RECEIPT PRINTER — WEBUSB EDITION (no bridge, no background app)
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WHAT CHANGED FROM THE OLD VERSION
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The old setup needed a Python script (print_bridge.py) running in the
background every time you wanted to print. This version removes that
entirely. The webpage now talks straight to the printer over USB using
your browser's built-in WebUSB feature. Nothing to start, no black window
to leave open.

Trade-off: Windows normally "owns" a USB printer through its own printer
driver, and that lock has to be handed to the browser instead. That's a
ONE-TIME step below using a small free tool called Zadig. After this one
step, this printer will only be usable through this webpage (Chrome/Edge) —
it will disappear from your normal Windows printer list. If you need to
print to it from other programs too, keep the printer's original driver
and don't do this step for that device (or use a second identical printer).

Only works in Chrome or Edge on desktop. Firefox and Safari do not support
WebUSB.


ONE-TIME SETUP (only needed once, ever, per printer + PC)
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1. Plug in the receipt printer and make sure Windows has already installed
   it normally (so you know it works).

2. Download Zadig (free, no install — just an .exe you run):
   https://zadig.akeo.ie/

3. Run Zadig. Turn on "Options -> List All Devices" so your printer shows
   up (it may not be listed by default).

4. In the dropdown, find your receipt printer. Common names include the
   printer's model number, or something generic like "USB Printing
   Support" — if unsure, unplug the printer, refresh the list, plug it
   back in, and see which entry appears/disappears.

5. On the right side, next to the green arrow, make sure the target driver
   is set to "WinUSB". Click "Replace Driver" (or "Install Driver").

6. Wait for it to finish, then close Zadig. That's it — this step never
   needs to be repeated for this printer on this PC.


EVERY TIME YOU WANT TO PRINT A RECEIPT
-----------------------------------------
1. Double-click "receipt-printer.html" to open it in Chrome or Edge.

2. Click "Connect Printer (USB)" — pick your printer from the browser's
   device picker. Your browser will remember it for next time, so this is
   normally a one-click, one-time-per-browser-profile step too.

3. Click the upload box and choose your receipt PDF. Fields fill in
   automatically.

4. Click "Print with Printer's Native Font". Done!


IF SOMETHING GOES WRONG
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- "This browser doesn't support WebUSB": switch to Chrome or Edge.
- Printer doesn't appear in the device picker: re-check the Zadig step —
  the driver must be WinUSB, and "List All Devices" must have been on
  when you found it.
- "No printable (bulk OUT) endpoint found": you may have picked the wrong
  USB entry in Zadig (some printers show multiple entries — try the other
  one) or the printer isn't a supported ESC/POS model.
- Printer stopped working with other Windows programs: expected — see the
  trade-off note above. Re-run Windows's normal driver install for that
  printer (via Devices & Printers) to restore normal printing, which will
  undo the WebUSB access.

Keep this file and receipt-printer.html together.