feat: add Shaman totem frame with element-colored duration bars

- Renders below pet frame, visible only for Shaman (class 7)
- Shows each active totem (Earth/Fire/Water/Air) with its spell name
  and a colored countdown progress bar
- Colored element dot (brown/red/blue/light-blue) identifies element
- Only rendered when at least one totem is active

include/ui/game_screen.hpp

@@ -283,6 +283,7 @@ private:
      * Render pet frame (below player frame when player has an active pet)
      */
     void renderPetFrame(game::GameHandler& gameHandler);
+    void renderTotemFrame(game::GameHandler& gameHandler);
 
     /**
      * Process targeting input (Tab, Escape, click)