[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/app/effect-components/PageChangeEffect.tsx

@@ -18,7 +18,6 @@ import { isCaptchaScriptLoadedState } from '@/captcha/states/isCaptchaScriptLoad
 import { isCaptchaRequiredForPath } from '@/captcha/utils/isCaptchaRequiredForPath';
 import { useCommandMenu } from '@/command-menu/hooks/useCommandMenu';
 import { commandMenuPageState } from '@/command-menu/states/commandMenuPageState';
-import { CommandMenuPages } from '@/command-menu/types/CommandMenuPages';
 import { MAIN_CONTEXT_STORE_INSTANCE_ID } from '@/context-store/constants/MainContextStoreInstanceId';
 import { contextStoreCurrentViewIdComponentState } from '@/context-store/states/contextStoreCurrentViewIdComponentState';
 import { contextStoreCurrentViewTypeComponentState } from '@/context-store/states/contextStoreCurrentViewTypeComponentState';
@@ -37,7 +36,7 @@ import { PageFocusId } from '@/types/PageFocusId';
 import { useResetFocusStackToFocusItem } from '@/ui/utilities/focus/hooks/useResetFocusStackToFocusItem';
 import { FocusComponentType } from '@/ui/utilities/focus/types/FocusComponentType';
 import { useRecoilComponentValue } from '@/ui/utilities/state/component-state/hooks/useRecoilComponentValue';
-import { AppBasePath, AppPath } from 'twenty-shared/types';
+import { AppBasePath, AppPath, CommandMenuPages } from 'twenty-shared/types';
 import { isDefined } from 'twenty-shared/utils';
 import { AnalyticsType } from '~/generated-metadata/graphql';
 import { usePageChangeEffectNavigateLocation } from '~/hooks/usePageChangeEffectNavigateLocation';