feat(voice-call): Improve socket connection and mic permission handling

lib/core/utils/android_assistant_handler.dart

@@ -1,3 +1,4 @@
+import 'dart:async';
 import 'dart:io';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
@@ -139,6 +140,16 @@ class AndroidAssistantHandler {
         return;
       }
 
+      // Pre-warm socket connection before navigating to voice call.
+      // This reduces the chance of "websocket not connected" errors when
+      // opening voice call right after app start or from Android assistant.
+      final socketService = _ref.read(socketServiceProvider);
+      if (socketService != null && !socketService.isConnected) {
+        // Start connection attempt in parallel, don't wait for full connection
+        // The VoiceCallService.startCall() will wait with extended timeout
+        unawaited(socketService.connect());
+      }
+
       // Navigate to chat if not already there
       final isOnChatRoute = NavigationService.currentRoute == Routes.chat;
       if (!isOnChatRoute) {