refactor(chat): extract ItemTooltipRenderer, slim render(), consolidate utils

- Extract renderItemTooltip() (510 LOC) from ChatMarkupRenderer into
  dedicated ItemTooltipRenderer class; chat_markup_renderer.cpp 766→192 LOC
- Extract formatChatMessage(), detectChannelPrefix(), inputTextCallback()
  from render(); render() 711→376 LOC
- Consolidate replaceGenderPlaceholders() from 3 copies into
  chat_utils::replaceGenderPlaceholders(); remove 118 LOC duplicate from
  quest_log_screen.cpp, update 8 call sites in window_manager.cpp
- Delete chat_panel_commands.cpp (359 LOC) — absorb sendChatMessage,
  executeMacroText, PortBot helpers into chat_panel.cpp; move
  evaluateMacroConditionals to macro_eval_convenience.cpp
- Delete chat_panel_utils.cpp (229 LOC) — absorb small utilities into
  chat_panel.cpp
- Replace 3 forward declarations of evaluateMacroConditionals with
  #include "ui/chat/macro_evaluator.hpp"

Signed-off-by: Pavel Okhlopkov <pavel.okhlopkov@flant.com>

include/ui/chat/item_tooltip_renderer.hpp

@@ -0,0 +1,28 @@
+#pragma once
+
+#include <cstdint>
+
+namespace wowee {
+namespace game { class GameHandler; }
+namespace pipeline { class AssetManager; }
+namespace ui {
+
+class InventoryScreen;
+
+/**
+ * Renders a full WoW-style item tooltip via ImGui.
+ *
+ * Extracted from ChatMarkupRenderer::renderItemTooltip (Phase 6.7).
+ * Handles: item name/quality color, armor/DPS, stats, sockets, set bonuses,
+ * durability, sell price, required level, comparison tooltip.
+ */
+class ItemTooltipRenderer {
+public:
+    static void render(uint32_t itemEntry,
+                       game::GameHandler& gameHandler,
+                       InventoryScreen& inventoryScreen,
+                       pipeline::AssetManager* assetMgr);
+};
+
+} // namespace ui
+} // namespace wowee