chore: add icon.ico so the exe gets the proper program icon
thor-watcher had no icon.ico, so build.bat's 'if exist icon.ico' check always fell through to building without --icon → PyInstaller's default Python/floppy icon. Reuse the shared Terra-Mechanics icon from series3-watcher; build.bat now picks it up automatically (no script change needed). Rides with the pending 0.4.1 build. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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