feat: Add new regions and modem presets

This commit introduces several new regions and corresponding modem presets to align with recent firmware updates.

-   Adds `EU_866`, `NARROW_868`, and `HAM_US433` regions.
-   Adds new modem presets: `LITE_FAST`, `LITE_SLOW`, `NARROW_FAST`, and `NARROW_SLOW`.
-   Updates the channel calculation logic to account for channel spacing, matching the firmware's behavior.
-   Sets the default modem preset automatically when a new region is selected.
-   Updates the protobuf submodule to the latest version.

Signed-off-by: James Rich <2199651+jamesarich@users.noreply.github.com>

feature/settings/src/main/kotlin/org/meshtastic/feature/settings/radio/component/LoRaConfigItemList.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2025 Meshtastic LLC
+ * Copyright (c) 2025-2026 Meshtastic LLC
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -14,7 +14,6 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
-
 package org.meshtastic.feature.settings.radio.component
 
 import androidx.compose.foundation.text.KeyboardActions
@@ -96,7 +95,16 @@ fun LoRaConfigScreen(viewModel: RadioConfigViewModel, onBack: () -> Unit) {
                     enabled = state.connected,
                     items = RegionInfo.entries.map { it.regionCode to it.description },
                     selectedItem = formState.value.region,
-                    onItemSelected = { formState.value = formState.value.copy { region = it } },
+                    onItemSelected = {
+                        val regionInfo = RegionInfo.fromRegionCode(it)
+                        formState.value =
+                            formState.value.copy {
+                                region = it
+                                if (regionInfo != null) {
+                                    modemPreset = regionInfo.defaultPreset
+                                }
+                            }
+                    },
                 )
                 HorizontalDivider()
                 SwitchPreference(