feat(claude): add you-might-not-need-an-effect slash command

Author: waleedlatif1

.claude/commands/you-might-not-need-an-effect.md

@@ -0,0 +1,8 @@
+Arguments:
+- scope: what to analyze (default: your current changes). Examples: "diff to main", "PR #123", "src/components/", "whole codebase"
+- fix: whether to apply fixes (default: true). Set to false to only propose changes.
+
+Steps:
+1. Read https://react.dev/learn/you-might-not-need-an-effect to understand the guidelines
+2. Analyze the specified scope for useEffect anti-patterns
+3. If fix=true, apply the fixes. If fix=false, propose the fixes without applying.