refactor: centralize hotel name fallback via FALLBACK_HOTEL_NAME

Route all user-facing Atom hotel defaults through resolveHotelName (settings then HOTEL_NAME env then brand constant). Exclude Playwright e2e from tsconfig until deps are installed.

Co-authored-by: Cursor <[email protected]>

src/lib/brand.ts

@@ -0,0 +1,10 @@
+/**
+ * Single hardcoded fallback hotel brand.
+ * Override order at runtime:
+ *   1. website_settings.hotel_name
+ *   2. HOTEL_NAME env
+ *   3. this constant
+ *
+ * Safe for client components (no env / DB imports).
+ */
+export const FALLBACK_HOTEL_NAME = "Atom";