[BUG] Extra white space on right side for 77mm print; print fails for other paper sizes

[amrutakawale]

When printing using electron-pos-printer on a Star TSP100 printer:

1. For 77mm paper, the print output shows extra white space on the right side, even when using textAlign: "center".
2. When changing pageSize to other sizes (e.g., 80mm), the printer does not print at all.

Steps to Reproduce:
const { PosPrinter } = require("electron-pos-printer");

const options = {
preview: false,
margin: "0 0 0 0",
copies: 1,
printerName: "Your_Star_TSP100_Printer_Name",
timeOutPerLine: 5000,
silent: true,
pageSize: "77mm",
};

const data = [
{
type: "text",
value: "Test Print",
style: { textAlign: "center" },
},
];

PosPrinter.print(data, options);

Expected Behaviour:

Text should be centred without extra white space.
Should print correctly for all supported paper sizes.

Actual Behaviour:

For 77mm paper, the right side has extra white space.
For other sizes, nothing is printed.

Environment:

electron-pos-printer version: [1.3.8]
Electron: "electron": "^36.2.0",
OS: [Windows]
Printer: Star TSP100