Landaluce/Textr ? reverse-engineered prompt

Build me a Linux text expander app that works anywhere on X11. I want to type short triggers like sig or :d and have them expand into full text, code snippets, or simple actions, even inside other apps. It should have a small GUI for managing snippets and basic settings, but keep running in the background after I hide the window.

Please include three kinds of snippets, plain text, language specific templates, and commands that can do things like insert the date, switch languages, pause or resume expansion, reload snippets, show or hide the window, and quit the app. I also want a global shortcut, Ctrl+Shift+P, to toggle pause and resume.

Make it feel reliable, with word boundary matching so triggers do not fire in the middle of words, and handle errors without dying silently. Use a simple local JSON file for config and snippets, and if you need to check current docs for any library details, go ahead and look them up online.