Implement comprehensive audio control panel with tabbed settings interface

Adds complete audio volume controls for all 11 audio systems with master volume. Reorganizes settings window into Video, Audio, and Gameplay tabs for better UX.

Audio Features:
- Master volume control affecting all audio systems
- Individual volume sliders for: Music, Ambient, UI, Combat, Spell, Movement, Footsteps, NPC Voices, Mounts, Activity sounds
- Real-time volume adjustment with master volume multiplier
- Restore defaults button per tab

Technical Changes:
- Added getVolumeScale() getters to all audio managers
- Integrated all 10 audio managers into renderer (UI, Combat, Spell, Movement added)
- Expanded game_screen.hpp with 11 pending volume variables
- Reorganized settings window using ImGui tab bars (Video/Audio/Gameplay)
- Audio settings uses scrollable child window for 11 volume controls
- Settings window expanded to 520x720px to accommodate comprehensive controls

include/audio/ambient_sound_manager.hpp

@@ -82,6 +82,7 @@ public:
 
     // Volume control
     void setVolumeScale(float scale);
+    float getVolumeScale() const { return volumeScale_; }
 
 private:
     struct AmbientEmitter {

include/audio/combat_sound_manager.hpp

@@ -23,6 +23,7 @@ public:
 
     // Volume control
     void setVolumeScale(float scale);
+    float getVolumeScale() const { return volumeScale_; }
 
     // Weapon swing sounds (whoosh sounds before impact)
     enum class WeaponSize {

include/audio/mount_sound_manager.hpp

@@ -42,6 +42,7 @@ public:
 
     bool isMounted() const { return mounted_; }
     void setVolumeScale(float scale) { volumeScale_ = scale; }
+    float getVolumeScale() const { return volumeScale_; }
 
 private:
     MountType detectMountType(uint32_t creatureDisplayId) const;

include/audio/movement_sound_manager.hpp

@@ -23,6 +23,7 @@ public:
 
     // Volume control
     void setVolumeScale(float scale);
+    float getVolumeScale() const { return volumeScale_; }
 
     // Character size (for water splash intensity)
     enum class CharacterSize {

include/audio/spell_sound_manager.hpp

@@ -23,6 +23,7 @@ public:
 
     // Volume control
     void setVolumeScale(float scale);
+    float getVolumeScale() const { return volumeScale_; }
 
     // Magic school types
     enum class MagicSchool {

include/audio/ui_sound_manager.hpp

@@ -12,10 +12,10 @@ class AssetManager;
 
 namespace audio {
 
-class UISoundManager {
+class UiSoundManager {
 public:
-    UISoundManager() = default;
-    ~UISoundManager() = default;
+    UiSoundManager() = default;
+    ~UiSoundManager() = default;
 
     // Initialization
     bool initialize(pipeline::AssetManager* assets);
@@ -23,6 +23,7 @@ public:
 
     // Volume control
     void setVolumeScale(float scale);
+    float getVolumeScale() const { return volumeScale_; }
 
     // Window sounds
     void playBagOpen();