Description:

Currently, the app assumes a fixed screen size for the LED badge display. To make the app compatible with multiple LED badge hardware variants, we should allow users to select the screen size manually, and ensure both virtual rendering and BLE data generation respect this selection.

• Let users manually select the LED badge screen dimensions (e.g., width × height).
• Adjust the virtual badge preview to match the selected screen size.
• Format the pixel/text data sent over BLE according to the selected size.
• Ensure the badge firmware (which is agnostic of screen size) renders the data as expected.