Core: Fix source.getPageByHref() return no result without explicit language

.changeset/eight-pants-camp.md

@@ -0,0 +1,5 @@
+---
+'fumadocs-core': patch
+---
+
+Fix `source.getPageByHref()` return no result without explicit `language`

apps/docs/content/docs/ui/(ui)/components/index.mdx

@@ -44,4 +44,4 @@ return (
 [My Link](./file.mdx)
 ```
 
-[Example: `../feedback.mdx`](../feedback.mdx)
+[Example: `../../feedback.mdx`](../../feedback.mdx)

packages/core/src/source/loader.ts

@@ -375,7 +375,7 @@ function createOutput(options: LoaderOptions): LoaderOutput<LoaderConfig> {
         };
       }
     },
-    getPageByHref(href, { dir = '', language } = {}) {
+    getPageByHref(href, { dir = '', language = defaultLanguage } = {}) {
       const [value, hash] = href.split('#', 2);
       let target;