dendyerbrace/myfxbook-core ? reverse-engineered prompt

Build me a simple Windows productivity app called Myfxbook Core that is easy to set up and keeps things organized.

I want it to help with calendar integration, reminders, and a focus mode so I can stay on task during the day. It should also have a few ready made templates for common things like projects, meetings, sprints, and notes, and it should work offline with syncing when the internet comes back. If possible, make it feel like a clean desktop tool that opens fast and does not need any extra installs.

Please make the main flow really straightforward, with a setup screen, a home dashboard, and clear places to view reminders, calendar items, and focus sessions. If you need to look up current docs online, do that. Keep it polished, practical, and ready to run on Windows.