Fix extra whitespace in markdown rendering. (#3943)

Co-authored-by: Scott Densmore <scottdensmore@mac.com>

packages/cli/src/ui/utils/__snapshots__/MarkdownDisplay.test.tsx.snap

@@ -0,0 +1,89 @@
+// Vitest Snapshot v1, https://vitest.dev/guide/snapshot.html
+
+exports[`<MarkdownDisplay /> > correctly parses a mix of markdown elements 1`] = `
+"Main Title
+
+Here is a paragraph.
+
+ - List item 1
+ - List item 2
+
+ 1 some code
+
+Another paragraph.
+"
+`;
+
+exports[`<MarkdownDisplay /> > handles a table at the end of the input 1`] = `
+"Some text before.
+| A | B |
+|---|
+| 1 | 2 |"
+`;
+
+exports[`<MarkdownDisplay /> > handles unclosed (pending) code blocks 1`] = `" 1 let y = 2;"`;
+
+exports[`<MarkdownDisplay /> > inserts a single space between paragraphs 1`] = `
+"Paragraph 1.
+
+Paragraph 2."
+`;
+
+exports[`<MarkdownDisplay /> > renders a fenced code block with a language 1`] = `
+" 1 const x = 1;
+ 2 console.log(x);"
+`;
+
+exports[`<MarkdownDisplay /> > renders a fenced code block without a language 1`] = `" 1 plain text"`;
+
+exports[`<MarkdownDisplay /> > renders a simple paragraph 1`] = `"Hello, world."`;
+
+exports[`<MarkdownDisplay /> > renders headers with correct levels 1`] = `
+"Header 1
+Header 2
+Header 3
+Header 4
+"
+`;
+
+exports[`<MarkdownDisplay /> > renders horizontal rules 1`] = `
+"Hello
+---
+World
+---
+Test
+"
+`;
+
+exports[`<MarkdownDisplay /> > renders nested unordered lists 1`] = `
+" * Level 1
+   * Level 2
+     * Level 3
+"
+`;
+
+exports[`<MarkdownDisplay /> > renders nothing for empty text 1`] = `""`;
+
+exports[`<MarkdownDisplay /> > renders ordered lists 1`] = `
+" 1. First item
+ 2. Second item
+"
+`;
+
+exports[`<MarkdownDisplay /> > renders tables correctly 1`] = `
+"
+┌──────────┬──────────┐
+│ Header 1 │ Header 2 │
+├──────────┼──────────┤
+│ Cell 1   │ Cell 2   │
+│ Cell 3   │ Cell 4   │
+└──────────┴──────────┘
+"
+`;
+
+exports[`<MarkdownDisplay /> > renders unordered lists with different markers 1`] = `
+" - item A
+ * item B
+ + item C
+"
+`;