port(m1): wave 6a — GameMgr setters, Tab MonoBehaviour, OpeningVfx members, Vfx stubs (838->772)

- GameMgr.Is{Network,AINetwork,Watch,Replay,Puzzle,AdminWatch}Battle: read-only => settable (CS0200, Matching/NetworkBattleManagerBase assign them).
- Tab : MonoBehaviour (inherits Object.name; CS1061 x8).
- OpeningVfx: static OpenningLogStep, ShowBattleUIImmediatelyVfx (NullVfx, F1 contract), nested WaitVoiceEndVfx (CS0117/0426 x14).
- Generated no-op stubs EffectBattleVfxBase/SkillEffectBattleVfx/FallToGroundVfx/ThinkIconShowVfx (: SequentialVfxPlayer chain), baseclauses reattached.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

SVSim.BattleEngine/Shim/View/SettingsUiStubs.cs

@@ -59,6 +59,11 @@ namespace Wizard.Battle.View.Vfx
     {
         protected OpeningVfx(BackGroundBase backGround) { }
         public abstract void RegisterOpeningVfx(ClassBattleCardBase playerClass, ClassBattleCardBase enemyClass);
+
+        public static string OpenningLogStep = "";
+        public static VfxBase ShowBattleUIImmediatelyVfx(BattlePlayerBase battlePlayerBase, bool fixDirection = false, bool isNewReplay = false, bool isBanmenkun = false) => NullVfx.Create();
+
+        public class WaitVoiceEndVfx : VfxBase { }
     }
 }