Feature: Configurable margin offsets for PDF rendering via config.ini

[BrendM]

Feature Request

Add configurable width and height margin offsets for PDF rendering via config.ini, allowing users to shift the card grid from its auto-centered position.

Required for Epson EcoTank ET-8550 printer compatibility.

Current behavior

In pdf_gen() (main.py:94), margins are auto-calculated to center the card grid on the page:

rx, ry = round((pw - (w * cols)) / 2), round((ph - (h * rows)) / 2)

There is no way for the user to adjust this — the grid is always perfectly centered.

Desired behavior

Add Margin.X and Margin.Y settings to config.ini (in points) that offset the card grid from its default centered position. Useful for:

• Accommodating printer-specific feed offsets (e.g., Epson ET-8550)
• Fine-tuning card placement for non-standard paper
• Shifting the print area toward a specific edge (e.g., for binder or hole-punch clearance)

Suggested approach

1. Add Margin.X and Margin.Y options to config.ini under [DEFAULT] (default to 0)
2. Read them in pdf_gen() and apply to the existing rx/ry offsets
3. No GUI changes needed — just config-driven

Affected files

• main.py — pdf_gen() function
• config.ini — new margin defaults

[BrendM]

@preshtildeath please excuse the AI but just a small thing I needed for printing on an 8550, I have created a PR for it but i am on linux so have not tested this yet. Very handy project btw