feat: redesign shared form dialog — header, styled fields, actions

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/app/shared/form-dialog/form-dialog.component.ts

@@ -22,6 +22,7 @@ import { FormfieldBase } from './formfield/model/formfield-base';
 import { FormGroupService } from './form-group.service';
 import { CdkScrollable } from '@angular/cdk/scrolling';
 import { NgClass } from '@angular/common';
+import { MatIconButton } from '@angular/material/button';
 import { FormfieldComponent } from './formfield/formfield.component';
 import { STANDALONE_SHARED_IMPORTS } from 'app/standalone-shared.module';
 
@@ -39,7 +40,8 @@ const layoutGap = 2;
     NgClass,
     FormfieldComponent,
     MatDialogActions,
-    MatDialogClose
+    MatDialogClose,
+    MatIconButton
   ]
 })
 export class FormDialogComponent implements OnInit {