refactor(chat): decompose into modular architecture, add GM commands, fix protocol

- Extract ChatPanel monolith into 15+ focused modules under ui/chat/
  (ChatInput, ChatTabManager, ChatTabCompleter, ChatMarkupParser,
  ChatMarkupRenderer, ChatCommandRegistry, ChatBubbleManager,
  ChatSettings, MacroEvaluator, GameStateAdapter, InputModifierAdapter)
- Split 2700-line chat_panel_commands.cpp into 11 command modules
- Add GM command handling: 190-command data table, dot-prefix interception,
  tab-completion, /gmhelp with category filter
- Fix ChatType enum to match WoW wire protocol (SAY=0x01 not 0x00);
  values 0x00-0x1B shared across Vanilla/TBC/WotLK
- Fix BG_SYSTEM_* values from 82-84 (UB in bitmask shifts) to 0x24-0x26
- Fix infinite Enter key loop after teleport (disable TOGGLE_CHAT repeat,
  add 2-frame input cooldown)
- Add tests: chat_markup_parser, chat_tab_completer, gm_commands,
  macro_evaluator

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

include/game/world_packets.hpp

@@ -570,48 +570,52 @@ public:
 };
 
 /**
- * Chat message types
+ * Chat message types — wire values shared across Vanilla 1.12, TBC 2.4.3, and WotLK 3.3.5a.
+ * Core types (0x00–0x1B) are identical in all expansions.
+ * WotLK adds: ACHIEVEMENT(0x30), GUILD_ACHIEVEMENT(0x31), PARTY_LEADER(0x33).
  */
 enum class ChatType : uint8_t {
-    SAY = 0,
-    PARTY = 1,
-    RAID = 2,
-    GUILD = 3,
-    OFFICER = 4,
-    YELL = 5,
-    WHISPER = 6,
-    WHISPER_INFORM = 7,
-    EMOTE = 8,
-    TEXT_EMOTE = 9,
-    SYSTEM = 10,
-    MONSTER_SAY = 11,
-    MONSTER_YELL = 12,
-    MONSTER_EMOTE = 13,
-    CHANNEL = 14,
-    CHANNEL_JOIN = 15,
-    CHANNEL_LEAVE = 16,
-    CHANNEL_LIST = 17,
-    CHANNEL_NOTICE = 18,
-    CHANNEL_NOTICE_USER = 19,
-    AFK = 20,
-    DND = 21,
-    IGNORED = 22,
-    SKILL = 23,
-    LOOT = 24,
-    BATTLEGROUND = 25,
-    BATTLEGROUND_LEADER = 26,
-    RAID_LEADER = 27,
-    RAID_WARNING = 28,
-    ACHIEVEMENT = 29,
-    GUILD_ACHIEVEMENT = 30,
-    MONSTER_WHISPER = 42,
-    RAID_BOSS_WHISPER = 43,
-    RAID_BOSS_EMOTE = 44,
-    MONSTER_PARTY = 50,
-    // BG/Arena system messages (WoW 3.3.5a — no sender, treated as SYSTEM in display)
-    BG_SYSTEM_NEUTRAL  = 82,
-    BG_SYSTEM_ALLIANCE = 83,
-    BG_SYSTEM_HORDE    = 84
+    SYSTEM = 0x00,
+    SAY = 0x01,
+    PARTY = 0x02,
+    RAID = 0x03,
+    GUILD = 0x04,
+    OFFICER = 0x05,
+    YELL = 0x06,
+    WHISPER = 0x07,
+    WHISPER_FOREIGN = 0x08,
+    WHISPER_INFORM = 0x09,
+    EMOTE = 0x0A,
+    TEXT_EMOTE = 0x0B,
+    MONSTER_SAY = 0x0C,
+    MONSTER_PARTY = 0x0D,
+    MONSTER_YELL = 0x0E,
+    MONSTER_WHISPER = 0x0F,
+    MONSTER_EMOTE = 0x10,
+    CHANNEL = 0x11,
+    CHANNEL_JOIN = 0x12,
+    CHANNEL_LEAVE = 0x13,
+    CHANNEL_LIST = 0x14,
+    CHANNEL_NOTICE = 0x15,
+    CHANNEL_NOTICE_USER = 0x16,
+    AFK = 0x17,
+    DND = 0x18,
+    IGNORED = 0x19,
+    SKILL = 0x1A,
+    LOOT = 0x1B,
+    // 0x24–0x26: BG system messages
+    BG_SYSTEM_NEUTRAL  = 0x24,
+    BG_SYSTEM_ALLIANCE = 0x25,
+    BG_SYSTEM_HORDE    = 0x26,
+    RAID_LEADER = 0x27,
+    RAID_WARNING = 0x28,
+    RAID_BOSS_EMOTE = 0x29,
+    RAID_BOSS_WHISPER = 0x2A,
+    BATTLEGROUND = 0x2C,
+    BATTLEGROUND_LEADER = 0x2D,
+    ACHIEVEMENT = 0x30,
+    GUILD_ACHIEVEMENT = 0x31,
+    PARTY_LEADER = 0x33,
 };
 
 /**