fix: use switch and not checkout

01_essentials/03-branching/setup.ps1

@@ -76,10 +76,10 @@ Write-Host "`n=== Setup Complete! ===" -ForegroundColor Green
 Write-Host "`nYour challenge environment is ready in the 'challenge/' directory." -ForegroundColor Cyan
 Write-Host "`nNext steps:" -ForegroundColor Cyan
 Write-Host "  1. cd challenge" -ForegroundColor White
-Write-Host "  2. Create a new branch: git checkout -b feature-login" -ForegroundColor White
+Write-Host "  2. Create a new branch: git switch -c feature-login" -ForegroundColor White
 Write-Host "  3. Create login.py and commit it" -ForegroundColor White
 Write-Host "  4. Make another commit on the feature branch" -ForegroundColor White
-Write-Host "  5. Switch back to main: git checkout main" -ForegroundColor White
+Write-Host "  5. Switch back to main: git switch main" -ForegroundColor White
 Write-Host "  6. Observe that login.py doesn't exist on main!" -ForegroundColor White
 Write-Host "  7. Run '..\verify.ps1' to check your solution" -ForegroundColor White
 Write-Host ""

01_essentials/05-merge-conflicts/setup.ps1

@@ -60,7 +60,7 @@ git add config.json
 git commit -m "Add timeout configuration" | Out-Null
 
 # Switch to feature branch: Add debug setting (conflicting change)
-git checkout update-config | Out-Null
+git switch update-config | Out-Null
 
 $featureConfig = @"
 {
@@ -78,7 +78,7 @@ git add config.json
 git commit -m "Add debug mode configuration" | Out-Null
 
 # Switch back to main branch
-git checkout main | Out-Null
+git switch main | Out-Null
 
 # Return to module directory
 Set-Location ..