feat: add resizable navigation drawer and command menu panels (#16612)

## Summary

Adds Notion-style resizable panels for the navigation drawer (left
sidebar) and command menu (right panel).

## Behavior

- **Hover** at panel edge → resize cursor appears
- **Click** → collapse/close the panel
- **Drag** → resize the panel (5px movement threshold to distinguish
from click)

## Constraints

| Panel | Min | Max | Default | Collapse Threshold |
|-------|-----|-----|---------|-------------------|
| Navigation Drawer | 180px | 350px | 220px | 150px |
| Command Menu | 320px | 600px | 400px | 250px |

## Performance Optimizations

- **CSS variables** for smooth 60fps resize (no React re-renders during
drag)
- **Table resize observer disabled** during panel resize to prevent
expensive recalculations
- **React.memo wrapper** on page body to prevent unnecessary re-renders

## Architecture

- `useResizablePanel` hook following the same pattern as
`useResizeTableHeader`
- `ResizablePanelEdge` - resize handle positioned at panel edge
- `ResizablePanelGap` - resize handle in the gap between panels
- `cssVariableEffect` - Recoil effect to sync CSS variables with state

## Refactoring

- Split `recoil-effects.ts` into separate files in `utils/recoil/` (one
export per file)
- Persist panel widths to localStorage via existing `localStorageEffect`

packages/twenty-front/src/loading/components/UserOrMetadataLoader.tsx

@@ -2,7 +2,7 @@ import styled from '@emotion/styled';
 
 import { useShowAuthModal } from '@/ui/layout/hooks/useShowAuthModal';
 import { Modal } from '@/ui/layout/modal/components/Modal';
-import { NAV_DRAWER_WIDTHS } from '@/ui/navigation/navigation-drawer/constants/NavDrawerWidths';
+import { NAVIGATION_DRAWER_CONSTRAINTS } from '@/ui/layout/resizable-panel/constants/NavigationDrawerConstraints';
 import { MOBILE_VIEWPORT } from 'twenty-ui/theme';
 import { LeftPanelSkeletonLoader } from '~/loading/components/LeftPanelSkeletonLoader';
 import { RightPanelSkeletonLoader } from '~/loading/components/RightPanelSkeletonLoader';
@@ -14,7 +14,7 @@ const StyledContainer = styled.div`
   flex-direction: row;
   gap: 12px;
   height: 100dvh;
-  min-width: ${NAV_DRAWER_WIDTHS.menu.desktop.expanded}px;
+  min-width: ${NAVIGATION_DRAWER_CONSTRAINTS.default}px;
   width: 100%;
   padding: 12px 8px 12px 8px;
   overflow: hidden;