Sudip-pandey/isptoolkit-v2 ? reverse-engineered prompt

Build me a native Android app called ISP TOOLKIT for ISP field technicians and network engineers. I want it to work fully offline by default, save data locally, and never fake any diagnostic values, so if Android does not expose something it should clearly show Unavailable or Permission Required.

The app should help with Wi Fi and LAN diagnostics, live network info, ping and packet loss tests, DNS lookups, subnet calculations, MAC and OUI lookup, and a Wi Fi signal meter with a rolling graph. It should also scan the local network to find devices, identify routers and printers when possible, show confidence levels for each result, and export discovered devices as CSV, JSON, or text reports.

I also want fiber and ODN tools like optical power conversion, splitter and coupler calculators, link budget calculations, and a place to store ONT readings and technician notes. Please make it look modern with Material 3, Compose, and clean navigation, and include a router management screen with an embedded web view for supported devices.