docs: upgrade to tailwind v4, react 19, fuma docs 15 (#1735)

docs/lib/source.ts

@@ -0,0 +1,13 @@
+import { changelogCollection, docs } from "@/.source";
+import { loader } from "fumadocs-core/source";
+import { createMDXSource } from "fumadocs-mdx";
+
+export const source = loader({
+	baseUrl: "/docs",
+	source: docs.toFumadocsSource(),
+});
+
+export const changelogs = loader({
+	baseUrl: "/changelogs",
+	source: createMDXSource(changelogCollection),
+});