🌱 (chore): enable whitespace linter in golangci-lint config

Adds `whitespace` to the list of active linters in `.golangci.yml`
to enforce consistent formatting and improve code cleanliness.

Author: kersten

.golangci.yml

@@ -90,4 +90,5 @@ linters:
     - unconvert
     - unparam
     - unused
+    - whitespace