chore(game-ui): extract GameScreen domains

- Extracted `GameScreen` functionality into dedicated UI domains
- Added new panels:
  - `action_bar_panel`
  - `combat_ui`
  - `social_panel`
  - `window_manager`
- Updated `game_screen` + CMakeLists.txt integration
- Added new headers and sources under ui and ui

include/ui/social_panel.hpp

@@ -0,0 +1,77 @@
+#pragma once
+
+#include <imgui.h>
+#include <vulkan/vulkan.h>
+#include <string>
+#include <vector>
+#include <cstdint>
+#include <functional>
+
+namespace wowee {
+namespace game { class GameHandler; }
+namespace pipeline { class AssetManager; }
+namespace ui {
+
+class ChatPanel;
+class SpellbookScreen;
+class InventoryScreen;
+
+/**
+ * Social panel manager (extracted from GameScreen)
+ *
+ * Owns all social/group-related rendering:
+ *   party frames, boss frames, guild roster, social/friends frame,
+ *   dungeon finder, who window, inspect window.
+ */
+class SocialPanel {
+public:
+    SocialPanel() = default;
+
+    // ---- Callback type for spell icon lookup (stays in GameScreen) ----
+    using SpellIconFn = std::function<VkDescriptorSet(uint32_t spellId, pipeline::AssetManager*)>;
+
+    // ---- Toggle booleans (written by slash commands / escape handler / keybinds / UI buttons) ----
+    bool showSocialFrame_ = false;   // O key toggles social/friends list
+    bool showGuildRoster_ = false;
+    bool showRaidFrames_ = true;     // F key toggles raid/party frames
+    bool showWhoWindow_ = false;
+    bool showDungeonFinder_ = false;
+    bool showInspectWindow_ = false;
+
+    // ---- Guild roster state ----
+    std::string selectedGuildMember_;
+    bool showGuildNoteEdit_ = false;
+    bool editingOfficerNote_ = false;
+    char guildNoteEditBuffer_[256] = {0};
+    int guildRosterTab_ = 0;         // 0=Roster, 1=Guild Info
+    char guildMotdEditBuffer_[256] = {0};
+    bool showMotdEdit_ = false;
+    char petitionNameBuffer_[64] = {0};
+    char addRankNameBuffer_[64] = {0};
+    bool showAddRankModal_ = false;
+
+    // ---- LFG state ----
+    uint8_t lfgRoles_ = 0x08;           // default: DPS (0x02=tank, 0x04=healer, 0x08=dps)
+    uint32_t lfgSelectedDungeon_ = 861;  // default: random dungeon (entry 861)
+
+    // ---- Public render methods ----
+    void renderPartyFrames(game::GameHandler& gameHandler,
+                           ChatPanel& chatPanel,
+                           SpellIconFn getSpellIcon);
+    void renderBossFrames(game::GameHandler& gameHandler,
+                          SpellbookScreen& spellbookScreen,
+                          SpellIconFn getSpellIcon);
+    void renderGuildRoster(game::GameHandler& gameHandler,
+                           ChatPanel& chatPanel);
+    void renderSocialFrame(game::GameHandler& gameHandler,
+                           ChatPanel& chatPanel);
+    void renderDungeonFinderWindow(game::GameHandler& gameHandler,
+                                   ChatPanel& chatPanel);
+    void renderWhoWindow(game::GameHandler& gameHandler,
+                         ChatPanel& chatPanel);
+    void renderInspectWindow(game::GameHandler& gameHandler,
+                             InventoryScreen& inventoryScreen);
+};
+
+} // namespace ui
+} // namespace wowee