feat: UX polish, localization, advert relocation, and map filter fixes

- i18n: translate connection screen + chat tab keys into 13 locales;
  add "Send my contact" (advert) strings in all locales
- feat: move self-advert from home header into composer "+" action menu
  (new lib/utils/advert_helper.dart, always shows Flood/Direct sheet)
- fix: hide-repeaters map toggle was bypassed in simple mode
- fix: simple mode map now shows only favourite chat contacts
- fix: wrap ListTiles in Material (contact_tile secondary actions,
  inferred contact group card) to satisfy Flutter ink assertions
- device-authoritative contact/channel sync and UX review fixes

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

lib/l10n/app_zh.arb

@@ -2493,5 +2493,125 @@
   "enterRegionName": "区域名称（例如 auckland）",
   "noRegionsFound": "此中继器上未找到区域。",
   "regionScopeSet": "区域范围已设置为 {name}",
-  "regionScopeCleared": "区域范围已清除"
+  "regionScopeCleared": "区域范围已清除",
+  "simpleMode": "简单模式",
+  "simpleModeDescription": "仅与收藏联系人聊天和查看地图",
+  "simpleModeRequiresLockedDestination": "请先启用“锁定目的地”并选择一个频道，再使用简单模式",
+  "noFavouriteContacts": "暂无收藏联系人",
+  "selectDestinationFirst": "请先选择频道、联系人或房间",
+  "recipientNoLongerAvailable": "收件人已不可用",
+  "failedToSendMessage": "发送失败：{error}",
+  "tictactoeDirectOnly": "井字棋仅适用于私聊消息。请先选择联系人。",
+  "deviceKeyUnavailable": "设备密钥不可用",
+  "imageCompressionFailed": "图片压缩失败",
+  "imageFragmentationFailed": "图片分片失败",
+  "failedToAnnounceImage": "图片通告失败",
+  "noRecipientSelected": "未选择收件人",
+  "imageSendFailed": "图片发送失败",
+  "microphonePermissionRequiredForVoice": "语音消息需要麦克风权限",
+  "recordingDiscarded": "已丢弃录音",
+  "publicChannelMediaWarning": "您即将向公共频道发送{mediaType}。不建议这样做，因为 mesh 网络中的所有人都可能收到。除非确有需要，请选择私有或带标签的频道。",
+  "selectPrivateChannelToShareLocation": "请选择私有频道来分享您的位置。",
+  "stopSharingMyLocation": "停止分享我的位置",
+  "shareMyLocation": "分享我的位置",
+  "stopRecording": "停止录音",
+  "recordVoice": "录制语音",
+  "moreActions": "更多操作",
+  "noMessagesInFilter": "此筛选条件下没有消息",
+  "noMatchesInFilter": "此筛选条件下没有匹配项",
+  "syncFailed": "同步失败：{error}",
+  "invalidLink": "无效链接",
+  "cannotOpenLink": "无法打开链接",
+  "failedToOpenLink": "打开链接失败",
+  "failedToResendMessage": "重新发送消息失败",
+  "retryFailed": "重试失败：{error}",
+  "deleteDrawingAndMessage": "删除绘图和消息",
+  "lastEchoRelay": "最后回声：中继",
+  "lastEchoPath": "最后回声：路径",
+  "lastEchoBytesReport": "最后回声：字节报告",
+  "noGpsCoordinatesAvailable": "没有可用的 GPS 坐标",
+  "notASarMarker": "不是搜救标记",
+  "failedToSaveTemplate": "保存模板失败：{error}",
+  "drawingNotFound": "未找到绘图",
+  "unknownDrawingType": "未知绘图类型",
+  "customMapMarker": "自定义地图标记",
+  "customMapPointLabel": "坐标点：{point}",
+  "mapIdLabel": "地图 ID：{id}",
+  "cannotFetchVoice": "无法获取语音",
+  "senderContactUnknown": "发送者联系人未知。请先同步联系人。",
+  "senderRouteUnknown": "发送者路由未知。请先同步联系人/路径。",
