Add PDF modal and selectedPost setter

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

node_modules/update-browserslist-db/index.d.ts

@@ -0,0 +1,6 @@
+/**
+ * Run update and print output to terminal.
+ */
+declare function updateDb(print?: (str: string) => void): void
+
+export = updateDb