Simplify Conditionals

When simplifying complex conditional logic:

1. Read the entire conditional block and understand every branch — document what each path does.
2. Check for dead branches: conditions that can never be true. Remove them.
3. Invert negative conditions to reduce nesting: if (!valid) return; // rest of logic instead of if (valid) { // deeply nested }.
4. Extract complex conditions into named boolean variables: const isEligible = age >= 18 && hasConsent.
5. If a switch/if-else has many branches, consider replacing it with a lookup table or strategy pattern.
6. Run the tests after each simplification step to verify behavior is preserved.