Wait for fence and link formatting before settling markdown rows

Formatted heading and bold can paint while fence markers and link
syntax are still literal. Settle now requires those negatives too,
matching the rest of the test's assertions.

Author: TheGreatAxios

src/tui/markdown-rows.test.ts

@@ -73,15 +73,20 @@ describe("markdown transcript rows", () => {
 
       const frame = await settle(
         h,
-        // Require formatted heading and bold: "docs" plus absence of "## Title"
-        // can match a frame where the heading has not painted yet (same class as
-        // the ### heading flake below).
+        // Require formatted heading, bold, fence, and link: "docs" plus
+        // absence of "## Title" can match a frame where the heading has not
+        // painted yet, and formatted heading+bold can land while fence/link
+        // syntax is still literal (same class as the ### heading flake below).
         (f) =>
           f.includes("Title") &&
           f.includes("bolded") &&
           f.includes("docs") &&
+          f.includes("alpha") &&
+          f.includes("const x = 1") &&
           !f.includes("## Title") &&
-          !f.includes("**bolded**"),
+          !f.includes("**bolded**") &&
+          !f.includes("```") &&
+          !f.includes("](https://example.com/docs)"),
       );
       expect(frame).toContain("Title");
       expect(frame).not.toContain("## Title");