fix(messages): normalize escaped markdown newlines

src/shared/markdown-text.ts

@@ -0,0 +1,12 @@
+const ACTUAL_LINE_BREAKS = /\r\n?/g;
+const ESCAPED_CRLF = /\\r\\n/g;
+const ESCAPED_LF = /\\n/g;
+const ESCAPED_CR = /\\r/g;
+
+export function normalizeMarkdownText(text: string): string {
+  return text
+    .replace(ACTUAL_LINE_BREAKS, "\n")
+    .replace(ESCAPED_CRLF, "\n")
+    .replace(ESCAPED_LF, "\n")
+    .replace(ESCAPED_CR, "\n");
+}