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/macro_evaluator.hpp

@@ -7,6 +7,7 @@
 #include <string>
 
 namespace wowee {
+namespace game { class GameHandler; }
 namespace ui {
 
 class IGameState;
@@ -46,5 +47,11 @@ private:
     IModifierState& modState_;
 };
 
+// Convenience free function — thin wrapper over MacroEvaluator.
+// Used by command modules (combat_commands, system_commands, target_commands).
+std::string evaluateMacroConditionals(const std::string& rawArg,
+                                      game::GameHandler& gameHandler,
+                                      uint64_t& targetOverride);
+
 } // namespace ui
 } // namespace wowee