Technician guide with screenshots; USB 2.0 type-A cable requirement

docs/INSTRUKCJA_TECHNIKA.md: install, update, connecting the box, reading
the Diagnosis panel, guided checks, Wi-Fi over USB, flashing, SD card,
service report, LED table and common problems, with screenshots of the
app rendered from a real v13 capture (docs/img). The box must be
connected with a USB 2.0 type-A cable directly to the computer; the
quick-start screen and README say so too.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

kota_tech/ui/cheatsheet.py

@@ -54,7 +54,8 @@ HINTS = [
 
 STEPS = [
     "Switch the sensorbox <b>power switch ON</b>.",
-    "Connect the laptop to the box's <b>native USB</b> port with a data-capable cable.",
+    "Connect the box with a <b>USB 2.0 cable with a type-A plug</b>, directly to a USB-A port of the laptop "
+    "(no hub, dock or USB-C adapter; the cable must carry data).",
     "Open the <b>Serial monitor</b> tab, choose the sensorbox port, press "
     "<b>Connect</b>.",
     "Press <b>Reset &amp; capture</b> to record a full boot log from the first line.",