch__track {
+      background-color: #424242 !important;
+      border-color: #424242 !important;
+    }
+
+    .mdc-switch--selected .mdc-switch__track {
+      background-color: #3f51b5 !important;
+      border-color: #3f51b5 !important;
+    }
+  }
+
+  /* Material Autocomplete */
+  .mat-mdc-autocomplete-panel {
+    background-color: #2a2a2a !important;
+    color: var(--text-color);
+  }
+
+  .mat-mdc-option {
+    color: var(--text-color) !important;
+
+    &:hover {
+      background-color: rgba(255, 255, 255, 0.08) !important;
+    }
+
+    &.mat-mdc-option-active {
+      background-color: rgba(255, 255, 255, 0.08) !important;
+    }
+  }
+
+  /* Material Table */
+  .mat-mdc-table {
+    background-color: var(--card-background);
+    color: var(--text-color);
+  }
+
+  .mat-mdc-header-cell {
+    color: var(--text-color);
+  }
+
+  .mat-mdc-cell {
+    color: var(--text-color);
+  }
+
+  /* Material Buttons */
+  .mat-mdc-raised-button, .mat-mdc-stroked-button, .mat-mdc-button {
+    color: var(--text-color);
+  }
+
+  .mat-mdc-stroked-button {
+    border-color: var(--border-color);
+  }
+
+  /* Material Icon Colors */
+  .mat-icon {
+    color: var(--text-color);
+  }
+
+  /* Card Titles and Content */
+  .mat-mdc-card-title {
+    color: var(--text-color) !important;
+  }
+
+  .mat-mdc-card-content {
+    color: var(--text-color) !important;
+  }
+
+  mat-card-title {
+    color: var(--text-color) !important;
+    border-bottom-color: rgba(255, 255, 255, 0.12) !important;
+  }
+
+  mat-card-content {
+    color: var(--text-color) !important;
+  }
+
+  /* Dark theme border for card titles */
+  mat-card mat-card-title {
+    border-bottom-color: rgba(255, 255, 255, 0.12) !important;
+  }
+
+  /* Slide Toggle Label */
+  .mat-mdc-slide-toggle-label {
+    color: var(--text-color) !important;
+  }
+
+  .mdc-label {
+    color: var(--text-color) !important;
+  }
+
+  /* Button Text */
+  .mat-mdc-button, .mat-mdc-stroked-button, .mat-mdc-raised-button {
+    color: var(--text-color) !important;
+
+    .mdc-button__label {
+      color: var(--text-color) !important;
+    }
+  }
+
+  .mat-mdc-stroked-button {
+    border-color: rgba(255, 255, 255, 0.3) !important;
+
+    &:hover {
+      background-color: rgba(255, 255, 255, 0.08) !important;
+      border-color: rgba(255, 255, 255, 0.5) !important;
+    }
+  }
+
+  .mat-mdc-button.mat-primary {
+    color: #90caf9 !important;
+  }
+
+  /* Links */
+  a {
+    color: #90caf9;
+
+    &:hover {
+      color: #64b5f6;
+    }
+  }
+
+  /* Specific styling for icon picker */
+  .icon-browse-link a {
+    color: #90caf9 !important;
+
+    mat-icon {
+      color: #90caf9 !important;
+    }
+  }
+
+  .icon-preview {
+    background-color: #2a2a2a !important;
+    color: var(--text-color) !important;
+
+    .preview-label {
+      color: var(--text-secondary) !important;
+    }
+  }
+
+  /* Icon category in autocomplete */
+  .icon-category {
+    color: var(--text-secondary) !important;
+  }
+
+  .icon-option-text {
+    color: var(--text-color) !important;
+  }
+}
+
+/* Global Body Styling */
+body {
+  margin: 0;
+  padding: 0;
+  background-color: var(--background-color);
+  color: var(--text-color);
+  font-family: Roboto, "Helvetica Neue", sans-serif;
+  transition: background-color 0.3s ease, color 0.3s ease;
+}