fix: collapse markup whitespace so blockquotes render without blank lines

app/test/parser_test.dart

@@ -165,6 +165,47 @@ void main() {
     expect(text, contains('Visible & intact.'));
   });
 
+  test('pretty-printed markup leaves no phantom blank content', () {
+    final source = '''
+<?xml version="1.0" encoding="UTF-8"?>
+<html xmlns="http://www.w3.org/1999/xhtml">
+  <head><title>Indent</title><meta name="mews-profile" content="0.1" /></head>
+  <body>
+    <blockquote>
+      <p>No blank line above this.</p>
+      <p>And none between paragraphs.</p>
+    </blockquote>
+    <ul>
+      <li>
+        <a href="2026-10-08-post.html">2026-10-08 A dated link</a>
+      </li>
+    </ul>
+    <p>
+      A paragraph with
+      wrapped lines.
+    </p>
+  </body>
+</html>
+''';
+    final page = parseMewsPage(source: source, url: 'https://example.com/indent.html');
+
+    // The quote holds its two paragraphs and nothing else.
+    final quote = page.body[0] as QuoteBlock;
+    expect(quote.children, hasLength(2));
+    expect((quote.children.first as ParagraphBlock).inline.single,
+        isA<MewsText>());
+
+    // The list item starts directly with the link, no blank run before it.
+    final list = page.body[1] as ListBlock;
+    final item = (list.items.single.blocks.single as ParagraphBlock).inline;
+    final link = item.single as MewsLink;
+    expect((link.children.single as MewsText).text, '2026-10-08 A dated link');
+
+    // Interior line breaks collapse to single spaces, like in browsers.
+    final paragraph = (page.body[2] as ParagraphBlock).inline;
+    expect((paragraph.single as MewsText).text, 'A paragraph with wrapped lines.');
+  });
+
   test('keeps bare inline content in list items and quotes', () {
     final source = '''
 <?xml version="1.0" encoding="UTF-8"?>