chore(deps): remove unused pnpm overrides (#8973)

Drop four overrides that no package in the workspace depends on
(direct or transitive): js-yaml, happy-dom, tar-fs, and
@isaacs/brace-expansion. Verified against pnpm-lock.yaml — no resolved
entries existed, so the overrides were dead weight.

Author: sriramveeraghanta

package.json

@@ -44,15 +44,12 @@
       "mdast-util-to-hast": "13.2.1",
       "valibot": "1.2.0",
       "glob": "11.1.0",
-      "js-yaml": "4.1.1",
       "brace-expansion": "5.0.5",
       "nanoid": "3.3.8",
       "esbuild": "0.25.0",
       "@babel/helpers": "7.26.10",
       "@babel/runtime": "7.26.10",
       "chokidar": "3.6.0",
-      "happy-dom": "20.0.2",
-      "tar-fs": "3.0.9",
       "prosemirror-view": "1.40.0",
       "@types/express": "4.17.23",
       "typescript": "catalog:",
@@ -61,7 +58,6 @@
       "diff": "5.2.2",
       "webpack": "5.104.1",
       "lodash-es": "catalog:",
-      "@isaacs/brace-expansion": "5.0.1",
       "lodash": "4.18.1",
       "markdown-it": "14.1.1",
       "rollup": "4.59.0",