fix(shell): add missing useI18n import

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Assisted-by: GLM-5.1 via Crush <crush@charm.land>

web/src/components/Shell.jsx

@@ -1,4 +1,5 @@
 import { useState, useRef, useEffect, useCallback } from 'react'
+import { useI18n } from '../i18n'
 // === Style thème système pour xterm ===
 function getCSSVariable(varName) {
   if (typeof document === 'undefined') return null;