feat: add graphics quality presets system

Implement quick-access quality presets (Low, Medium, High, Ultra) that adjust multiple graphics settings at once for better user experience. Each preset configures:
- Shadow rendering and distance
- Anti-aliasing (MSAA) level
- Normal mapping and parallax mapping
- Ground clutter density

The system automatically detects when settings deviate from a preset and marks them as "Custom". Presets are persisted to settings.cfg for consistency across sessions. Users can quickly switch between performance and quality modes or tweak individual settings as needed.

include/ui/game_screen.hpp

@@ -143,6 +143,17 @@ private:
     bool pendingAMDFramegen = false;
     bool fsrSettingsApplied_ = false;
 
+    // Graphics quality presets
+    enum class GraphicsPreset : int {
+        CUSTOM = 0,
+        LOW = 1,
+        MEDIUM = 2,
+        HIGH = 3,
+        ULTRA = 4
+    };
+    GraphicsPreset currentGraphicsPreset = GraphicsPreset::CUSTOM;
+    GraphicsPreset pendingGraphicsPreset = GraphicsPreset::CUSTOM;
+
     // UI element transparency (0.0 = fully transparent, 1.0 = fully opaque)
     float uiOpacity_ = 0.65f;
     bool minimapRotate_ = false;
@@ -252,6 +263,8 @@ private:
     void renderTalentWipeConfirmDialog(game::GameHandler& gameHandler);
     void renderEscapeMenu();
     void renderSettingsWindow();
+    void applyGraphicsPreset(GraphicsPreset preset);
+    void updateGraphicsPresetFromCurrentSettings();
     void renderQuestMarkers(game::GameHandler& gameHandler);
     void renderMinimapMarkers(game::GameHandler& gameHandler);
     void renderQuestObjectiveTracker(game::GameHandler& gameHandler);