Replace deprecated Angular directives (*ngFor, *ngIf) with modern Angular template syntax. Remove unused CommonModule imports across components for optimization. Clean up excess spacing and formatting in HTML files.

frontend/package.json

@@ -14,14 +14,14 @@
   "private": true,
   "dependencies": {
     "@angular/cdk": "^19.2.18",
-    "@angular/common": "^19.2.0",
-    "@angular/compiler": "^19.2.0",
-    "@angular/core": "^19.2.0",
-    "@angular/forms": "^19.2.0",
+    "@angular/common": "^20.1.0",
+    "@angular/compiler": "^20.1.0",
+    "@angular/core": "^20.1.0",
+    "@angular/forms": "^20.1.0",
     "@angular/material": "^19.2.19",
-    "@angular/platform-browser": "^19.2.0",
-    "@angular/platform-browser-dynamic": "^19.2.0",
-    "@angular/router": "^19.2.0",
+    "@angular/platform-browser": "^20.1.0",
+    "@angular/platform-browser-dynamic": "^20.1.0",
+    "@angular/router": "^20.1.0",
     "@auth0/angular-jwt": "^5.2.0",
     "@types/three": "^0.177.0",
     "ngx-cookie-service": "^19.1.2",
@@ -31,9 +31,9 @@
     "zone.js": "~0.15.0"
   },
   "devDependencies": {
-    "@angular-devkit/build-angular": "^19.2.5",
-    "@angular/cli": "^19.2.5",
-    "@angular/compiler-cli": "^19.2.0",
+    "@angular/build": "^20.1.0",
+    "@angular/cli": "^20.1.0",
+    "@angular/compiler-cli": "^20.1.0",
     "@types/jasmine": "~5.1.0",
     "jasmine-core": "~5.6.0",
     "karma": "~6.4.0",
@@ -43,4 +43,4 @@
     "karma-jasmine-html-reporter": "~2.1.0",
     "typescript": "^5.8.3"
   }
-}
+}