fix(ui): community v1.27 feedback — GPS altitude field, noise floor, Msg wake location, units

- Add a separate "Altitude (GPS)" dashboard field (label AltG) alongside
  the existing barometric one (now labelled "Altitude (Baro)") -- the
  original single Altitude field only ever read a barometric sensor's
  CayenneLPP telemetry, showing "--" on any board without one even with
  a perfectly good GPS fix.
- Every altitude reading (baro + GPS, Clock and Lock screen) and the GPS
  home page's "alt" row now go through a shared fmtAlt() helper and
  respect Settings > System > Units, same as every other distance in the
  UI -- none of them checked units_imperial before. Same fix for
  Locator's Radius row, which always showed metric regardless.
- Radio home page's noise floor showed "n/a" whenever Pwr save (RX
  duty-cycle) was on, on the assumption duty-cycle RX can't sample the
  floor. That's stale: RadioLibWrapper already periodically recalibrates
  it (noiseFloorCalibCheck(), every 60s) even under duty-cycle, which is
  exactly why Diagnostics' unconditional read of the same value was
  already showing something real. Radio home page now matches.
- Moved "Msg wake" from Settings > Sound to Settings > Display -- more
  logical home for a display-wake toggle than notifications. Menu-order
  only; NodePrefs storage is unaffected by this enum's ordering.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

docs/solo_features/clock_screen/clock_screen.md

@@ -40,12 +40,13 @@ Up to three data fields are shown below the date separator. Each field displays
 | Humidity    | Hum   | % from onboard sensor                                                     |
 | Pressure    | Pres  | hPa from onboard sensor                                                   |
 | GPS         | GPS   | `lat lon` decimal degrees, or `no fix`                                    |
-| Altitude    | Alt   | metres from onboard sensor (GPS or barometric)                            |
+| Altitude (Baro) | Alt | metres/feet (per Settings › System › Units) from onboard barometric sensor (`--` without one) |
 | Luminosity  | Lux   | lux from onboard sensor                                                   |
 | CO₂         | CO2   | ppm from onboard sensor                                                   |
 | Contacts    | Nodes | Total contacts in the mesh                                                |
 | Messages    | Msgs  | Total unread message count                                                |
 | Satellites  | Sats  | GPS satellite count (or `--` without GPS)                                 |
+| Altitude (GPS) | AltG | metres/feet (per Settings › System › Units) from the GPS fix (or `no fix`) |
 
 Sensor fields show `--` when the sensor is not connected or has no data.