fix: show unfortunately text only for outside Oregon selection

- Changed condition from `city ?` to `city === "other" ?`
- Oregon cities now keep welcome message during loading (no flash)
- Outside Oregon selection shows "Unfortunately..." text immediately
- Fixes issue where all city selections showed unfortunately message

Co-authored-by: Kent Shikama <KentShikama@users.noreply.github.com>

Author: claude[bot]

frontend/src/pages/Chat/components/CitySelectField.tsx

@@ -60,7 +60,7 @@ export default function CitySelectField({ setMessages }: Props) {
   return (
     <div className="flex flex-col gap-2">
       <p className="text-center text-[#888] mb-10">
-        {city
+        {city === "other"
           ? "Unfortunately we can only answer questions about tenant rights in Oregon right now."
           : "Welcome to Tenant First Aid! I can answer your questions about tenant rights in Oregon. To get started, what city are you located in?"}
       </p>