TaskyPad 1.1.1

Refactor file management and update note paths

Updated file storage paths to use dynamic directories under the user's local application data folder, improving compatibility and eliminating hardcoded paths. Changed the file extension for notes from `.txt` to `.tpn` for better domain alignment.

Refactored methods in `EditorNota.xaml.cs` and `MainWindow.xaml.cs` to use the new `LoadNotasPath()` method for note storage. Removed redundant directory creation logic.

Updated `TaskService.cs` to use dynamic paths for task storage and removed hardcoded directory logic. Introduced `TareasFilePath` for clarity.

Incremented `AssemblyVersion` to `1.1.1` to reflect these changes.