feat(mobile-next): 补齐语音未听红点、录音浮层与 50-60s 时限

按 B-187 打回修复 4.3/4.4 阻塞项，输入框与按住说话改用 searchBg。

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: multica-agent <github@multica.ai>

mobile-next/openim_common/lib/src/res/lang/en_US.dart

@@ -535,6 +535,8 @@ const Map<String, String> en_US = {
   "nWeek": "%s weeks",
   "nMonth": "%s months",
   "talkTooShort": "Talk too short",
+  "remainingRecordSeconds": "%s seconds left",
+  "autoSendMaxVoiceDuration": "Reached the 60-second limit, sent automatically",
   'quoteContentBeRevoked': 'Quote content be revoked',
   'tapTooShort': 'Tap too short',
   'createGroupTips': 'The group name cannot exceed 16 characters',

mobile-next/openim_common/lib/src/res/lang/zh_CN.dart

@@ -535,6 +535,8 @@ const Map<String, String> zh_CN = {
   "nWeek": "%s周",
   "nMonth": "%s个月",
   "talkTooShort": "说话时间太短",
+  "remainingRecordSeconds": "还可说 %s 秒",
+  "autoSendMaxVoiceDuration": "已达最长 60 秒，已自动发送",
   'quoteContentBeRevoked': '引用内容已被删除',
   'tapTooShort': '点击时间太短',
   'createGroupTips': '群名称不能超过16个字符',

mobile-next/openim_common/lib/src/res/strings.dart

@@ -1090,6 +1090,10 @@ class StrRes {
 
   static String get talkTooShort => 'talkTooShort'.tr;
 
+  static String get remainingRecordSeconds => 'remainingRecordSeconds'.tr;
+
+  static String get autoSendMaxVoiceDuration => 'autoSendMaxVoiceDuration'.tr;
+
   static String get quoteContentBeRevoked => 'quoteContentBeRevoked'.tr;
 
   static String get tapTooShort => 'tapTooShort'.tr;

mobile-next/openim_common/lib/src/res/styles.dart

@@ -12,7 +12,18 @@ class Styles {
   static Color c_FFFFFF = const Color(0xFFFFFFFF); // 警告色
   static Color c_18E875 = const Color(0xFF18E875); // 在线
   static Color c_F0F2F6 = const Color(0xFFF0F2F6); // 聊天页底部
+  static Color c_F2F3F5 = const Color(0xFFF2F3F5); // 搜索/输入框底 searchBg
   static Color c_000000 = const Color(0xFF000000); //
+
+  static Duration durationOverlay = const Duration(milliseconds: 150);
+  static Duration durationOverlaySwitch = const Duration(milliseconds: 100);
+
+  static bool Function(BuildContext) reduceMotion =
+      (BuildContext context) => MediaQuery.maybeOf(context)?.disableAnimations ?? false;
+
+  static Duration Function(BuildContext, Duration) motionOf =
+      (BuildContext context, Duration normal) => reduceMotion(context) ? Duration.zero : normal;
+
   static Color c_92B3E0 = const Color(0xFF92B3E0);
   static Color c_F2F8FF = const Color(0xFFF2F8FF); // 同步成功背景色
   static Color c_F8F9FA = const Color(0xFFF8F9FA); // 默认背景
@@ -264,6 +275,11 @@ class Styles {
     fontSize: 10.sp,
   );
 
+  static TextStyle ts_FFB300_12sp = TextStyle(
+    color: c_FFB300,
+    fontSize: 12.sp,
+  );
+
   static TextStyle ts_6085B1_17sp_medium = TextStyle(
     color: c_6085B1,
     fontSize: 17.sp,