feat: 2.8 protobuf sync + LoRa region→preset compatibility map

Sync the vendored protobufs to 2.8 and implement the LoRa region→preset
compatibility feature (FromRadio.region_presets), gating the new 2.8
regions and presets behind connected-firmware support.

Protobuf sync holes:
- Regenerate the vendored .pb.swift from the 2.8 protobufs submodule.
- Handle the new meshBeaconApp PortNum (37) in the packet switch.
- Realign ModuleConfig.TrafficManagementConfig to its redesigned schema
  (the boolean/precision/hop-management fields were dropped in favor of
  five implicit-enable integers): update the proto<->entity mapping and the
  config view, removing the defunct precision-bits and hop-management UI.
  The SwiftData entity is left intact, so no migration is required.

LoRa region->preset map (per the firmware client spec):
- Decode FromRadio.region_presets into a per-region lookup
  (LoRaRegionPresetMap.decoded -> RegionPresetInfo), store it on
  AccessoryManager, and reset it on disconnect.
- LoRaConfig constrains the preset picker to the selected region's legal
  set, switches to the region's default when the current preset is illegal,
  and warns on licensed (ham) bands. Falls back to the full list when the
  map or region is absent, and only consults the map on 2.8 firmware.

Firmware gating:
- New 2.8 regions (ham / EU-narrow) and presets (lite / narrow / tiny) are
  hidden on radios reporting firmware < 2.8.0 via the RegionCodes /
  ModemPresets selectable(supports2_8:) helpers.

Docs:
- Add a developer page for the region-preset map, update the LoRa and
  Traffic Management user docs, add what's-new entries, and regenerate the
  in-app documentation bundle.

Tests: LoRaRegionPresetMap decoding and firmware-gating suites.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: thebentern

Localizable.xcstrings

@@ -14062,9 +14062,6 @@
     },
     "Bitrate" : {
 
-    },
-    "Bits" : {
-
     },
     "BLE" : {
       "localizations" : {
@@ -34069,12 +34066,6 @@
           }
         }
       }
-    },
-    "Exhaust Hop Position" : {
-
-    },
-    "Exhaust Hop Telemetry" : {
-
     },
     "Expanded" : {
 
@@ -40992,9 +40983,6 @@
           }
         }
       }
-    },
-    "Hop Management" : {
-
     },
     "Hops" : {
 
@@ -47160,6 +47148,9 @@
           }
         }
       }
+    },
+    "Licensed band" : {
+
     },
     "Licensed Operator" : {
       "localizations" : {
@@ -50472,9 +50463,15 @@
     },
     "Max Transmit Power" : {
 
+    },
+    "Maximum hop distance from the requestor at which direct NodeInfo responses are served from the local cache." : {
+
     },
     "Maximum packets allowed per node within the rate limit window." : {
 
+    },
+    "Maximum unknown/undecryptable packets per rate window before the source is dropped." : {
+
     },
     "Mesh activity update" : {
       "localizations" : {
@@ -52348,9 +52345,6 @@
           }
         }
       }
-    },
-    "Minimum hop distance from requestor before responding to NodeInfo requests." : {
-
     },
     "Minimum interval in seconds between position updates from the same node." : {
 
@@ -57511,9 +57505,6 @@
     },
     "NTP Server" : {
 
-    },
-    "Number of bits of precision for position deduplication (0-32)." : {
-
     },
     "Number of hops" : {
       "localizations" : {
@@ -57760,9 +57751,6 @@
           }
         }
       }
-    },
-    "Number of unknown packets before dropping from a node." : {
-
     },
     "Offline Node" : {
       "comment" : "A description of an offline node.",
@@ -64412,12 +64400,6 @@
           }
         }
       }
-    },
-    "Precision Bits" : {
-
-    },
-    "Preserve hop_limit for router-to-router traffic." : {
-
     },
     "Presets" : {
       "localizations" : {
@@ -71837,9 +71819,6 @@
           }
         }
       }
-    },
-    "Router Preserve Hops" : {
-
     },
     "Routes" : {
       "localizations" : {
@@ -78375,12 +78354,6 @@
           }
         }
       }
-    },
-    "Set hop_limit to 0 for relayed position broadcasts (own packets unaffected)." : {
-
-    },
-    "Set hop_limit to 0 for relayed telemetry broadcasts (own packets unaffected)." : {
-
     },
     "Set LoRa Region" : {
       "localizations" : {

