Avicennasis/TypeIt4Me ? reverse-engineered prompt

Build me a small Windows app that lets me save text snippets and expand them with short shortcuts, like typing eml to insert my email address. I want it to work anywhere on the system with global hotkeys, stay out of the way in the tray, and have a clean interface where I can add, edit, search, and play snippets quickly. Please include a light and dark theme, a compact mini mode, and a settings area for things like auto lock and PIN protection. Snippets and settings should be saved locally in AppData, and the snippet data should be encrypted when a PIN is set, with secure handling so it does not use the clipboard for pasting. It should also support special key commands like Tab, Enter, arrow keys, function keys, and short delays inside snippets. If you need to check current .NET or WPF docs, look them up online.