refactor: migrate testing framework from Karma/Jasmine to Vitest with Angular support

src/app/components/rules-panel/rules-panel.ts

@@ -1,4 +1,4 @@
-import { Component, ChangeDetectionStrategy, inject, signal } from '@angular/core';
+import { Component, ChangeDetectionStrategy, inject, signal, Injectable } from '@angular/core';
 import {
 	RuleService,
 	RuleType,
@@ -26,6 +26,7 @@ import {
 } from '@angular/material/core';
 import { CdkDragDrop, CdkDropList, CdkDrag } from '@angular/cdk/drag-drop';
 
+@Injectable()
 class CustomDateAdapter extends NativeDateAdapter {
 	override format(date: Date, displayFormat: unknown): string {
 		if (displayFormat === 'input') {