feat: add TypeScript definitions and utility functions for date formatting

- Created a global TypeScript declaration for the txadmin interface on the Window object.
- Implemented date formatting utilities using date-fns with Spanish locale support.
- Added TypeScript configuration files for app, Electron, and Node environments.
- Set up Vite configuration for React application.

.gitignore

@@ -24,6 +24,16 @@ server/*.local
 server/build
 # server/uploads
 
+# txadmin Electron app
+txadmin/node_modules
+txadmin/dist
+txadmin/dist-electron
+txadmin/release
+txadmin/release-portable
+txadmin/*.local
+txadmin/*.tsbuildinfo
+txadmin/node_modules/.tmp
+
 # Editor directories and files
 .vscode/*
 !.vscode/extensions.json