fix(client): declare browser-only externals as devDependencies

react, react-dom, shiki, katex, clsx, the micromark and mdast families and nine
more reach only browser artifacts, which resolve nothing on a user's machine.
Moving 79 declarations out of dependencies and non-optional peerDependencies
drops 103 tarballs and 6.05 MB from an install of the published CLI.

packages/client/ui-settings-plugins/package.json

@@ -56,8 +56,7 @@
     "@deepseek-ai/dsh-client-ui-settings": "workspace:^",
     "@deepseek-ai/dsh-client-ui-slots": "workspace:^",
     "@deepseek-ai/dsh-client-web-react": "workspace:^",
-    "@deepseek-ai/dsh-invariants": "workspace:^",
-    "react": "^18.2.0"
+    "@deepseek-ai/dsh-invariants": "workspace:^"
   },
   "devDependencies": {
     "@deepseek-ai/cordis": "workspace:^",
@@ -72,6 +71,7 @@
     "@deepseek-ai/dsh-client-web-react": "workspace:^",
     "@deepseek-ai/dsh-invariants": "workspace:^",
     "@types/react": "~18.3.1",
+    "clsx": "^2.0.0",
     "react": "^18.2.0"
   },
   "files": [
@@ -79,8 +79,5 @@
     "lib/invariant.js",
     "lib/client.js",
     "lib/types/**/*.d.ts"
-  ],
-  "dependencies": {
-    "clsx": "^2.0.0"
-  }
+  ]
 }