fix: patch in #366 and #367 for marked-terminal (#916)

This PR uses [`pnpm
patch`](https://www.petermekhaeil.com/til/pnpm-patch/) to pull in the
following proposed fixes for `marked-terminal`:

* https://github.com/mikaelbr/marked-terminal/pull/366
* https://github.com/mikaelbr/marked-terminal/pull/367

This adds a substantial test to `codex-cli/tests/markdown.test.tsx` to
verify the new behavior.

Note that one of the tests shows two citations being split across a line
even though the rendered version would fit comfortably on one line.
Changing this likely requires a subtle fix to `marked-terminal` to
account for "rendered length" when determining line breaks.

package.json

@@ -29,6 +29,11 @@
   "overrides": {
     "punycode": "^2.3.1"
   },
+  "pnpm": {
+    "patchedDependencies": {
+      "marked-terminal@7.3.0": "patches/marked-terminal@7.3.0.patch"
+    }
+  },
   "engines": {
     "node": ">=22",
     "pnpm": ">=9.0.0"