feat(frontend): bootstrap Vite + React 19 + TS strict toolchain (F0.1)

- Vite 8 / React 19 / TS 6 strict (noUncheckedIndexedAccess, no baseUrl deprecation)
- Tailwind 4 via @tailwindcss/vite (no PostCSS step)
- TanStack Query 5, react-router-dom 7, Recharts, clsx
- Vitest + Testing Library + jsdom for unit tests
- Playwright skeleton + first smoke spec (login redirect)
- ESLint flat config: typescript-eslint type-checked, react-hooks, react-refresh, prettier
- Prettier config (semi, single quotes, 100-col, lf)
- IBM Plex font @font-face declarations targeting /fonts/ (self-host, no CDN — OPSEC)

frontend/e2e/smoke.spec.ts

@@ -0,0 +1,7 @@
+import { test, expect } from '@playwright/test';
+
+test('home redirects to login', async ({ page }) => {
+  await page.goto('/');
+  await expect(page).toHaveURL(/\/login$/);
+  await expect(page.getByRole('heading', { name: /mimic/i })).toBeVisible();
+});