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/chat_utils.hpp

@@ -1,14 +1,18 @@
 #pragma once
 
 #include "game/world_packets.hpp"
+#include "game/entity.hpp"
 #include <algorithm>
 #include <cctype>
+#include <memory>
 #include <string>
 
 namespace wowee {
 
-// Forward declaration
-namespace game { class GameHandler; }
+// Forward declarations
+namespace game {
+    class GameHandler;
+}
 
 namespace ui {
 namespace chat_utils {
@@ -38,6 +42,17 @@ inline std::string toLower(std::string s) {
     return s;
 }
 
+/**
+ * Replace $g/$G gender, $n/$N name, $c/$C class, $r/$R race,
+ * $p/$o/$s/$S pronoun, $b/$B linebreak, and |n linebreak placeholders.
+ * Extracted from ChatPanel::replaceGenderPlaceholders (Phase 6.6).
+ */
+std::string replaceGenderPlaceholders(const std::string& text,
+                                       game::GameHandler& gameHandler);
+
+/** Get display name for any entity (Player/Unit/GameObject). */
+std::string getEntityDisplayName(const std::shared_ptr<game::Entity>& entity);
+
 } // namespace chat_utils
 } // namespace ui
 } // namespace wowee