fix(core): add picomatch (#388)

<!-- CURSOR_SUMMARY -->
> [!NOTE]
> Introduces `picomatch` as a runtime dependency in core and updates the lockfile accordingly.
> 
> - Adds `picomatch@^4.0.3` to `packages/core/package.json` dependencies
> - Updates `pnpm-lock.yaml` to include `picomatch`
> 
> <sup>Written by [Cursor Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit cb878c2. This will update automatically on new commits. Configure [here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: Brooooooklyn

packages/core/package.json

@@ -87,6 +87,7 @@
     "@babel/types": "^7.28.5",
     "@oxc-project/runtime": "catalog:",
     "lightningcss": "^1.30.2",
+    "picomatch": "^4.0.3",
     "postcss": "^8.5.6",
     "semver": "^7.7.3",
     "tree-kill": "^1.2.2"