chore(release): bump version to 4.12.1 (hotfix) (#3807)

Hotfix for #3804: migration 103 UNIQUE-constraint startup crash when upgrading
to 4.12.0 with MQTT channel permissions (fix merged in #3805). Bumps all five
version files and adds the [4.12.1] CHANGELOG entry.


Claude-Session: https://claude.ai/code/session_011JEaCGwY9Wz8jeV4e22GW4

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: Yeraze

CHANGELOG.md

@@ -6,6 +6,11 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## [Unreleased]
 
+## [4.12.1] - 2026-06-27
+
+### Fixed
+- **Startup crash upgrading to 4.12.0 (migration 103)** — On installs with MQTT channel permissions, migration 103 could fail with `UNIQUE constraint failed: channel_database_permissions.user_id, channel_database_permissions.channel_database_id` and crash the app on every start. When consolidating duplicate MQTT channels, the migration now deletes conflicting permission rows before reassigning them to the keeper channel (all three backends; MySQL uses a derived-table subselect). (#3804, #3805)
+
 ## [4.12.0] - 2026-06-26
 
 ### Added

desktop/package.json

@@ -1,7 +1,7 @@
 {
   "name": "meshmonitor-desktop",
   "private": true,
-  "version": "4.12.0",
+  "version": "4.12.1",
   "type": "module",
   "scripts": {
     "tauri": "tauri",

desktop/src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "MeshMonitor",
-  "version": "4.12.0",
+  "version": "4.12.1",
   "identifier": "org.meshmonitor.desktop",
   "build": {
     "beforeBuildCommand": "",

helm/meshmonitor/Chart.yaml

@@ -2,8 +2,8 @@ apiVersion: v2
 name: meshmonitor
 description: A Helm chart for MeshMonitor - Web application for monitoring Meshtastic mesh networks
 type: application
-version: 4.12.0
-appVersion: "4.12.0"
+version: 4.12.1
+appVersion: "4.12.1"
 home: https://github.com/Yeraze/meshmonitor
 sources:
   - https://github.com/Yeraze/meshmonitor

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "meshmonitor",
-  "version": "4.12.0",
+  "version": "4.12.1",
   "description": "Web application for monitoring Meshtastic nodes over IP",
   "license": "BSD-3-Clause",
   "private": true,