fix(export): normalize all site-relative markdown image urls

Made-with: Cursor

app/utils/markdown-export.test.ts

@@ -13,6 +13,13 @@ describe("normalizeMarkdownImageUrls", () => {
     expect(result).toBe("![cover](https://example.com/public/assets/posts/cover.png)");
   });
 
+  test("converts other site-relative image links to absolute URLs", () => {
+    const markdown = "![hero](/images/a.png)";
+    const result = normalizeMarkdownImageUrls(markdown, "https://example.com");
+
+    expect(result).toBe("![hero](https://example.com/images/a.png)");
+  });
+
   test("keeps absolute http/https image links unchanged", () => {
     const markdown = [
       "![a](http://cdn.example.com/a.png)",

app/utils/markdown-export.ts

@@ -3,8 +3,6 @@ type MarkdownExportFileNameInput = {
   id: number;
 };
 
-const PUBLIC_ASSETS_PREFIX = "/public/assets/";
-
 function isAbsoluteOrSpecialUrl(url: string): boolean {
   return /^(https?:)?\/\//i.test(url) || /^data:/i.test(url);
 }
@@ -17,7 +15,7 @@ export function normalizeMarkdownImageUrls(markdown: string, origin: string): st
       return full;
     }
 
-    if (!rawUrl.startsWith(PUBLIC_ASSETS_PREFIX)) {
+    if (!rawUrl.startsWith("/")) {
       return full;
     }