chore(twenty-front): migrate command-menu, workflow, page-layout and UI modules from Emotion to Linaria (PR 4-6/10) (#18342)

## Summary

Continues the Emotion → Linaria migration (PR 4-6 from the [migration
plan](docs/emotion-to-linaria-migration-plan.md)). Migrates **311
files** across four module groups:

| Module | Files |
|---|---|
| command-menu | 53 |
| workflow | 84 |
| page-layout | 84 |
| UI (partial - first ~80 files) | ~80 |
| twenty-ui (TEXT_INPUT_STYLE) | 1 |
| misc (hooks, keyboard-shortcut-menu, file-upload) | ~9 |

### Migration patterns applied

- `import styled from '@emotion/styled'` → `import { styled } from
'@linaria/react'`
- `import { useTheme } from '@emotion/react'` → `import { useContext }
from 'react'` + `import { ThemeContext } from 'twenty-ui/theme'`
- `${({ theme }) => theme.X.Y.Z}` → `${themeCssVariables.X.Y.Z}` (static
CSS variables)
- `theme.spacing(N)` → `themeCssVariables.spacing[N]`
- `styled(motion.div)` → `motion.create(StyledBase)` (11 components)
- `styled(Component)<TypeParams>` → wrapper div approach for non-HTML
elements
- Multi-declaration interpolations split into one CSS property per
interpolation
- Interpolation return types fixed (`&&` → ternary `? : ''`)
- `TEXT_INPUT_STYLE` converted from function to static string constant
(backward compatible)
- Emotion `<Global>` replaced with `useEffect` style injection
- Complex runtime-dependent styles use CSS custom properties via
`style={}` prop

### After this PR

- **Remaining files**: ~400 (object-record: ~160, settings: ~200, UI:
~44)
- **No breaking changes**: CSS variables resolve identically to the
previous Emotion theme values

packages/twenty-front/src/modules/ui/input/components/MultiSelectControl.tsx

@@ -1,15 +1,27 @@
 import {
   type SelectControlProps,
   StyledControlContainer,
-  StyledSelectControlIconChevronDown,
 } from '@/ui/input/components/SelectControl';
-import { useTheme } from '@emotion/react';
-import React from 'react';
+import { styled } from '@linaria/react';
+import React, { useContext } from 'react';
 import { isDefined } from 'twenty-shared/utils';
 import {
+  IconChevronDown,
   type IconComponent,
   OverflowingTextWithTooltip,
 } from 'twenty-ui/display';
+import { ThemeContext } from 'twenty-ui/theme';
+import { themeCssVariables } from 'twenty-ui/theme-constants';
+
+const StyledIconChevronDownWrapper = styled.div<{
+  disabled?: boolean;
+}>`
+  color: ${({ disabled }) =>
+    disabled
+      ? themeCssVariables.font.color.extraLight
+      : themeCssVariables.font.color.tertiary};
+  display: flex;
+`;
 
 type MultiSelectOptionType = {
   label: string;
@@ -31,7 +43,7 @@ export const MultiSelectControl = ({
   textAccent = 'default',
   hasRightElement,
 }: MultiSelectControlProps) => {
-  const theme = useTheme();
+  const { theme } = useContext(ThemeContext);
 
   const firstSelectedOption = selectedOptions?.[0];
   return (
@@ -61,10 +73,9 @@ export const MultiSelectControl = ({
         <OverflowingTextWithTooltip text={firstSelectedOption?.label ?? ''} />
       )}
 
-      <StyledSelectControlIconChevronDown
-        disabled={isDisabled}
-        size={theme.icon.size.md}
-      />
+      <StyledIconChevronDownWrapper disabled={isDisabled}>
+        <IconChevronDown size={theme.icon.size.md} />
+      </StyledIconChevronDownWrapper>
     </StyledControlContainer>
   );
 };