Deprecate runtime theme objects in favor of CSS variables (#18402)

## Summary

- **Eliminate `ICON_SIZES` / `ICON_STROKES` constants**: all icon
dimensions are now resolved at runtime via
`resolveThemeVariableAsNumber(themeCssVariables.icon.size.X)`, ensuring
values always come from computed CSS variables
- **No more consumer imports from `twenty-ui/theme`**: moved
`ColorSchemeContext`, `ColorSchemeProvider`, `ThemeColor`,
`MAIN_COLOR_NAMES`, `getNextThemeColor`, `AnimationDuration` to
`twenty-ui/theme-constants`
- **Remove `ThemeContext` / `ThemeContextProvider` / `ThemeProvider` /
`ThemeType`**: replaced across ~300 files with `themeCssVariables` (for
CSS contexts) or `resolveThemeVariable` / `resolveThemeVariableAsNumber`
(for JS runtime values)
- **Simplify provider chain**: only `ColorSchemeProvider` remains — it
toggles `light`/`dark` class on `document.documentElement` and provides
`colorScheme` via React context
- **Fix pre-existing test failures**: `useIcons.test.ts`
(non-configurable ES module spy) and
`turnRecordFilterGroupIntoGqlOperationFilter.test.ts`
(`Omit<RecordFilter, 'id'>` type mismatch)

### Theme access pattern (before → after)

| Context | Before | After |
|---------|--------|-------|
| CSS (Linaria) | `${({ theme }) => theme.font.color.primary}` |
`${themeCssVariables.font.color.primary}` |
| JS runtime (icon size, animation) | `theme.icon.size.md` /
`ICON_SIZES.md` |
`resolveThemeVariableAsNumber(themeCssVariables.icon.size.md)` |
| Color scheme check | `theme.name === 'dark'` |
`useContext(ColorSchemeContext).colorScheme === 'dark'` |

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

@@ -23,9 +23,7 @@ import { motion } from 'framer-motion';
 import { useCallback, useContext, useRef } from 'react';
 import { LINK_CHIP_CLICK_OUTSIDE_ID } from 'twenty-ui/components';
 import { useIsMobile } from 'twenty-ui/utilities';
-import { themeCssVariables } from 'twenty-ui/theme-constants';
-import { ThemeContext } from 'twenty-ui/theme';
-
+import { ThemeContext, themeCssVariables } from 'twenty-ui/theme-constants';
 const StyledCommandMenuBase = styled.div`
   background: ${themeCssVariables.background.primary};
   border-left: 1px solid ${themeCssVariables.border.color.medium};
@@ -46,14 +44,12 @@ const StyledCommandMenu = motion.create(StyledCommandMenuBase);
 export const CommandMenuOpenContainer = ({
   children,
 }: React.PropsWithChildren) => {
+  const { theme } = useContext(ThemeContext);
   const isMobile = useIsMobile();
 
   const targetVariantForAnimation: CommandMenuAnimationVariant = isMobile
     ? 'fullScreen'
     : 'normal';
-
-  const { theme } = useContext(ThemeContext);
-
   const { closeCommandMenu } = useCommandMenu();
 
   const commandMenuRef = useRef<HTMLDivElement>(null);
@@ -100,7 +96,9 @@ export const CommandMenuOpenContainer = ({
       initial="closed"
       exit="closed"
       variants={COMMAND_MENU_ANIMATION_VARIANTS}
-      transition={{ duration: theme.animation.duration.normal }}
+      transition={{
+        duration: theme.animation.duration.normal,
+      }}
       onAnimationStart={() => setIsSidePanelAnimating(true)}
       onAnimationComplete={() => setIsSidePanelAnimating(false)}
     >