docs(docs-infra): preserve content before docs-card-container in adev

The tokenizer regex pattern `[^<]*` was consuming all non-`<` content
before custom HTML tags, causing lost content.

Changed to `\s*` which only allows leading whitespace, letting marked
properly tokenize preceding content.

adev/shared-docs/pipeline/shared/marked/extensions/docs-card/docs-card-container.mts

@@ -21,7 +21,7 @@ interface DocsCardContainerToken extends Tokens.Generic {
 // Capture group 1: all attributes on the opening tag
 // Capture group 2: all content between the open and close tags
 const cardContainerRule =
-  /^[^<]*<docs-card-container(?:\s([^>]*))?>((?:.(?!\/docs-card-container))*)<\/docs-card-container>/s;
+  /^\s*<docs-card-container(?:\s([^>]*))?>((?:.(?!\/docs-card-container))*)<\/docs-card-container>/s;
 const headerTitleRule = /headerTitle="([^"]*)"/;
 const headerImgSrcRule = /headerImgSrc="([^"]*)"/;
 

adev/shared-docs/pipeline/shared/marked/extensions/docs-card/docs-card.mts

@@ -23,7 +23,7 @@ interface DocsCardToken extends Tokens.Generic {
 
 // Capture group 1: all attributes on the opening tag
 // Capture group 2: all content between the open and close tags
-const cardRule = /^[^<]*<docs-card(?:\s([^>]*))?>((?:.(?!\/docs-card))*)<\/docs-card>/s;
+const cardRule = /^\s*<docs-card(?:\s([^>]*))?>((?:.(?!\/docs-card))*)<\/docs-card>/s;
 
 const titleRule = /title="([^"]*)"/;
 const linkRule = /link="([^"]*)"/;

adev/shared-docs/pipeline/shared/marked/test/docs-card-container/docs-card-container.md

@@ -1,4 +1,39 @@
+Introductory paragraph that should be preserved before any card containers.
+
+## First Section
+
+This section contains important information about the feature status.
+
+### Available features
+
+- Feature one
+- Feature two
+- Feature three
+
+### In progress
+
+The following items are currently being developed:
+
+1. Item A with description
+2. Item B with description
+
 <docs-card-container>
-  <docs-card></docs-card>
-  <docs-card></docs-card>
+  <docs-card title="Card One"></docs-card>
+  <docs-card title="Card Two"></docs-card>
 </docs-card-container>
+
+### Additional context
+
+More text after the first card container that should also be preserved.
+
+## Second Section
+
+Another paragraph before the second card container.
+
+<docs-card-container>
+  <docs-card title="Card Three"></docs-card>
+</docs-card-container>
+
+## Final Section
+
+Concluding remarks at the end of the document.

adev/shared-docs/pipeline/shared/marked/test/docs-card-container/docs-card-container.spec.mts

@@ -20,10 +20,60 @@ describe('markdown to html', () => {
     markdownDocument = JSDOM.fragment(await parseMarkdown(markdownContent, rendererContext));
   });
 
-  it('creates card containers containing multiple cards', () => {
-    const containerEl = markdownDocument.querySelector('.docs-card-grid');
+  it('creates multiple card containers with correct card counts', () => {
+    const containers = markdownDocument.querySelectorAll('.docs-card-grid');
 
-    expect(containerEl!.children.length).toBe(2);
-    expect(containerEl!.classList.contains('docs-card-grid')).toBeTrue();
+    expect(containers.length).toBe(2);
+    expect(containers[0].children.length).toBe(2);
+    expect(containers[1].children.length).toBe(1);
+  });
+
+  it('preserves all h2 section headings', () => {
+    const h2Elements = markdownDocument.querySelectorAll('h2');
+
+    expect(h2Elements.length).toBe(3);
+    expect(h2Elements[0].textContent).toContain('First Section');
+    expect(h2Elements[1].textContent).toContain('Second Section');
+    expect(h2Elements[2].textContent).toContain('Final Section');
+  });
+
+  it('preserves all h3 subsection headings outside card containers', () => {
+    // Card titles also render as h3, so we filter to only h3s not inside card containers
+    const allH3s = Array.from(markdownDocument.querySelectorAll('h3'));
+    const sectionH3s = allH3s.filter((h3) => !h3.closest('.docs-card-grid'));
+
+    expect(sectionH3s.length).toBe(3);
+    expect(sectionH3s[0].textContent).toContain('Available features');
+    expect(sectionH3s[1].textContent).toContain('In progress');
+    expect(sectionH3s[2].textContent).toContain('Additional context');
+  });
+
+  it('preserves unordered lists before card containers', () => {
+    const ulElements = markdownDocument.querySelectorAll('ul');
+
+    expect(ulElements.length).toBeGreaterThanOrEqual(1);
+    expect(ulElements[0].children.length).toBe(3);
+    expect(ulElements[0].textContent).toContain('Feature one');
+  });
+
+  it('preserves ordered lists before card containers', () => {
+    const olElements = markdownDocument.querySelectorAll('ol');
+
+    expect(olElements.length).toBe(1);
+    expect(olElements[0].children.length).toBe(2);
+    expect(olElements[0].textContent).toContain('Item A');
+  });
+
+  it('preserves paragraphs throughout the document', () => {
+    const paragraphs = markdownDocument.querySelectorAll('p');
+
+    expect(paragraphs.length).toBeGreaterThanOrEqual(5);
+
+    const paragraphTexts = Array.from(paragraphs).map((p) => p.textContent);
+    expect(paragraphTexts.some((t) => t?.includes('Introductory paragraph'))).toBeTrue();
+    expect(paragraphTexts.some((t) => t?.includes('important information'))).toBeTrue();
+    expect(paragraphTexts.some((t) => t?.includes('More text after'))).toBeTrue();
+    expect(paragraphTexts.some((t) => t?.includes('Another paragraph'))).toBeTrue();
+    expect(paragraphTexts.some((t) => t?.includes('Concluding remarks'))).toBeTrue();
   });
 });