test(web): add 57 UI component and hook tests with jsdom cleanup

Fix jsdom environment: add esbuild automatic JSX transform and
afterEach cleanup to prevent DOM leakage between tests.

Components: Badge (8), Button (13), FilterBar (5), EmptyState (8),
ConfirmDialog (8), useSelection hook (15).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/web/vitest.config.mts

@@ -2,6 +2,9 @@ import path from "node:path";
 import { defineConfig } from "vitest/config";
 
 export default defineConfig({
+  esbuild: {
+    jsx: "automatic",
+  },
   resolve: {
     alias: {
       "~": path.resolve(__dirname, "./src"),