trisetyop/hisabwin ? reverse-engineered prompt

Build me a desktop app called HisabWin for visualizing the visibility of the new crescent moon around the world, with a special focus on Indonesia. I want it to feel modern and friendly, but still work fully offline once installed. It should be able to find conjunction times automatically through the year, show world and Indonesia visibility maps, and let me switch between a more accurate mode and a faster lighter mode.

Please also include eclipse features for both solar and lunar eclipses, a calendar converter between Gregorian and Hijri dates, prayer time and qibla direction tools, and an ephemeris view for the Sun, Moon, and planets. If possible, add support for custom JPL Horizons objects too. Make the interface a clean Windows style desktop app with tabs, a splash screen, and bundled data so users can just install it and run it without needing internet. If you need to check any current docs or libraries online, go ahead and do that.