fix(frontend): retirer l'import vi inutilisé du test de la key bar (#69)

`npm run build` est `tsc --noEmit && vite build` : un import non utilisé
casse le build (TS6133), pas seulement le lint.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/features/web/TerminalKeyBar.test.tsx

@@ -5,7 +5,7 @@
  * the chips emit the exact byte sequences a physical key would, and tapping one
  * never steals focus from xterm (which would collapse the virtual keyboard).
  */
-import { describe, it, expect, vi } from "vitest";
+import { describe, it, expect } from "vitest";
 import { fireEvent, render, screen } from "@testing-library/react";
 
 import type { TerminalInputApi } from "@/features/terminals";