add direct dependency on illustrations (#1744)

fixes build errors related to dependency not found, because ErrorPage is present in barrel file and needs to be resolvable even if not used.

.changeset/gentle-worms-dance.md

@@ -0,0 +1,5 @@
+---
+'@itwin/itwinui-react': minor
+---
+
+`@itwin/itwinui-illustrations-react` has been made a direct dependency again, to avoid issues with bundlers attempting to bundle it even if `ErrorPage` is not used anywhere.

packages/itwinui-react/package.json

@@ -76,6 +76,7 @@
     "dev:styles": "yarn build:styles --watch"
   },
   "dependencies": {
+    "@itwin/itwinui-illustrations-react": "^2.1.0",
     "@floating-ui/react": "^0.26.3",
     "classnames": "^2.3.2",
     "react-table": "^7.8.0",
@@ -84,7 +85,6 @@
   },
   "devDependencies": {
     "@itwin/itwinui-css": "^2.1.0",
-    "@itwin/itwinui-illustrations-react": "^2.1.0",
     "@itwin/itwinui-variables": "3.0.0",
     "@swc/cli": "^0.1.62",
     "@swc/core": "^1.3.68",
@@ -114,15 +114,9 @@
     "vite": "^4.5.1"
   },
   "peerDependencies": {
-    "@itwin/itwinui-illustrations-react": "^2.1.0",
     "react": ">= 17.0.0 < 19.0.0",
     "react-dom": ">=17.0.0 < 19.0.0"
   },
-  "peerDependenciesMeta": {
-    "@itwin/itwinui-illustrations-react": {
-      "optional": true
-    }
-  },
   "lint-staged": {
     "*.{tsx,ts,jsx,js}": [
       "prettier --write",