feat(ui): replace code button text label with CodeSimpleIcon

- add CodeSimpleIcon svg to shared icons index
- update inline toolbar code button to use CodeSimpleIcon instead of text label

src/shared/components/BlockEditor/inline/Toolbar.client.js

@@ -1,7 +1,7 @@
 'use client';
 
 import React, { useEffect, useLayoutEffect, useRef, useState } from 'react';
-import { TextColorIcon, HighlighterIcon, Link02Icon } from '@zen/core/shared/icons';
+import { TextColorIcon, HighlighterIcon, Link02Icon, CodeSimpleIcon } from '@zen/core/shared/icons';
 import { INLINE_COLORS, INLINE_COLOR_KEYS, markKey } from './types.js';
 
 // Toolbar flottant de formatage. Affiché tant qu'une sélection non-vide
@@ -20,7 +20,7 @@ const SIMPLE_BUTTONS = [
   { type: 'italic', label: 'I', title: 'Italique (Ctrl+I)', className: 'italic' },
   { type: 'underline', label: 'U', title: 'Soulignement (Ctrl+U)', className: 'underline' },
   { type: 'strike', label: 'S', title: 'Barré', className: 'line-through' },
-  { type: 'code', label: '</>', title: 'Code (Ctrl+E)', className: 'font-mono text-[11px]' },
+  { type: 'code', label: <CodeSimpleIcon width={15} height={15} />, title: 'Code (Ctrl+E)', className: '' },
 ];
 
 export default function InlineToolbar({ rect, activeMarks, onToggleMark, onPinChange, usedColors }) {