Add @radix-ui/react-slot and drop the packageManager pin

Note: removing packageManager means Corepack no longer pins Yarn 4 for
this repo, so `yarn` resolves to whatever is installed globally.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016jWbNNJLksC1QG8z8845FX

yarn.lock

@@ -1500,7 +1500,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@radix-ui/react-slot@npm:1.3.3":
+"@radix-ui/react-slot@npm:1.3.3, @radix-ui/react-slot@npm:^1.3.3":
   version: 1.3.3
   resolution: "@radix-ui/react-slot@npm:1.3.3"
   dependencies:
@@ -4802,6 +4802,7 @@ __metadata:
     "@ai-sdk/react": "npm:^4.0.47"
     "@next/swc-wasm-web": "npm:16.2.10"
     "@openrouter/ai-sdk-provider": "npm:^3.0.0"
+    "@radix-ui/react-slot": "npm:^1.3.3"
     "@radix-ui/react-use-controllable-state": "npm:^1.2.6"
     "@remixicon/react": "npm:^4.9.0"
     "@shopify/storefront-api-client": "npm:^1.0.0"