[Lobby] Add instant quick host to the game room (#7802)

* Add instant quick host to the game lobby

* Use a native pull-down on macOS and a split button elsewhere

- Gate on the active application style instead of the platform, so
  choosing Fusion on macOS still gets the split button: QMacStyle ignores
  autoRaise/flat and draws a QToolButton menu as a separate square.
- Rebuild the host control on QEvent::StyleChange, because the appearance
  settings switch styles while the room is open.
- Keep the review action, its arrow and the host button disabled while a
  host or join command is still in flight.
- Announce inline quick-host failures to screen readers.

* Address review findings

* Replace the macOS pull-down with a sibling settings button

QMacStyle has no split-button rendering: a menu-bearing QToolButton is drawn as a second square bezel. Keep the primary Host game button as the one-click quick host on every platform, and show a plain Game settings button as the secondary action on macOS instead; other styles keep the split arrow.

Rename the secondary action from "Review settings first..." to "Game settings..." so the label says what it opens, and update the shortcuts page label to match.

cockatrice/src/interface/widgets/server/game_selector.h

@@ -14,7 +14,11 @@
 class QTreeView;
 class GamesModel;
 class GamesProxyModel;
+class QLabel;
+class QMenu;
 class QPushButton;
+class QToolButton;
+class QAction;
 class AbstractClient;
 class TabSupervisor;
 class TabRoom;
@@ -64,6 +68,17 @@ private slots:
      */
     void actCreate();
 
+    /**
+     * @brief Creates a game immediately from the remembered settings, without a dialog.
+     */
+    void actQuickHost();
+
+    /**
+     * @brief Reports a failed quick-host request inline instead of as a modal box.
+     * @param response The server response to the create command.
+     */
+    void checkQuickHostResponse(const Response &response);
+
     /**
      * @brief Joins the currently selected game as a player.
      */
@@ -127,6 +142,15 @@ signals:
      */
     void gameJoined(int gameId);
 
+protected:
+    /**
+     * @brief Rebuilds the host control when the application style changes.
+     *
+     * The appearance settings can switch between the native macOS style and a
+     * cross-platform style while the room is open, and the host control follows.
+     */
+    void changeEvent(QEvent *event) override;
+
 private:
     AbstractClient *client;       /**< The network client used to communicate with the server. */
     TabSupervisor *tabSupervisor; /**< Reference to TabSupervisor for managing tabs and rooms. */
@@ -138,13 +162,20 @@ private:
 
     GameSelectorQuickFilterToolBar *quickFilterToolBar;
 
-    QPushButton *filterButton;               /**< Button to open the filter dialog. */
-    QPushButton *clearFilterButton;          /**< Button to clear active filters. */
-    QPushButton *createButton;               /**< Button to create a new game (only if room is set). */
-    QPushButton *joinButton;                 /**< Button to join the selected game. */
-    QPushButton *joinAsJudgeButton;          /**< Button to join the selected game as a judge. */
-    QPushButton *spectateButton;             /**< Button to spectate the selected game. */
-    QPushButton *joinAsJudgeSpectatorButton; /**< Button to join the selected game as a spectating judge. */
+    QPushButton *filterButton;                     /**< Button to open the filter dialog. */
+    QPushButton *clearFilterButton;                /**< Button to clear active filters. */
+    QPushButton *hostGameButton = nullptr;         /**< Host button, in the same family as the join buttons. */
+    QPushButton *hostGameSettingsButton = nullptr; /**< Opens the host form; a sibling button on macOS. */
+    QToolButton *hostGameMenuButton = nullptr;     /**< Split arrow that opens the host menu (non-macOS styles only). */
+    QWidget *hostGameButtonWidget = nullptr;       /**< Container that keeps the split button and its arrow together. */
+    QMenu *hostGameMenu = nullptr;                 /**< Menu behind the split arrow (non-macOS styles only). */
+    QAction *hostGameAction = nullptr;             /**< Quick-host action, carrying the keyboard shortcut. */
+    QAction *gameSettingsAction = nullptr;         /**< Opens the host form with the current settings. */
+    QLabel *hostErrorLabel;                        /**< Inline failure message for a quick-host request. */
+    QPushButton *joinButton;                       /**< Button to join the selected game. */
+    QPushButton *joinAsJudgeButton;                /**< Button to join the selected game as a judge. */
+    QPushButton *spectateButton;                   /**< Button to spectate the selected game. */
+    QPushButton *joinAsJudgeSpectatorButton;       /**< Button to join the selected game as a spectating judge. */
 
     const bool showFilters;  /**< Determines whether filter buttons are displayed. */
     GameTypeMap gameTypeMap; /**< Mapping of game types for the current room. */
@@ -152,6 +183,28 @@ private:
     QTimer filterSaveDebounceTimer; /**< Delays persisting quick-filter edits so typing does not rewrite the settings
                                        file on every keystroke. */
 
+    bool hostCommandPending = false; /**< True while a quick-host command is in flight. */
+    bool joinCommandPending = false; /**< True while a join/spectate command is in flight. */
+
+    /** @brief Shows a quick-host failure above the game list. */
+    void showHostError(const QString &message);
+    /** @brief Hides the quick-host failure message. */
+    void clearHostError();
+    /**
+     * @brief Rebuilds the host control for the active style.
+     *
+     * The primary button always quick-hosts. Every other style gets the split button,
+     * whose arrow opens the menu; the native macOS style has no split control, so it
+     * gets a plain sibling button for the secondary action instead.
+     */
+    void applyHostGameStyle();
+    /** @brief Marks a quick-host command as in flight or finished, then updates the host controls. */
+    void setHostCommandPending(bool pending);
+    /** @brief Applies the in-flight state of both host and join commands to the host controls. */
+    void updateHostControlsEnabled();
+    /** @brief Keeps the host control tooltips in sync with the current shortcut and style. */
+    void updateHostGameToolTip();
+
     /**
      * @brief Updates the widget title to reflect the current number of displayed games.
      *
@@ -222,6 +275,11 @@ public:
      */
     void retranslateUi();
 
+    /**
+     * @brief Re-reads the quick-host and review shortcuts after the user rebinds them.
+     */
+    void refreshShortcuts();
+
     /**
      * @brief Updates or adds a game entry in the list.
      * @param info The ServerInfo_Game object containing information about the game to update.