fix(wh): codeblock not merging properly when there's nothing infront of it

src/v1/merger.ts

@@ -162,7 +162,7 @@ function merge(
     typeof b === "string"
   ) {
     const combined = (() => {
-      const CODEBLOCK_MATCHER = /^([^`]+)```(?:([a-z]*)\n)?([^`]+)```\n?/m;
+      const CODEBLOCK_MATCHER = /^([^`]*)```(?:([a-z]*)\n)?([\s\S]*?)```\n?$/;
       const [ma, mb] = [a.match(CODEBLOCK_MATCHER), b.match(CODEBLOCK_MATCHER)];
       log.debug`${ma} ${mb}`;
       if (ma && mb && ma[1] === mb[1]) {