Better cursor rules (#10431)

Move to the new cursor rule folder style and make it more granular

.cursor/rules/react-general-guidelines.md

@@ -0,0 +1,220 @@
+# React Guidelines
+
+## Core React Principles
+Twenty follows modern React best practices with a focus on functional components and clean, maintainable code. This document outlines our React conventions and best practices.
+
+## Component Structure
+
+### Functional Components Only
+- Use functional components exclusively
+- No class components allowed
+  ```typescript
+  // ✅ Correct
+  export const UserProfile = ({ user }: UserProfileProps) => {
+    return (
+      <StyledContainer>
+        <h1>{user.name}</h1>
+      </StyledContainer>
+    );
+  };
+
+  // ❌ Incorrect
+  export class UserProfile extends React.Component<UserProfileProps> {
+    render() {
+      return (
+        <StyledContainer>
+          <h1>{this.props.user.name}</h1>
+        </StyledContainer>
+      );
+    }
+  }
+  ```
+
+### Named Exports
+- Use named exports exclusively
+- No default exports
+  ```typescript
+  // ✅ Correct
+  export const Button = ({ label }: ButtonProps) => {
+    return <button>{label}</button>;
+  };
+
+  // ❌ Incorrect
+  export default function Button({ label }: ButtonProps) {
+    return <button>{label}</button>;
+  }
+  ```
+
+## State and Effects
+
+### Event Handlers Over useEffect
+- Prefer event handlers for state updates
+- Avoid useEffect for state synchronization
+  ```typescript
+  // ✅ Correct
+  const UserForm = () => {
+    const handleSubmit = async (data: FormData) => {
+      await updateUser(data);
+      refreshUserList();
+    };
+
+    return <Form onSubmit={handleSubmit} />;
+  };
+
+  // ❌ Incorrect
+  const UserForm = () => {
+    useEffect(() => {
+      if (formData) {
+        updateUser(formData);
+      }
+    }, [formData]);
+
+    return <Form />;
+  };
+  ```
+
+## Component Design
+
+### Small, Focused Components
+- Keep components small and single-purpose
+- Extract reusable logic into custom hooks
+  ```typescript
+  // ✅ Correct
+  const UserCard = ({ user }: UserCardProps) => {
+    return (
+      <StyledCard>
+        <UserAvatar user={user} />
+        <UserInfo user={user} />
+        <UserActions user={user} />
+      </StyledCard>
+    );
+  };
+
+  // ❌ Incorrect
+  const UserCard = ({ user }: UserCardProps) => {
+    return (
+      <StyledCard>
+        {/* Too much logic in one component */}
+        <img src={user.avatar} />
+        <div>{user.name}</div>
+        <div>{user.email}</div>
+        <button onClick={() => handleEdit(user)}>Edit</button>
+        <button onClick={() => handleDelete(user)}>Delete</button>
+        {/* More complex logic... */}
+      </StyledCard>
+    );
+  };
+  ```
+
+## Props
+
+### Prop Naming
+- Use clear, descriptive prop names
+- Follow React conventions (onClick, isActive, etc.)
+  ```typescript
+  // ✅ Correct
+  type ButtonProps = {
+    onClick: () => void;
+    isDisabled?: boolean;
+    isLoading?: boolean;
+  };
+
+  // ❌ Incorrect
+  type ButtonProps = {
+    clickHandler: () => void;
+    disabled?: boolean;
+    loading?: boolean;
+  };
+  ```
+
+### Prop Destructuring
+- Destructure props with proper typing
+- Use TypeScript for prop types
+  ```typescript
+  // ✅ Correct
+  const Button = ({ onClick, isDisabled, children }: ButtonProps) => {
+    return (
+      <button onClick={onClick} disabled={isDisabled}>
+        {children}
+      </button>
+    );
+  };
+
+  // ❌ Incorrect
+  const Button = (props: ButtonProps) => {
+    return (
+      <button onClick={props.onClick} disabled={props.isDisabled}>
+        {props.children}
+      </button>
+    );
+  };
+  ```
+
+## Performance Optimization
+
+### Memoization
+- Use memo for expensive computations
+- Avoid premature optimization
+  ```typescript
+  // ✅ Correct - Complex computation
+  const MemoizedChart = memo(({ data }: ChartProps) => {
+    // Complex rendering logic
+    return <ComplexChart data={data} />;
+  });
+
+  // ❌ Incorrect - Unnecessary memoization
+  const MemoizedText = memo(({ text }: { text: string }) => {
+    return <span>{text}</span>;
+  });
+  ```
+
+### Event Handlers
+- Use callback refs for DOM manipulation
+- Memoize callbacks when needed
+  ```typescript
+  // ✅ Correct
+  const UserList = () => {
+    const handleScroll = useCallback((event: UIEvent) => {
+      // Complex scroll handling
+    }, []);
+
+    return <div onScroll={handleScroll}>{/* content */}</div>;
+  };
+  ```
+
+## Error Handling
+
+### Error Boundaries
+- Use error boundaries for component error handling
+- Provide meaningful fallback UIs
+  ```typescript
+  // ✅ Correct
+  const ErrorFallback = ({ error }: { error: Error }) => (
+    <StyledError>
+      <h2>Something went wrong</h2>
+      <pre>{error.message}</pre>
+    </StyledError>
+  );
+
+  const SafeComponent = () => (
+    <ErrorBoundary FallbackComponent={ErrorFallback}>
+      <ComponentThatMightError />
+    </ErrorBoundary>
+  );
+  ```
+
+### Loading States
+- Handle loading states gracefully
+- Provide meaningful loading indicators
+  ```typescript
+  // ✅ Correct
+  const UserProfile = () => {
+    const { data: user, isLoading, error } = useUser();
+
+    if (isLoading) return <LoadingSpinner />;
+    if (error) return <ErrorMessage error={error} />;
+    if (!user) return <NotFound />;
+
+    return <UserProfileContent user={user} />;
+  };
+  ```