+  "messageTooFar": "消息距离过远（{hops} 跳，最多 {maxHops} 跳）。",
+  "senderRouteNoPathResponse": "发送者路由未响应路径检测。请同步联系人/路径后重试。",
+  "senderRouteNoRawResponse": "发送者路由在原始传输路径上未响应。",
+  "voiceFetchOverHops": "通过 {hops} 跳获取语音可能需要一些时间。",
+  "voiceReceiveCanceled": "已取消接收语音",
+  "fetchingMissingVoiceFragments": "正在获取缺失的语音分片",
+  "receivingVoice": "正在接收语音",
+  "cannotFetchImage": "无法获取图片",
+  "imageFetchOverHops": "通过 {hops} 跳获取图片可能需要一些时间。",
+  "imageAlreadyBeingReceived": "图片正在接收中",
+  "loadImage": "加载图片",
+  "imageFetchFailedToSendRequest": "图片获取请求发送失败",
+  "imageUnavailable": "图片暂时不可用",
+  "imageFetchTimedOut": "图片获取超时",
+  "imageReceiveCanceled": "已取消接收图片",
+  "closeImagePreview": "关闭图片预览",
+  "recordingReleaseToSend": "正在录音……松开发送",
+  "sendingVoice": "正在发送语音……",
+  "sendLongPressToRecordVoice": "发送（长按录制语音）",
+  "discardRecording": "丢弃录音",
+  "hopCount": "{count, plural, other{{count} 跳}}",
+  "channelsSectionDescription": "用于附近 mesh 通信的广播频道",
+  "roomsSectionDescription": "用于团队持续协调的共享空间",
+  "contactsSectionDescription": "可直接联系的人员和设备",
+  "noRecentChatters": "最近没有人发言",
+  "public": "公共",
+  "failedToSendTicTacToeMove": "井字棋走子发送失败",
+  "youWon": "您赢了",
+  "opponentWon": "对手赢了",
+  "gameDraw": "平局",
+  "yourTurn": "轮到您",
+  "opponentTurn": "轮到对手",
+  "pleaseEnterValidCoordinates": "请输入有效坐标",
+  "locationNotAvailable": "位置不可用",
+  "customCaveMapPoint": "自定义洞穴地图点",
+  "mapPoint": "地图点",
+  "fetchingMissingImageFragments": "正在获取缺失分片……",
+  "loadingImage": "加载中……",
+  "receivingImage": "接收中……",
+  "tapToLoad": "点按加载",
+  "connectDevice": "连接设备",
+  "chooseTransportSubtitle": "选择 Bluetooth、WiFi 或串口传输",
+  "ble": "BLE",
+  "network": "网络",
+  "serial": "串口",
+  "scan": "扫描",
+  "pressScanToSearchForDevices": "点按扫描以搜索附近设备",
+  "failedToConnectToDevice": "连接 {name} 失败",
+  "unknownDevice": "未知设备",
+  "showingCachedResultsTapRefresh": "正在显示缓存结果。点按刷新以重新扫描。",
+  "scanningLocalNetworkOnPort": "正在扫描本地网络中端口 {port} 上的 MeshCore WiFi 设备",
+  "cancelScanAndAddServer": "取消扫描并添加服务器",
+  "addServer": "添加服务器",
+  "scanningProgressIps": "正在扫描……{scanned}/{total} 个 IP",
+  "cancelAndEnterManually": "取消并手动输入",
+  "noRecentOrDiscoveredServers": "暂无最近使用或发现的服务器",
+  "recentlyUsed": "最近使用",
+  "connecting": "正在连接……",
+  "discoveredOnThisNetwork": "在此网络中发现",
+  "serverNoLongerAvailable": "{host}:{port} 上的服务器已不可用。请重新扫描以查找活跃的服务器。",
+  "failedToConnectToHost": "连接 {host}:{port} 失败",
+  "enterValidIpAddress": "请输入有效的 IP 地址",
+  "enterValidTcpPort": "请输入有效的 TCP 端口",
+  "ipAddress": "IP 地址",
+  "tcpPort": "TCP 端口",
+  "customServerPort": "自定义服务器端口",
+  "chat": "聊天",
+  "restoringPreviousLink": "正在恢复先前的连接",
+  "noDeviceConnected": "未连接设备",
+  "sendAdvert": "发送我的联系人信息",
+  "advertMode": "发送我的联系人信息",
+  "advertModeSubtitle": "选择您的联系人信息应传播多远。",
+  "floodAdvertSent": "联系人信息已发送至整个 mesh 网络",
+  "directAdvertSent": "联系人信息已发送至附近设备"
 }