Add interactive Markdown checklist toggles in the ticket preview.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/ui/views/markdown_test.go

@@ -30,3 +30,14 @@ func TestRenderMarkdownFastWithoutAutoStyle(t *testing.T) {
 	}
 	t.Logf("first=%v cached=%v", elapsed, time.Since(start))
 }
+
+func TestRenderDescriptionHighlightsCheckbox(t *testing.T) {
+	src := "Intro\n\n- [ ] one\n- [x] two\n"
+	out := views.RenderDescription(src, 40, 0)
+	if !strings.Contains(out, "one") || !strings.Contains(out, "[ ]") {
+		t.Fatalf("expected unchecked item in output: %q", out)
+	}
+	if !strings.Contains(out, "two") || !strings.Contains(out, "[x]") {
+		t.Fatalf("expected checked item in output: %q", out)
+	}
+}