initial commit

web/vitest.config.ts

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+import { defineConfig } from 'vitest/config'
+
+/**
+ * Test configuration, kept separate from vite.config.ts so that the test options
+ * are not part of the production build configuration. The type definitions of the
+ * two tools overlap but are not identical, and mixing them produces confusing
+ * errors about the `test` key.
+ */
+export default defineConfig({
+  test: {
+    // The admin interface is a browser application: components touch the DOM,
+    // localStorage and matchMedia, so jsdom is required rather than merely useful.
+    environment: 'jsdom',
+    globals: true,
+    setupFiles: ['./src/test/setup.ts'],
+    css: false,
+    // Tests live next to what they test.
+    include: ['src/**/*.test.{ts,tsx}'],
+  },
+})