Development: change frontend package manager to pnpm (#9363)

.github/dependabot.yml

@@ -1,14 +1,15 @@
-# https://docs.github.com/en/code-security/supply-chain-security/keeping-your-dependencies-updated-automatically/configuration-options-for-dependency-updates#package-ecosystem
+# Please see the documentation for all configuration options:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
 
 version: 2
 # Required for uv support for now
 enable-beta-ecosystems: true
 updates:
 
-  # Enable version updates for npm
+  # Enable version updates for pnpm
   - package-ecosystem: "npm"
     target-branch: "dev"
-    # Look for `package.json` and `lock` files in the `/src-ui` directory
+    # Look for `pnpm-lock.yaml` file in the `/src-ui` directory
     directory: "/src-ui"
     open-pull-requests-limit: 10
     schedule: