Settings: its rows in five groups

Settings had grown to 21 rows in one list. It opens on five groups (This
device, Display, GNSS and radio, Network, System); Enter opens one, Back
returns to the groups, and Back from the groups leaves Settings.

SettingsMenu holds the groups and which one is open (host-tested: every
setting is in exactly one group). The guide, the how-tos, the README,
the scripts' messages and the firmware's own name the new paths, such as
"Settings > System > Firmware".

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0162FokPdvY2KsS4NBfwyWPk

site/content/guide/gnss.md

@@ -7,13 +7,13 @@ tag = "GNSS"
 screens = ["sky.png"]
 +++
 
-GNSS needs the **Cap LoRa-1262**, an antenna with a view of the sky, and **Settings → GNSS** switched **On**. Otherwise the App says `GNSS is off` (or `paused`, when "Pause GNSS for LoRa" has put the receiver on standby while the radio listens). A first fix outdoors can take a while: the App says how long it has been searching.
+GNSS needs the **Cap LoRa-1262**, an antenna with a view of the sky, and **Settings → GNSS and radio → GNSS** switched **On**. Otherwise the App says `GNSS is off` (or `paused`, when "Pause GNSS for LoRa" has put the receiver on standby while the radio listens). A first fix outdoors can take a while: the App says how long it has been searching.
 
 ## Position
 
 The first view shows the fix (`No Fix`, `2D Fix` or `3D Fix`, and how many satellites it uses), then:
 
-- **Lat** and **Lon**, in decimal degrees or degrees, minutes and seconds (**Settings → Coordinates**);
+- **Lat** and **Lon**, in decimal degrees or degrees, minutes and seconds (**Settings → GNSS and radio → Coordinates**);
 - the **Locator**, the Maidenhead grid square;
 - **Altitude**, **Speed** and the direction you are moving;
 - **HDOP**, the horizontal precision: a smaller number is better;