Can a prompt replace TextExpander?

Build a macOS menu-bar app that expands short typed abbreviations into longer text, system-wide. Use Swift and the macOS Accessibility API (CGEventTap) to watch keystrokes; request Accessibility permission on first launch with a clear explanation before opening System Settings. Store snippets as an abbreviation-to-expansion table (SQLite or a plain JSON file) editable from a simple menu-bar window: add, edit, delete, search. Support a small set of fill-in variables inside an expansion: the current date in a couple of formats, and a cursor-position marker that positions the text cursor after expansion. Detect the trigger abbreviation as the user finishes typing it (a word boundary or an explicit trigger key) and replace it in place using synthetic keyboard events. Add an app-exclusion list for cases where expansion should never fire (password fields, terminal apps). Include import/export of the snippet library as JSON. Do not build cross-device sync, a team-shared library, or a plugin system — those are out of scope; this is a single-machine, single-user tool. No account or API key needed.