feat: per-contact actions, device settings, a companion CLI and your contact's QR code

- Nodes: telemetry permissions per contact, reset path, share nearby
  (L1 options menu; L2 node card with "Can ask for" switches)
- Settings > Privacy: fixed position (typed in, from a waypoint, cleared)
  and the Bluetooth PIN; Settings > System: factory reset, asked twice
- Companion CLI (CMD_RUN_CLI_COMMAND 66 / RESP_CODE_CLI_REPLY 29, as
  upstream; FIRMWARE_VER_CODE 14): upstream's command names plus a key for
  every schema setting (get / set / keys)
- Screenshots move to 0x7E; tools/screenshot.py falls back to 66 / 29
- Your contact as a QR code (meshcore://contact/add): Status > System on
  ui-new, Settings > About on the L2; Nayuki's qrcodegen made header-only

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

docs/solo/settings.md

@@ -11,10 +11,10 @@ board supports are shown.
 | **Sound** | Buzzer on / off / auto (quiet while the app is connected), volume, quiet hours, the melody for messages, channels and adverts |
 | **Home Pages** | Order of the home pages, and which are shown |
 | **Radio** | TX power, preset, frequency, SF / BW / CR, saved presets, Auto pwr, the scope list, then the advanced options (below) |
-| **System** | Device name, low-battery shutdown, GPS power saving, units, the battery curve, reboot |
+| **System** | Device name, low-battery shutdown, GPS power saving, units, the battery curve, reboot, factory reset |
 | **Keyboard** | ABC or T9 layout, the two scripts, CardKB mode |
 | **Contacts** | Show all or favourites only (DMs, channels, rooms), favourites on top, contact expiry and prune, which heard nodes are added |
-| **Privacy** | Whether your adverts carry your position, and who may ask for your status, location and sensor readings |
+| **Privacy** | Whether your adverts carry your position and which position, who may ask for your status, location and sensor readings, the Bluetooth PIN |
 | **Messages** | Automatic resend of direct messages, the ten quick messages |
 
 A few notes:
@@ -32,6 +32,9 @@ A few notes:
   doesn't follow the usual LiPo curve: **Left / Right** move a point by
   10 mV, **Reset** goes back to LiPo. The current voltage is shown, so a point
   can be set against what the battery reads.
+- **Factory reset** erases contacts, channels, messages, settings and the
+  node's keys, then restarts as a new node. It asks twice. On the Wio Tracker
+  L2 the SD card is left as it is.
 
 ### Adding contacts
 
@@ -53,10 +56,18 @@ nodes aren't added until you make room.
   including the automatic ones. Off, nodes see your name but not where you
   are. Live sharing and `{loc}` in a message still send it, because you send
   those on purpose.
+- **Position**: where your adverts say you are while the GPS is off. **Enter**
+  to type it in (`50.06143, 19.93658`), take it from a waypoint, or clear it.
+  With the GPS on, the row shows **GPS** and each fix replaces it; turning the
+  GPS off keeps the last fix. The phone app sets the same position.
 - **Ask status / loc / sens**: who may request your telemetry: **Nobody**,
-  **Allowed** (the contacts you gave that permission, for now in the phone
-  app) or **Everyone**. Status is the battery; a request for location or
+  **Allowed** (the contacts you gave that permission: **Telem** in a node's
+  options in [Nodes](./contacts.md#nearby-nodes), or the phone app) or
+  **Everyone**. Status is the battery; a request for location or
   sensors is answered only where status is allowed too.
+- **BT PIN**: the six-digit Bluetooth pairing PIN. Leave it empty for a new
+  random one at each start, shown on screen. A new PIN is used from the next
+  start; the phone pairs again after that.
 
 ### Advanced radio
 
@@ -84,4 +95,43 @@ if your mesh agrees on it.
 >   Bluetooth, WiFi, GPS. Adding contacts is in Messages & contacts.
 > - **Map & data**: Map (trail, live sharing and arrival alert options),
 >   Storage.
-> - **System**: Name, Time, Units, Firmware update, About; Reboot and Power off.
+> - **System**: Name, Time, Units, Firmware update, About; Reboot, Power off
+>   and Factory reset. Privacy holds **Fixed position** and, under
+>   Bluetooth, the **Pairing PIN**.
+
+## Console
+
+The phone app's console and the console in the site's
+[USB tools](https://solo.marekzegarek.com/#pc-tools) change settings by
+text. The commands are the ones upstream MeshCore's companion firmware has,
+so its documentation applies:
+
+| Command | Does |
+| --- | --- |
+| `get radio`, `set radio 869.525,250,11,5` | Frequency, bandwidth, SF and CR, applied at once |
+| `get tx`, `set tx 14` | TX power in dBm |
+| `get af` / `set af`, `get dutycycle` / `set dutycycle` | Airtime factor, or the same as a duty cycle in % |
+| `rxdelay`, `int.thresh`, `cad`, `radio.rxgain`, `path.hash.mode`, `multi.acks` | The advanced radio options, with `get` / `set` |
+| `get name`, `set name …` | The device name |
+| `get pin`, `set pin 123456` | The Bluetooth PIN, `0` for a random one; used from the next start |
+| `get tz.offset`, `set tz.offset 2` | Time zone, in hours from UTC |
+| `get lat`, `set lat …`, `get lon`, `set lon …` | The fixed position |
+| `ver`, `board` | Firmware version, hardware |
+| `reboot`, `poweroff` | Restart or turn off |
+
+Every other setting has a key: `keys` lists them a page at a time (`keys 2`,
+`keys 3` …). `get` shows a value as the Settings screen does, and `set`
+takes it the same way, case ignored:
+
+```
+get telemetry.base     > Nobody
+set telemetry.base Allowed
+set display.off 30 s
+set advert.loc on
+set autoadd.room off
+```
+
+A number works too: the position in the list (`set telemetry.base 2`), or a
+stored value such as seconds or millivolts (`set display.off 60`,
+`set batt.shutdown 3300`). A wrong value answers with the ones that fit.
+Factory reset and the node's keys are not in the console.