feat(animation): 452 named constants, 30-phase character animation state machine

Add animation_ids.hpp/cpp with all 452 WoW animation ID constants (anim::STAND,
anim::RUN, anim::FIRE_BOW, ... anim::FLY_BACKWARDS, etc.), nameFromId() O(1)
lookup, and flyVariant() compact 218-element ground→FLY_* resolver.

Expand AnimationController into a full state machine with 20+ named states:
spell cast (directed→omni→cast fallback chain, instant one-shot release),
hit reactions (WOUND/CRIT/DODGE/BLOCK/SHIELD_BLOCK), stun, wounded idle,
stealth animation substitution, loot, fishing channel, sit/sleep/kneel
down→loop→up transitions, sheathe/unsheathe combat enter/exit, ranged weapons
(BOW/GUN/CROSSBOW/THROWN with reload states), game object OPEN/CLOSE/DESTROY,
vehicle enter/exit, mount flight directionals (FLY_LEFT/RIGHT/UP/DOWN/BACKWARDS),
emote state variants, off-hand/pierce/dual-wield alternation, NPC
birth/spawn/drown/rise, sprint aura override, totem idle, NPC greeting/farewell.

Add spell_defines.hpp with SpellEffect (~45 constants) and SpellMissInfo
(12 constants) namespaces; replace all magic numbers in spell_handler.cpp.

Add GAMEOBJECT_BYTES_1 to update field table (all 4 expansion JSONs) and wire
GameObjectStateCallback. Add DBC cross-validation on world entry.

Expand tools/_ANIM_NAMES from ~35 to 452 entries in m2_viewer.py and
asset_pipeline_gui.py. Add tests/test_animation_ids.cpp.

Bug fixes included:
- Stand state 1 was animating READY_2H(27) — fixed to SITTING(97)
- Spell casts ended freeze-frame — add one-shot release animation
- NPC 2H swing probe chain missing ATTACK_2H_LOOSE (polearm/staff)
- Chair sits (states 2/4/5/6) incorrectly played floor-sit transition
- STOP(3) used for all spell casts — replaced with model-aware chain

src/game/combat_handler.cpp

@@ -123,6 +123,9 @@ void CombatHandler::registerOpcodes(DispatchTable& table) {
                 addCombatText(CombatTextEntry::ABSORB, static_cast<int32_t>(envAbs), 0, false, 0, 0, victimGuid);
             if (envRes > 0)
                 addCombatText(CombatTextEntry::RESIST, static_cast<int32_t>(envRes), 0, false, 0, 0, victimGuid);
+            // Drowning damage → play DROWN one-shot on player
+            if (envType == 1 && dmg > 0 && owner_.emoteAnimCallback_)
+                owner_.emoteAnimCallback_(victimGuid, 131); // anim::DROWN
         }
         packet.skipAll();
     };
@@ -440,7 +443,7 @@ void CombatHandler::handleAttackerStateUpdate(network::Packet& packet) {
         lastMeleeSwingMs_ = static_cast<uint64_t>(
             std::chrono::duration_cast<std::chrono::milliseconds>(
                 std::chrono::system_clock::now().time_since_epoch()).count());
-        if (owner_.meleeSwingCallback_) owner_.meleeSwingCallback_();
+        if (owner_.meleeSwingCallback_) owner_.meleeSwingCallback_(0);
     }
     if (!isPlayerAttacker && owner_.npcSwingCallback_) {
         owner_.npcSwingCallback_(data.attackerGuid);
@@ -520,6 +523,17 @@ void CombatHandler::handleAttackerStateUpdate(network::Packet& packet) {
             addCombatText(CombatTextEntry::RESIST, static_cast<int32_t>(totalResisted), 0, isPlayerAttacker, 0, data.attackerGuid, data.targetGuid);
     }
 
+    // Fire hit reaction animation on the victim
+    if (owner_.hitReactionCallback_ && !data.isMiss()) {
+        using HR = GameHandler::HitReaction;
+        HR reaction = HR::WOUND;
+        if (data.victimState == 1) reaction = HR::DODGE;
+        else if (data.victimState == 2) reaction = HR::PARRY;
+        else if (data.victimState == 4) reaction = HR::BLOCK;
+        else if (data.isCrit()) reaction = HR::CRIT_WOUND;
+        owner_.hitReactionCallback_(data.targetGuid, reaction);
+    }
+
 }
 
 void CombatHandler::handleSpellDamageLog(network::Packet& packet) {