Missing Final New Line in todo.txt

[nikbucher]

The current implementation does not append a final newline character when saving the todo.txt file. This behavior causes issues with the standard todo.txt CLI, which expects a final newline in the todo.txt file. As a result, a new task added by the CLI are appended to the last task instead of being placed on a new line.

Steps to Reproduce:

1. Save a todo.txt file using the current implementation.
2. Add a new task using the standard todo.txt CLI.
3. Notice that the new task is appended to the last task instead of being placed on a new line.

Expected Behavior:
A final newline character is added when the todo.txt file is saved, ensuring compatibility with the standard todo.txt CLI.

Suggested Fix:
Modify the writeToFile method to ensure that a final newline character is added when writing the todo.txt file here:

sleek/src/main/modules/File/Write.tsx

Lines 9 to 12 in c3fceea

	function writeToFile(string: string, filePath: string, bookmark: string | null) {
	const stopAccessingSecurityScopedResource = (process.mas && bookmark) ? app.startAccessingSecurityScopedResource(bookmark) : null;
	fs.writeFileSync(filePath, string, 'utf-8');

That would be great. Thanks a lot in advance.

Best regards - Nik