Technician tool v0.4

Imported from the Google Drive folder 004-technician_tool/v0.4.

kota_tech/ui/cheatsheet.py

@@ -40,7 +40,8 @@ HINTS = [
     "reboot name the cause.",
     "<b>Small LED next to the RGB LED</b> blinks once per second while the "
     "firmware runs. Not blinking = firmware hung or not running.",
-    "<b>Outside the case</b>: power switch and the Matter button. Holding the "
+    "<b>Outside the case</b> (back): power switch, the <b>microphone switch</b> just above it "
+    "(off = no noise measurements), and the Matter button. Holding the "
     "Matter button <b>5 s</b> factory-resets the box (it forgets its Matter "
     "network and must be commissioned again with the sticker QR code).",
     "<b>Inside the case</b> (unscrew): RESET and BOOT buttons and the SD card. "