fix(build): resolve type errors blocking production build

- agenda-create-form: capture prefilled patient name in const so the
  async closure sees a narrowed string type
- tsconfig: exclude tests/ from next build typecheck (Cypress/Playwright
  files have their own type context)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tsconfig.json

@@ -38,6 +38,7 @@
   ],
   "exclude": [
     "node_modules",
-    "app/epd/_archive/**/*"
+    "app/epd/_archive/**/*",
+    "tests/**/*"
   ]
 }