add image to chat preview (#4888)

protocol/chat.go

@@ -243,6 +243,9 @@ type ChatPreview struct {
 	From             string `json:"from"`
 	Deleted          bool   `json:"deleted"`
 	DeletedForMe     bool   `json:"deletedForMe"`
+
+	// Image of the chat in Base64 format
+	Base64Image string `json:"image,omitempty"`
 }
 
 func (c *Chat) PublicKey() (*ecdsa.PublicKey, error) {

protocol/messenger_chats.go

@@ -76,6 +76,7 @@ func (m *Messenger) ChatsPreview() []*ChatPreview {
 				SyncedFrom:            chat.SyncedFrom,
 				Highlight:             chat.Highlight,
 				Members:               chat.Members,
+				Base64Image:           chat.Base64Image,
 			}
 
 			if chat.LastMessage != nil {