feat: Implement tasks feature using NGRX signals and remove the old counter store, alongside general project configuration and skill documentation updates.

src/app/features/tasks/data-access/task.model.ts

@@ -0,0 +1,10 @@
+export type TaskPriority = 'low' | 'medium' | 'high';
+export type TaskFilter = 'all' | 'active' | 'completed';
+
+export interface Task {
+    id: string;
+    title: string;
+    completed: boolean;
+    priority: TaskPriority;
+    updatedAt: string;
+}