fix: preserve newlines when minifying llms-small Markdown

Copilot review: replacing all \s+ collapsed newlines inside fenced code and broke Markdown structure. Collapse spaces/tabs only; extend tests.

Made-with: Cursor

Author: gregnazario

src/lib/llms-html-sanitize.ts

@@ -31,7 +31,8 @@ export function htmlToLlmsMarkdown(html: string, shouldMinify = false): string {
   const sanitizedHtml = stripHtmlForLlmsExport(html, shouldMinify);
   let markdown = turndown.turndown(sanitizedHtml).trim();
   if (shouldMinify) {
-    markdown = markdown.replace(/\s+/g, " ");
+    // Collapse horizontal whitespace only; keep newlines so fenced code, lists, and headings stay valid Markdown.
+    markdown = markdown.replace(/[ \t]+/g, " ");
   }
   return markdown;
 }

tests/llms-html-sanitize.test.ts

@@ -40,8 +40,16 @@ describe("LLMs HTML sanitization and Markdown export", () => {
     expect(md).toMatch(/bold/);
   });
 
-  it("collapses whitespace when minify is true", () => {
-    const md = htmlToLlmsMarkdown("<p>One</p>\n\n<p>Two</p>", true);
-    expect(md).not.toMatch(/\n\n/);
+  it("when minifying, collapses runs of spaces and tabs only (preserves newlines)", () => {
+    const md = htmlToLlmsMarkdown("<p>One    two     three</p>", true);
+    expect(md).not.toMatch(/ {2,}/);
+  });
+
+  it("when minifying, keeps line breaks inside fenced code from Turndown", () => {
+    const md = htmlToLlmsMarkdown("<pre><code>const a = 1;\nconst b = 2;</code></pre>", true);
+    expect(md).toContain("```");
+    expect(md).toMatch(/a\s*=\s*1/);
+    expect(md).toMatch(/b\s*=\s*2/);
+    expect(md).toContain("\n");
   });
 });