Meshtastic/Accessory/Accessory Manager/AccessoryManager+FromRadio.swift

@@ -240,6 +240,17 @@ extension AccessoryManager {
 		}
 	}
 
+	/// Decode the region → legal-preset map the radio advertises during the
+	/// want_config handshake (2.8+). Stored on the AccessoryManager so the LoRa
+	/// config screen can constrain its preset picker to the selected region's
+	/// legal set. Older firmware never sends this; the map simply stays empty and
+	/// the UI falls back to its unconstrained behavior.
+	func handleRegionPresets(_ regionPresets: LoRaRegionPresetMap) {
+		let decoded = regionPresets.decoded()
+		loRaRegionPresets = decoded
+		Logger.services.info("✅ [handleRegionPresets] decoded \(decoded.count, privacy: .public) region(s) from \(regionPresets.groups.count, privacy: .public) preset group(s)")
+	}
+
 	func handleDeviceMetadata(_ metadata: DeviceMetadata) async {
 		// Note: moved firmware version check to be inline with connection process
 		guard let device = activeConnection?.device, let deviceNum = device.num else {

Meshtastic/Accessory/Accessory Manager/AccessoryManager.swift

@@ -183,6 +183,12 @@ class AccessoryManager: ObservableObject, MqttClientProxyManagerDelegate {
 	@Published var isInBackground: Bool = false
 	@Published var firmwareEdition: FirmwareEditions = .vanilla
 
+	/// Region → legal-preset lookup advertised by the connected radio during the
+	/// want_config handshake (FromRadio.region_presets, 2.8+). Empty when the
+	/// firmware predates the feature or hasn't sent it yet — callers must treat an
+	/// absent region (or an empty map) as "no constraint". Reset on disconnect.
+	@Published var loRaRegionPresets: [Config.LoRaConfig.RegionCode: RegionPresetInfo] = [:]
+
 	var activeConnection: (device: Device, connection: any Connection)?
 
 	/// Reference to the active discovery scan engine, if any
@@ -461,6 +467,7 @@ class AccessoryManager: ObservableObject, MqttClientProxyManagerDelegate {
 			self.isConnected = false
 			self.isConnecting = false
 			self.firmwareEdition = .vanilla
+			self.loRaRegionPresets = [:]
 		case .connecting, .communicating, .retrying:
 			self.isConnected = false
 			self.isConnecting = true
@@ -762,6 +769,8 @@ class AccessoryManager: ObservableObject, MqttClientProxyManagerDelegate {
 					await MeshPackets.shared.paxCounterPacket(packet: decodedInfo.packet)
 				case .mapReportApp:
 					Logger.mesh.info("[Map Report] packet received from \(packet.from.toHex(), privacy: .public)")
+				case .meshBeaconApp:
+					Logger.mesh.info("[Mesh Beacon] packet received from \(packet.from.toHex(), privacy: .public)")
 				case .UNRECOGNIZED:
 					Logger.mesh.info("[Unrecognized] packet received from \(packet.from.toHex(), privacy: .public)")
 				case .max:
@@ -811,6 +820,9 @@ class AccessoryManager: ObservableObject, MqttClientProxyManagerDelegate {
 		case .metadata(let metadata):
 			await handleDeviceMetadata(metadata)
 
+		case .regionPresets(let regionPresets):
+			handleRegionPresets(regionPresets)
+
 		case .deviceuiConfig:
 #if DEBUG
 			Logger.admin.info("🕸️ MESH PACKET received for deviceUIConfig UNHANDLED \((try? decodedInfo.packet.jsonString()) ?? "JSON Decode Failure", privacy: .public)")