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_markup_renderer.hpp

@@ -47,15 +47,6 @@ public:
     void render(const std::vector<ChatSegment>& segments,
                 const ImVec4& baseColor,
                 const MarkupRenderContext& ctx) const;
-
-    /**
-     * Render a full item tooltip for the given item entry.
-     * Extracted from the renderItemLinkTooltip inline lambda.
-     */
-    static void renderItemTooltip(uint32_t itemEntry,
-                                  game::GameHandler& gameHandler,
-                                  InventoryScreen& inventoryScreen,
-                                  pipeline::AssetManager* assetMgr);
 };
 
 } // namespace ui