feat: upgrade to Angular 21

Bumps all Angular packages from 20.1.3 to 21.2.8, ng-packagr from
20.1.0 to 21.2.2, and TypeScript from 5.8.3 to 5.9.3 (required by
Angular 21's >=5.9 peer dep). Library peer deps remain at >=17.0.0
for broad backward compatibility.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: mariohmol

package.json

@@ -37,31 +37,31 @@
     "rebuildsass": "npm rebuild node-sass"
   },
   "dependencies": {
-    "@angular/common": "^20.1.3",
-    "@angular/compiler": "^20.1.3",
-    "@angular/core": "^20.1.3",
-    "@angular/forms": "^20.1.3",
-    "@angular/platform-browser": "^20.1.3",
-    "@angular/platform-browser-dynamic": "^20.1.3",
-    "@angular/router": "^20.1.3",
+    "@angular/common": "^21.2.8",
+    "@angular/compiler": "^21.2.8",
+    "@angular/core": "^21.2.8",
+    "@angular/forms": "^21.2.8",
+    "@angular/platform-browser": "^21.2.8",
+    "@angular/platform-browser-dynamic": "^21.2.8",
+    "@angular/router": "^21.2.8",
     "jsoneditor": "*",
-    "ng-packagr": "^20.1.0",
+    "ng-packagr": "^21.2.2",
     "rxjs": "*",
     "tslib": "^2.3.0",
     "webpack": "^5.104.1",
     "zone.js": "~0.15.1"
   },
   "devDependencies": {
-    "@angular-devkit/schematics": "^20.1.3",
+    "@angular-devkit/schematics": "^21.2.7",
     "@angular-eslint/builder": "^18.0.0",
     "@angular-eslint/eslint-plugin": "^18.0.0",
     "@angular-eslint/eslint-plugin-template": "^18.0.0",
     "@angular-eslint/schematics": "^18.0.0",
     "@angular-eslint/template-parser": "^18.0.0",
-    "@angular/build": "^20.1.3",
-    "@angular/cli": "^20.1.3",
-    "@angular/compiler-cli": "^20.1.3",
-    "@angular/language-service": "^20.1.3",
+    "@angular/build": "^21.2.7",
+    "@angular/cli": "^21.2.7",
+    "@angular/compiler-cli": "^21.2.8",
+    "@angular/language-service": "^21.2.8",
     "@types/jasmine": "~5.1.2",
     "@types/jsoneditor": "^9.9.3",
     "@typescript-eslint/eslint-plugin": "^8.0.0",
@@ -77,6 +77,6 @@
     "karma-coverage": "~2.2.0",
     "karma-jasmine": "~5.1.0",
     "karma-jasmine-html-reporter": "~2.1.0",
-    "typescript": "5.8.3"
+    "typescript": "5.9.3"
   }
 }