Task/improve type safety in rule settings dialog component (#7185)

* fix(client): resolve type errors

* feat(client): enforce encapsulation

* feat(client): enforce immutability

* feat(client): replace constructor based DI with inject functions

apps/client/src/app/components/rule/rule-settings-dialog/rule-settings-dialog.component.ts

@@ -1,6 +1,6 @@
 import { GfValueComponent } from '@ghostfolio/ui/value';
 
-import { ChangeDetectionStrategy, Component, Inject } from '@angular/core';
+import { ChangeDetectionStrategy, Component, inject } from '@angular/core';
 import { FormBuilder, FormGroup, ReactiveFormsModule } from '@angular/forms';
 import { MatButtonModule } from '@angular/material/button';
 import {
@@ -26,20 +26,21 @@ import { RuleSettingsDialogParams } from './interfaces/interfaces';
   templateUrl: './rule-settings-dialog.html'
 })
 export class GfRuleSettingsDialogComponent {
-  public settingsForm: FormGroup;
+  protected readonly settingsForm: FormGroup;
 
-  public constructor(
-    @Inject(MAT_DIALOG_DATA) public data: RuleSettingsDialogParams,
-    public dialogRef: MatDialogRef<GfRuleSettingsDialogComponent>,
-    private formBuilder: FormBuilder
-  ) {
+  protected readonly data = inject<RuleSettingsDialogParams>(MAT_DIALOG_DATA);
+  protected readonly dialogRef =
+    inject<MatDialogRef<GfRuleSettingsDialogComponent>>(MatDialogRef);
+  private readonly formBuilder = inject(FormBuilder);
+
+  public constructor() {
     this.settingsForm = this.formBuilder.group({
-      thresholdMax: [this.data.settings.thresholdMax],
-      thresholdMin: [this.data.settings.thresholdMin]
+      thresholdMax: [this.data.settings?.thresholdMax],
+      thresholdMin: [this.data.settings?.thresholdMin]
     });
   }
 
-  public onSubmit() {
+  protected onSubmit() {
     this.dialogRef.close({
       ...this.data.settings,
       thresholdMax: this.settingsForm.get('thresholdMax')?.value,