refactor: improve groups LiveView based on code review feedback

CODE_GUIDELINES.md

@@ -1010,6 +1010,10 @@ let liveSocket = new LiveSocket("/live", Socket, {
 
 ### 3.8 Code Quality: Credo
 
+**Static Code Analysis:**
+
+We use **Credo** for static code analysis to ensure code quality, consistency, and maintainability. Credo checks are **mandatory** and must pass before code can be merged.
+
 **Run Credo Regularly:**
 
 ```bash
@@ -1020,6 +1024,13 @@ mix credo
 mix credo --strict
 ```
 
+**CI Enforcement:**
+
+- ✅ **All Credo checks must pass in CI pipeline**
+- ✅ Pull requests will be blocked if Credo checks fail
+- ✅ Run `mix credo --strict` locally before pushing to catch issues early
+- ✅ Address all Credo warnings and errors before requesting code review
+
 **Key Credo Checks Enabled:**
 
 - Consistency checks (spacing, line endings, parameter patterns)