apon133/toolify ? reverse-engineered prompt

Build me a Flutter app called Toolify that feels like a single place for lots of everyday tools. I want a clean home screen with simple categories like fitness, utility, productivity, finance, education, travel, creativity, entertainment, and security, and each category should open a list of tool pages. Focus on the most useful basics first, like calculator style tools, timers, trackers, scanners, notes, reminders, converters, and a few fun extras, then leave room for more later.

Make it easy to navigate, polished on mobile, and ready to ship on Android, iPhone, web, and desktop if possible. Use a friendly modern UI, simple cards, icons, and clear labels so someone can quickly find what they need. If some features are too big to finish in one pass, make them look real with sensible placeholders and working screens. Look up current Flutter docs online if you need to.