Fix TypeScript errors and build plugin

- Add proper type annotation for node variable
- Add null check in forEach callback
- Plugin now builds successfully

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.claude/settings.local.json

@@ -4,7 +4,9 @@
       "Bash(git init:*)",
       "Bash(git add:*)",
       "Bash(git commit:*)",
-      "Bash(git remote add:*)"
+      "Bash(git remote add:*)",
+      "Bash(npm install:*)",
+      "Bash(npm run build:*)"
     ],
     "deny": [],
     "ask": []