feat(battle-engine-port): M2 step 1 — SingleBattleMgr constructs headless

First green of the M2 go/no-go probe: `new SingleBattleMgr(StandardBattleMgr-
ContentsCreator)` now builds the two-player pair fully headless against the shim,
no Unity runtime. Verdict: headless construction is feasible; every blocker was a
mechanical no-op shim fill or data seam, not a Unity/logic wall.

Shim fills (authored):
- GameMgr: lazy non-null DataMgr/PrefabMgr/InputMgr/SoundMgr/BattleControl.
- GameObject: lazy cached component model so GetComponent<T>/AddComponent<T> return
  non-null no-op instances for Component-derived T (F1: unguarded view touches).
- Resources.Load(string): cached non-null GameObject so the prefab->Instantiate->
  GetComponent chain (UnityEventAgent) yields a real object.
- ClassBattleCardViewBase: re-attach dropped IClassBattleCardView (no-op members);
  ClassBattleCardBase.Setup casts the created view to it.

Engine copy (DP1/DP3 mis-cut fix):
- CardIconControl.cs copied verbatim (manifested) + generated null-stub deleted.
  SplitAndCompleteIconStr is pure string logic on the resolution path that M1 had
  wrongly stubbed as "View" -> null deref in SkillCreator.CreateBuildInfo.

Test harness (SVSim.BattleEngine.Tests, authored fixture):
- HeadlessContentsCreator/HeadlessPhaseCreator: deterministic replica of the solo
  practice init (StandardBattleMgrContentsCreator + SingleBattlePhaseCreator) with
  no-op recovery/replay managers.
- HeadlessCardMaster: reflects the loader cards.json dump into CardMaster.
- HeadlessMasterData: minimal Data.Master (class-character list, empty collections)
  + Data.Load + player/enemy chara ids.
- ConstructionProbeTests.SingleBattleMgr_constructs_headless — GREEN.

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

SVSim.BattleEngine/Engine/Wizard.Battle.View/CardIconControl.cs

@@ -0,0 +1,54 @@
+using System;
+
+namespace Wizard.Battle.View;
+
+public class CardIconControl
+{
+	public static string[] SplitAndCompleteIconStr(string iconStr, string[] skillTypeStr)
+	{
+		int skillCount = skillTypeStr[0].Split(',').Length;
+		int num = 0;
+		if (skillTypeStr.Length > 1)
+		{
+			num = skillTypeStr[1].Split(',').Length;
+		}
+		if (iconStr == null)
+		{
+			string[] array = new string[2]
+			{
+				CompleteIconDefaultParam(skillCount),
+				null
+			};
+			if (num > 0)
+			{
+				array[1] = CompleteIconDefaultParam(num);
+			}
+			return array;
+		}
+		iconStr = iconStr.Replace(" ", "");
+		if (string.IsNullOrEmpty(iconStr))
+		{
+			string[] array2 = new string[2]
+			{
+				CompleteIconDefaultParam(skillCount),
+				null
+			};
+			if (num > 0)
+			{
+				array2[1] = CompleteIconDefaultParam(num);
+			}
+			return array2;
+		}
+		return iconStr.Split(new string[1] { "//" }, StringSplitOptions.RemoveEmptyEntries);
+	}
+
+	public static string CompleteIconDefaultParam(int skillCount)
+	{
+		string text = string.Empty;
+		for (int i = 0; i < skillCount; i++)
+		{
+			text = ((!string.IsNullOrEmpty(text)) ? (text + ",none") : "none");
+		}
+		return text;
+	}
+}