Why can't we be friends

Update the UX to refer to structure direct chats as friends. The direct chats are pulled into their own tab in the space drawer.

The `UserDetailDialog` is also updated to check whether a direct chat already exists and if not ask to invite as friend.

![image](/uploads/67f13fa8558e704e0acaf7c60e135bbc/image.png)

src/neochatconnection.h

@@ -27,6 +27,16 @@ class NeoChatConnection : public Quotient::Connection
     Q_PROPERTY(QString deviceKey READ deviceKey CONSTANT)
     Q_PROPERTY(QString encryptionKey READ encryptionKey CONSTANT)
 
+    /**
+     * @brief The total number of notifications for all direct chats.
+     */
+    Q_PROPERTY(qsizetype directChatNotifications READ directChatNotifications NOTIFY directChatNotificationsChanged)
+
+    /**
+     * @brief Whether there is at least one invite to a direct chat.
+     */
+    Q_PROPERTY(bool directChatInvites READ directChatInvites NOTIFY directChatInvitesChanged)
+
     /**
      * @brief Whether NeoChat is currently able to connect to the server.
      */
@@ -79,6 +89,11 @@ public:
      */
     Q_INVOKABLE void createSpace(const QString &name, const QString &topic, const QString &parent = {}, bool setChildParent = false);
 
+    /**
+     * @brief Whether a direct chat with the user exists.
+     */
+    Q_INVOKABLE bool directChatExists(Quotient::User *user);
+
     /**
      * @brief Join a direct chat with the given user.
      *
@@ -86,6 +101,9 @@ public:
      */
     Q_INVOKABLE void openOrCreateDirectChat(Quotient::User *user);
 
+    qsizetype directChatNotifications() const;
+    bool directChatInvites() const;
+
     // note: this is intentionally a copied QString because
     // the reference could be destroyed before the task is finished
     QCoro::Task<void> setupPushNotifications(QString endpoint);
@@ -97,6 +115,8 @@ public:
 
 Q_SIGNALS:
     void labelChanged();
+    void directChatNotificationsChanged();
+    void directChatInvitesChanged();
     void isOnlineChanged();
     void passwordStatus(NeoChatConnection::PasswordStatus status);
     void userConsentRequired(QUrl url);