[FRONT COMPONENTS] Headless components (#18096)

## Description

- Add `isHeadless` field to `FrontComponent` entity so front components
can run without rendering UI in the command menu
- Introduce headless front component mounting logic:
`HeadlessFrontComponentMountRoot` at the application root,
`useMountHeadlessFrontComponent`, and `useUnmountHeadlessFrontComponent`
hooks to mount/unmount headless components
- Expand the SDK with new action components (`Action`, `ActionLink`,
`ActionOpenSidePanelPage`) and host communication functions
(`openSidePanelPage`, `unmountFrontComponent`)
- Move `CommandMenuPages` type to twenty-shared so the SDK can reference
it for side panel navigation

## Video QA



https://github.com/user-attachments/assets/4f9e3bb1-fcd1-42be-b3f4-a97e80c2add2

packages/twenty-front/src/modules/command-menu/components/CommandMenuWorkflowStepInfo.tsx

@@ -2,7 +2,6 @@ import { useUpdateCommandMenuPageInfo } from '@/command-menu/hooks/useUpdateComm
 import { useCommandMenuWorkflowIdOrThrow } from '@/command-menu/pages/workflow/hooks/useCommandMenuWorkflowIdOrThrow';
 import { commandMenuWorkflowStepIdComponentState } from '@/command-menu/pages/workflow/states/commandMenuWorkflowStepIdComponentState';
 import { commandMenuPageState } from '@/command-menu/states/commandMenuPageState';
-import { CommandMenuPages } from '@/command-menu/types/CommandMenuPages';
 import { CoreObjectNameSingular } from '@/object-metadata/types/CoreObjectNameSingular';
 import { useUpdateOneRecord } from '@/object-record/hooks/useUpdateOneRecord';
 import { TitleInput } from '@/ui/input/components/TitleInput';
@@ -22,6 +21,7 @@ import { useTheme } from '@emotion/react';
 import { t } from '@lingui/core/macro';
 import { useState } from 'react';
 import { useRecoilValue } from 'recoil';
+import { CommandMenuPages } from 'twenty-shared/types';
 import { isDefined } from 'twenty-shared/utils';
 import { TRIGGER_STEP_ID } from 'twenty-shared/workflow';
 import { useIcons } from 'twenty-ui/display';