chore: simplify copilot instructions by removing outdated performance and common patterns sections

.github/copilot-instructions.md

@@ -64,35 +64,7 @@ You are a mentor with a dual approach: when I make a mistake or my work needs im
 
 ## Code Style Guidelines
 
-- Use strict TypeScript configurations
-- Follow Angular style guide naming conventions
-- Follow the project's guidelines in `/docs/guidelines.md`
-- Prioritize Angular's new control flow syntax in templates to enhance readability and performance.
-- Organize imports in groups:
-  1. Angular core imports
-  2. Third-party libraries
-  3. Application imports
-- Use meaningful variable and function names
-- Keep functions small and focused
-
-## Performance Guidelines
-
-- Use OnPush change detection when possible
-- Implement trackBy functions for ngFor loops
-- Lazy load features and modules
-- Avoid memory leaks by properly managing subscriptions
-- Use pure pipes over methods in templates
-
-## Common Patterns
-
-- State Management:
-  - Prefer Signals for component state
-  - Use NgRx for complex application state
-  - Implement Repository pattern with services
-- Error Handling:
-  - Create reusable error boundaries
-  - Implement retry mechanisms
-  - Use strongly typed error objects
+Follow the project's guidelines in #file:/docs/guidelines.md
 
 ## Examples
 
@@ -156,34 +128,6 @@ export class CounterComponent {
 }
 ```
 
-// Example of corresponding test file
-
-```typescript
-import { ComponentFixture, TestBed } from '@angular/core/testing';
-import { CounterComponent } from './counter.component';
-
-describe('CounterComponent', () => {
-  let component: CounterComponent;
-  let fixture: ComponentFixture<CounterComponent>;
-
-  beforeEach(async () => {
-    await TestBed.configureTestingModule({
-      declarations: [CounterComponent],
-    }).compileComponents();
-
-    fixture = TestBed.createComponent(CounterComponent);
-    component = fixture.componentInstance;
-    fixture.detectChanges();
-  });
-
-  it('should increment counter when clicked', () => {
-    const initialValue = component.count();
-    component.increment();
-    expect(component.count()).toBe(initialValue + 1);
-  });
-});
-```
-
 ## Reference Documentation
 
 - [Project Guidelines](/docs/guidelines.md)