feat: add --dry-run option

[ghiscoding]

• show what would be copied, without actually copying anything
• use --dry-run (CLI) or options.dryRun (API)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (ffe8d06) to head (da5686b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #22   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines          259       280   +21     
  Branches        80        87    +7     
=========================================
+ Hits           259       280   +21     

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