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>

examples/companion_radio/ui-new/UITask.cpp

@@ -173,6 +173,7 @@ static const telemetry::Style L1_INFO      = { "\xc2\xb0", true,  false, 5 };
 #include "SensorPlaceholders.h"
 #include "../ui-core/UiCore.h"   // shared UI Core: history rings + unread models (MessagesScreen views them)
 #include "../ui-core/SettingsSchema.h"   // the settings both frontends share (SettingsScreen.h)
+#include "../ui-core/SettingsCli.h"      // and their companion CLI keys
 #include "SettingsScreen.h"
 #include "MessagesScreen.h"
 
@@ -4053,6 +4054,13 @@ void UITask::applySoundPrefs() {
 #endif
 }
 
+// The companion CLI's settings keys (ui-core/SettingsCli.h).
+bool UITask::cliCommand(const char* command, char* reply, int n) {
+  if (!settingscli::handle(*_core, command, reply, n)) return false;
+  _next_refresh = 0;   // a screen showing the value draws it anew
+  return true;
+}
+
 void UITask::setBuzzerVolumeLevel(uint8_t level) {
 #ifdef PIN_BUZZER
   if (_node_prefs == NULL) return;