fix: update Angular CLI version and refactor dialog component template

- Updated @angular/cli from version ~20.0.3 to ~20.3.6 in package.json.
- Refactored dialog.component.html to remove optional chaining from ngModel bindings for event properties.

theme/packages/main/package.json

@@ -46,7 +46,7 @@
   },
   "devDependencies": {
     "@angular/build": "^20.0.3",
-    "@angular/cli": "~20.0.3",
+    "@angular/cli": "~20.3.6",
     "@angular/compiler-cli": "^20.0.4",
     "@types/chance": "^1.1.6",
     "@types/date-fns": "^2.6.3",