Better cursor rules (#10431)

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

.cursor/rules/react-state-management-guidelines.md

@@ -0,0 +1,219 @@
+# State Management Guidelines
+
+## Core State Management Principles
+Twenty uses a combination of Recoil for global state and Apollo Client for server state management. This document outlines our state management conventions and best practices.
+
+## Global State Management
+
+### Recoil Usage
+- Use Recoil for global application state
+- Keep atoms small and focused
+  ```typescript
+  // ✅ Correct
+  // states/theme.ts
+  export const themeState = atom<'light' | 'dark'>({
+    key: 'themeState',
+    default: 'light',
+  });
+
+  // states/user.ts
+  export const userState = atom<User | null>({
+    key: 'userState',
+    default: null,
+  });
+
+  // ❌ Incorrect
+  // states/globalState.ts
+  export const globalState = atom({
+    key: 'globalState',
+    default: {
+      theme: 'light',
+      user: null,
+      settings: {},
+      // ... many other unrelated pieces of state
+    },
+  });
+  ```
+
+### Atom Organization
+- Place atoms in the `states/` directory
+- Group related atoms in feature-specific files
+  ```typescript
+  // states/workspace/atoms.ts
+  export const workspaceIdState = atom<string>({
+    key: 'workspaceIdState',
+    default: '',
+  });
+
+  export const workspaceSettingsState = atom<WorkspaceSettings>({
+    key: 'workspaceSettingsState',
+    default: defaultSettings,
+  });
+  ```
+
+## Server State Management
+
+### Apollo Client Usage
+- Use Apollo Client for all GraphQL operations
+- Leverage Apollo's caching capabilities
+  ```typescript
+  // ✅ Correct
+  const { data, loading } = useQuery(GET_USER_QUERY, {
+    variables: { id },
+    fetchPolicy: 'cache-first',
+  });
+
+  // ❌ Incorrect
+  const [user, setUser] = useState(null);
+  useEffect(() => {
+    fetch('/api/user/' + id).then(setUser);
+  }, [id]);
+  ```
+
+### Query Organization
+- Separate operation files
+- Use fragments for shared fields
+  ```typescript
+  // queries/user.ts
+  export const UserFragment = gql`
+    fragment UserFields on User {
+      id
+      name
+      email
+    }
+  `;
+
+  export const GET_USER = gql`
+    query GetUser($id: ID!) {
+      user(id: $id) {
+        ...UserFields
+      }
+    }
+    ${UserFragment}
+  `;
+  ```
+
+## State Management Best Practices
+
+### Multiple Small Atoms
+- Prefer multiple small atoms over prop drilling
+- Keep atoms focused on specific features
+  ```typescript
+  // ✅ Correct
+  export const selectedViewState = atom<string>({
+    key: 'selectedViewState',
+    default: '',
+  });
+
+  export const viewFiltersState = atom<ViewFilters>({
+    key: 'viewFiltersState',
+    default: {},
+  });
+
+  // ❌ Incorrect - Prop drilling
+  const ViewContainer = ({ selectedView, filters, onViewChange }) => {
+    return (
+      <ViewHeader view={selectedView} onViewChange={onViewChange}>
+        <ViewContent>
+          <ViewFilters filters={filters} />
+        </ViewContent>
+      </ViewHeader>
+    );
+  };
+  ```
+
+### No useRef for State
+- Never use useRef for state management
+- Use proper state management tools
+  ```typescript
+  // ✅ Correct
+  const [count, setCount] = useState(0);
+  // or
+  const [count, setCount] = useRecoilState(countState);
+
+  // ❌ Incorrect
+  const countRef = useRef(0);
+  ```
+
+### Data Fetching
+- Extract data fetching to sibling components
+- Keep components focused on presentation
+  ```typescript
+  // ✅ Correct
+  const UserProfileContainer = () => {
+    const { data, loading } = useQuery(GET_USER);
+    if (loading) return <LoadingSpinner />;
+    return <UserProfile user={data.user} />;
+  };
+
+  const UserProfile = ({ user }: UserProfileProps) => {
+    return <div>{user.name}</div>;
+  };
+
+  // ❌ Incorrect
+  const UserProfile = () => {
+    const { data, loading } = useQuery(GET_USER);
+    if (loading) return <LoadingSpinner />;
+    return <div>{data.user.name}</div>;
+  };
+  ```
+
+### Hook Usage
+- Use appropriate hooks for state access
+- Choose between useRecoilValue and useRecoilState based on needs
+  ```typescript
+  // ✅ Correct - Read-only access
+  const theme = useRecoilValue(themeState);
+
+  // ✅ Correct - Read-write access
+  const [theme, setTheme] = useRecoilState(themeState);
+
+  // ❌ Incorrect - Using state setter when only reading
+  const [theme, _] = useRecoilState(themeState);
+  ```
+
+## Performance Considerations
+
+### Selector Usage
+- Use selectors for derived state
+- Memoize complex calculations
+  ```typescript
+  // ✅ Correct
+  const filteredUsersState = selector({
+    key: 'filteredUsersState',
+    get: ({ get }) => {
+      const users = get(usersState);
+      const filter = get(userFilterState);
+      return users.filter(user => 
+        user.name.toLowerCase().includes(filter.toLowerCase())
+      );
+    },
+  });
+
+  // ❌ Incorrect - Calculating in component
+  const UserList = () => {
+    const users = useRecoilValue(usersState);
+    const filter = useRecoilValue(userFilterState);
+    const filteredUsers = users.filter(user =>
+      user.name.toLowerCase().includes(filter.toLowerCase())
+    );
+    return <List users={filteredUsers} />;
+  };
+  ```
+
+### Cache Management
+- Configure appropriate cache policies
+- Handle cache invalidation properly
+  ```typescript
+  // ✅ Correct
+  const [updateUser] = useMutation(UPDATE_USER, {
+    update: (cache, { data }) => {
+      cache.modify({
+        id: cache.identify(data.updateUser),
+        fields: {
+          name: () => data.updateUser.name,
+        },
+      });
+    },
+  });
+  ```