[DevXP] Improve Linaria pre-build speed (#18382)

## Summary

This PR improves Linaria/WYW pre-build speed and continues the migration
of `twenty-ui` components away from runtime `ThemeContext` reads toward
static CSS variables and theme constants.

### Linaria/WYW profiling plugin improvements (`twenty-shared`)

- **Babel JIT warmup**: added a `buildStart` warmup step that triggers
WYW's Babel JIT compilation before the real build starts, so the first
real file doesn't pay the cold-start penalty
- **`configResolved` hook**: detects dev vs prod mode and resolves the
correct warmup file path relative to `config.root`
- **Dev-only per-file logging**: slow file warnings are now gated behind
`isDevMode`, keeping production/CI build output clean
- **`closeBundle` summary**: moved the final top-slow-files report to
`closeBundle` for accurate end-of-build reporting
- **Removed noisy progress interval logging** in favor of the warmup log
+ final summary

### Migration from `ThemeContext` to static CSS variables / constants

Across `twenty-ui`, replaced runtime `useTheme()` reads with:
- `themeCssVariables` CSS custom properties (colors, spacing)
- Hard-coded design-system constants (`ICON.size.md` → `16`,
`ICON.stroke.sm` → `1.6`) so components no longer need a React context
at render time — enabling Linaria static extraction

**Components migrated:**
- `Button`, `AnimatedButton`, `LightButton`, `LightIconButton`,
`AnimatedLightIconButton`, `ButtonIcon`, `ButtonSoon`
- `ProgressBar` (Framer Motion width animation → CSS `transition`)
- `Info`, `HorizontalSeparator`, `LinkChip`
- `MenuPicker`, `MenuItemLeftContent`, `MenuItemIconWithGripSwap`,
`NavigationBarItem`
- `JsonArrow`, `JsonNestedNode`
- `ModalHeader`

### Other
- Added `aria-valuenow` to `ProgressBar` for accessibility
- `VisibilityHidden` component updated to inline accessibility styles

packages/twenty-front/src/modules/settings/data-model/fields/preview/components/SettingsDataModelFieldPreview.tsx

@@ -1,4 +1,3 @@
-import { useContext } from 'react';
 import { styled } from '@linaria/react';
 
 import { useLabelIdentifierFieldMetadataItem } from '@/object-metadata/hooks/useLabelIdentifierFieldMetadataItem';
@@ -13,8 +12,11 @@ import { SettingsDataModelSetFieldValueEffect } from '@/settings/data-model/fiel
 import { SettingsDataModelSetLabelIdentifierRecordEffect } from '@/settings/data-model/fields/preview/components/SettingsDataModelSetLabelIdentifierRecordEffect';
 import { useFieldPreviewValue } from '@/settings/data-model/fields/preview/hooks/useFieldPreviewValue';
 import { useIcons } from 'twenty-ui/display';
-import { ThemeContext } from 'twenty-ui/theme';
-import { themeCssVariables } from 'twenty-ui/theme-constants';
+import {
+  ICON_SIZES,
+  ICON_STROKES,
+  themeCssVariables,
+} from 'twenty-ui/theme-constants';
 import { FieldMetadataType } from '~/generated-metadata/graphql';
 
 type SettingsDataModelFieldPreviewProps = {
@@ -59,7 +61,6 @@ export const SettingsDataModelFieldPreview = ({
   shrink,
   withFieldLabel = true,
 }: SettingsDataModelFieldPreviewProps) => {
-  const { theme } = useContext(ThemeContext);
   const { labelIdentifierFieldMetadataItem } =
     useLabelIdentifierFieldMetadataItem({
       objectNameSingular: objectNameSingular,
@@ -114,10 +115,7 @@ export const SettingsDataModelFieldPreview = ({
           <StyledFieldPreview shrink={shrink}>
             {!!withFieldLabel && (
               <StyledFieldLabel>
-                <FieldIcon
-                  size={theme.icon.size.md}
-                  stroke={theme.icon.stroke.sm}
-                />
+                <FieldIcon size={ICON_SIZES.md} stroke={ICON_STROKES.sm} />
                 {fieldMetadataItem.label}:
               </StyledFieldLabel>
             )}