Fix dashcam detection for whole-disk (superfloppy) SD card formats

First real-hardware test revealed the connected dashcam's SD card ships
factory-formatted with no partition table - lsblk reports it as a bare
"disk" with an fstype set directly, never as a child "part". The
previous detection logic only matched type=="part", so it silently
missed this real device entirely.

list_usb_storage_partitions() now also matches whole-disk USB devices
that have no children and an fstype set directly on them, in addition
to the existing partition-table case. Verified against a fixture built
from this dashcam's actual `lsblk -J` output.

Co-authored-by: Copilot <[email protected]>

modules/app_dash.py

@@ -7,12 +7,14 @@ etc. - all common dashcam brands are covered since we just walk the whole
 filesystem for video extensions instead of assuming a specific folder name),
 then unmounts it again.
 
-Detection is done via `lsblk`, filtering for partitions whose parent disk is
+Detection is done via `lsblk`, filtering for volumes whose parent disk is
 attached over USB (TRAN == "usb"). This is what actually distinguishes a
 plugged-in dashcam/USB stick from the Pi's own storage (the boot/root
 partitions are on the onboard SD card, transport "mmc", never "usb") - so
 it's safe to run against real hardware without risk of touching the Pi's own
 filesystem, regardless of which /dev/sdX letter the kernel happens to assign.
+Both real partitions and whole-disk "superfloppy" (no partition table)
+layouts are matched - some dashcam SD cards ship factory-formatted that way.
 """
 import json
 import os
@@ -32,12 +34,19 @@ DEFAULT_DESTINATION = os.path.join(
 
 
 def list_usb_storage_partitions():
-    """Return a list of dicts describing USB-attached storage partitions.
+    """Return a list of dicts describing USB-attached storage volumes.
 
-    Each dict has: path, fstype, label, size, mountpoint. Only partitions
+    Each dict has: path, fstype, label, size, mountpoint. Only volumes whose
-    whose parent disk reports TRAN "usb" are included - this is what makes
+    parent disk reports TRAN "usb" are included - this is what makes the
-    the detection brand/device-agnostic (no hardcoded /dev/sda) while still
+    detection brand/device-agnostic (no hardcoded /dev/sda) while still
     being safe (never matches the Pi's own onboard mmc storage).
+
+    Includes both real partitions (type "part", the common case) *and*
+    whole-disk USB devices with an `fstype` set directly on them (type
+    "disk" but no partition table - a "superfloppy" layout with no MBR/GPT).
+    Several real dashcam SD cards ship formatted this way straight from the
+    factory - lsblk reports them as a bare "disk" with an fstype, never as a
+    child "part", so excluding them would silently miss those cameras.
     """
     try:
         result = subprocess.run(
@@ -61,7 +70,12 @@ def list_usb_storage_partitions():
     def walk(devices, inherited_tran=None):
         for device in devices:
             tran = device.get("tran") or inherited_tran
-            if device.get("type") == "part" and tran == "usb":
+            children = device.get("children") or []
+            is_partition = device.get("type") == "part"
+            is_superfloppy_disk = (
+                device.get("type") == "disk" and not children and device.get("fstype")
+            )
+            if tran == "usb" and (is_partition or is_superfloppy_disk):
                 partitions.append(
                     {
                         "path": device.get("path"),
@@ -71,7 +85,6 @@ def list_usb_storage_partitions():
                         "mountpoint": device.get("mountpoint"),
                     }
                 )
-            children = device.get("children") or []
             if children:
                 walk(children, tran)