Feat/BOOK-63 hotel subpages branding

* feat(BOOK-63): Replaced css variables and components to apply hotel branding on subpages
* feat(BOOK-63): Replaced css variables and components to apply hotel branding on hotel page map view

Approved-by: Christel Westerberg
Approved-by: Matilda Landström

packages/common/utils/theme/serverContext.ts

@@ -0,0 +1,31 @@
+import "server-only"
+
+import { cache } from "react"
+
+import { DEFAULT_THEME, type Theme } from "."
+
+const getRef = cache(() => ({ current: DEFAULT_THEME as Theme }))
+
+/**
+ * Set the global theme
+ *
+ * It works kind of like React's context,
+ * but on the server side, per request.
+ *
+ * @param newTheme
+ */
+export function setTheme(newTheme: Theme) {
+  getRef().current = newTheme
+
+  return newTheme
+}
+
+/**
+ * Get the global theme
+ *
+ * Note: This must be called after setTheme() has been called in the page/layout.
+ * If called before setTheme(), it will return DEFAULT_THEME.
+ */
+export function getTheme(): Theme {
+  return getRef().current ?? DEFAULT_THEME
+}