Dariokisumo/Jadwal ? reverse-engineered prompt

Build me a simple Flutter app for Android that helps teachers keep track of their daily timetable in a calm, easy to read way.

I want the app to work fully offline after setup, with no login or account. On first launch, guide the user through importing a timetable, first by showing a copyable prompt they can paste into an AI tool with a photo of their timetable, then by letting them upload the returned JSON file. The app should check that the file is valid before saving it.

Once the timetable is loaded, the home screen should clearly show what period is happening now, what comes next, and what has already passed. It should send local reminders when a period starts, and also have an Android home screen widget so the user can glance at today’s schedule without opening the app. Please include light and dark mode, simple clean UI, and local storage so the timetable stays on the device. If you need current Flutter or Android docs, look them up online.