Title: Fingerprint setup fails silently on FocalTech FT9366 reader (2808:a658) — migration 1785090473 assumption doesn't hold for this device ID

## What happened

`omarchy setup security fingerprint` detects the reader (via `omarchy-hw-fingerprint`) but enrollment never succeeds — `fprintd-list` reports "No devices available" and a debug run of `fprintd` shows:

```
libfprint-context-DEBUG: No driver found for USB device 2808:A658
```

The reader is a Realtek USB2.0 Finger Print Bridge / FocalTech FT9366 sensor (USB ID `2808:a658`), found on this ASUS Vivobook M6500QC.

Migration `1785090473.sh` ("Switch fingerprint support back to stock libfprint") assumes FocalTech MOC support landing in `libfprint` 1.94.100 covers this class of hardware, and actively uninstalls `libfprint-git` in favor of stock `libfprint`. That's true for FocalTech FT9349 (`2808:a97a`), which the migration cites explicitly, but **not** for FT9366 (`2808:a658`) — neither stock `libfprint` 1.94.100 nor the current `libfprint-git` snapshot (`1:1.94.10.r12.gd79f157-1.1`) has a driver entry for this ID. I confirmed both by installing `libfprint-git` and re-running the same debug probe, which still reported `No driver found for USB device 2808:A658`.

As far as I can tell there is currently no open-source libfprint driver for this exact chip at all (only a niche, unofficial proprietary-binary shim project exists: https://github.com/leopalladium/focaltech-ft9366-arch-shim).

## Expected

Either:
- `omarchy-hw-fingerprint` / `omarchy setup security fingerprint` should detect that no libfprint driver actually claims the device and fail with a clear "this reader isn't supported yet" message instead of walking through enrollment and failing opaquely, or
- if there's a known workaround Omarchy wants to support, point users at it.

## Steps to reproduce

1. On a machine with a FocalTech FT9366 reader (USB ID `2808:a658`) behind the Realtek USB2.0 Finger Print Bridge
2. Run `omarchy setup security fingerprint`
3. Detection passes, but `fprintd-enroll` / `fprintd-list` never see a device

## System details

- Omarchy version: 4.0.1-1
- Kernel: 7.1.9-arch1-2
- CPU: AMD Ryzen 7 5800H with Radeon Graphics
- GPU: NVIDIA GeForce RTX 3050 Mobile (GA107M) + AMD Radeon Vega (Cezanne)
- Machine: ASUSTeK COMPUTER INC. Vivobook_ASUSLaptop M6500QC_M6500QC
- Fingerprint reader: `2808:a658` Realtek USB2.0 Finger Print Bridge FocalTech Fingerprint Device
- `libfprint` 1.94.100-1 (stock, extra repo)
- `fprintd` 1.94.5-2

## Diagnostic output

```
$ fprintd-list $USER
No devices available

$ lsusb | grep -i finger
Bus 003 Device 002: ID 2808:a658 Realtek USB2.0 Finger Print Bridge FocalTech Fingerprint Device

$ FPRINT_DEBUG=1 /usr/lib/fprintd -t
...
libfprint-context-DEBUG: No driver found for USB device 2808:A658
...

$ grep 2808 /usr/lib/udev/rules.d/70-libfprint-2.rules
(no output — vendor ID 2808 is not present in libfprint's udev rules at all)
```