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_panel.hpp

@@ -125,9 +125,6 @@ public:
     // UIServices injection (Phase B singleton breaking)
     void setServices(const UIServices& services) { services_ = services; }
 
-    /** Replace $g/$G and $n/$N gender/name placeholders in quest/chat text. */
-    std::string replaceGenderPlaceholders(const std::string& text, game::GameHandler& gameHandler);
-
     // ---- Accessors for command system (Phase 3) ----
     char* getChatInputBuffer() { return chatInputBuffer_; }
     size_t getChatInputBufferSize() const { return sizeof(chatInputBuffer_); }
@@ -203,7 +200,8 @@ private:
 
     // ---- Helpers ----
     void sendChatMessage(game::GameHandler& gameHandler);
-    // getChatTypeName / getChatTypeColor now static in ChatTabManager
+    static int inputTextCallback(ImGuiInputTextCallbackData* data);
+    void detectChannelPrefix(game::GameHandler& gameHandler);
 
     // Cached game handler for input callback (set each frame in render)
     game::GameHandler* cachedGameHandler_ = nullptr;