feat: Implement optimistic UI for agent availability toggle, add email and phone visibility toggles, and improve the logout process with immediate socket disconnection and best-effort API calls.

lib/features/agents/data/models/agent_profile.dart

@@ -196,6 +196,38 @@ class AgentProfile {
     return tags;
   }
 
+  AgentProfile copyWith({bool? isAvailable}) {
+    return AgentProfile(
+      id: id,
+      userId: userId,
+      firstName: firstName,
+      lastName: lastName,
+      headline: headline,
+      bio: bio,
+      avatar: avatar,
+      companyName: companyName,
+      phone: phone,
+      website: website,
+      city: city,
+      state: state,
+      country: country,
+      averageRating: averageRating,
+      totalReviews: totalReviews,
+      isVerified: isVerified,
+      isFeatured: isFeatured,
+      isActive: isActive,
+      isAvailable: isAvailable ?? this.isAvailable,
+      email: email,
+      agentType: agentType,
+      user: user,
+      fieldValues: fieldValues,
+      createdAt: createdAt,
+      legacySpecializations: legacySpecializations,
+      languages: languages,
+      serviceAreas: serviceAreas,
+    );
+  }
+
   factory AgentProfile.fromJson(Map<String, dynamic> json) {
     return AgentProfile(
       id: json['id'] as String,