Add TypeScript configuration for Playwright tests

Add proper TypeScript setup with tsconfig.json and type definitions
to resolve type errors in the e2e test files.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

tests/tsconfig.json

@@ -0,0 +1,13 @@
+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "module": "commonjs",
+    "lib": ["ES2020", "DOM"],
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "moduleResolution": "node",
+    "noEmit": true
+  },
+  "include": ["e2e/**/*.ts"]
+}