fix(app): Phase B.2 — fix camera rotation offset + pass server MotionTableId to walk animation

Two fixes:

1. Camera side-view: AC character models face +Y in their default
   orientation, but our yaw convention has +X at yaw=0. Added a
   -PI/2 offset to the character's rotation so the model faces
   the actual walk direction. Camera was already correct — it was
   the model rotation that was 90 degrees off.

2. No walk animation: UpdatePlayerAnimation loaded the Setup
   directly from dats, but Setup.DefaultMotionTable is 0 for human
   characters — the real motion table comes from the server's
   PhysicsDescriptionFlag.MTable field in CreateObject. Without
   the override, GetIdleCycle returned null for every command.
   Now stores _playerMotionTableId from the spawn event and
   passes it as motionTableIdOverride to GetIdleCycle.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/AcDream.App/Rendering/GameWindow.cs

@@ -99,6 +99,7 @@ public sealed class GameWindow : IDisposable
     private bool _playerMode;
     private uint _playerServerGuid;
     private uint? _playerCurrentAnimCommand;
+    private uint? _playerMotionTableId;  // server-sent MotionTable override for the player's character
     // Accumulated mouse X delta for player turning; written in mouse-move
     // callback, consumed + reset in OnUpdate each frame.
     private float _playerMouseDeltaX;
@@ -776,6 +777,13 @@ public sealed class GameWindow : IDisposable
         // UpdateMotion / UpdatePosition events can reseat this entity by guid.
         _entitiesByServerGuid[spawn.Guid] = entity;
 
+        // Phase B.2: capture the server-sent MotionTableId for our own
+        // character so UpdatePlayerAnimation can pass it to GetIdleCycle.
+        // The Setup's DefaultMotionTable is often 0 for human characters;
+        // the real table comes from PhysicsDescriptionFlag.MTable.
+        if (spawn.Guid == _playerServerGuid && spawn.MotionTableId is not null)
+            _playerMotionTableId = spawn.MotionTableId;
+
         // Phase 6.4: register for per-frame playback if we resolved a real
         // cycle with a non-zero framerate and at least two frames in the
         // cycle (single-frame poses are static and don't need ticking).
@@ -1512,8 +1520,13 @@ public sealed class GameWindow : IDisposable
             if (_entitiesByServerGuid.TryGetValue(_playerServerGuid, out var pe))
             {
                 pe.Position = result.Position;
+                // AC character models face +Y in their default orientation.
+                // Our yaw convention has cos(yaw)=+X at yaw=0, so yaw=0
+                // means facing +X. Offset by -PI/2 so the model faces the
+                // actual walk direction (at yaw=0, model rotation = -PI/2
+                // = facing +X instead of the model's default +Y).
                 pe.Rotation = System.Numerics.Quaternion.CreateFromAxisAngle(
-                    System.Numerics.Vector3.UnitZ, _playerController.Yaw);
+                    System.Numerics.Vector3.UnitZ, _playerController.Yaw - MathF.PI / 2f);
             }
 
             // Update chase camera.
@@ -1801,7 +1814,13 @@ public sealed class GameWindow : IDisposable
 
         ushort cmdOverride = (ushort)(animCommand & 0xFFFFu);
         var cycle = AcDream.Core.Meshing.MotionResolver.GetIdleCycle(
-            ae.Setup, _dats, commandOverride: cmdOverride);
+            ae.Setup, _dats,
+            motionTableIdOverride: _playerMotionTableId,
+            commandOverride: cmdOverride);
+
+        Console.WriteLine($"[PLAYER-ANIM] cmd=0x{animCommand:X8} cmdOverride=0x{cmdOverride:X4} " +
+                          $"cycle={(cycle is null ? "NULL" : $"fr={cycle.Framerate:F1} low={cycle.LowFrame} high={cycle.HighFrame}")} " +
+                          $"setup=0x{pe.SourceGfxObjOrSetupId:X8} mtable=0x{(uint)ae.Setup.DefaultMotionTable:X8}");
 
         if (cycle is null || cycle.Framerate == 0f || cycle.HighFrame <= cycle.LowFrame) return;