feat(homing): 设计器 MODIFIER 表单加 homing 字段，并补上期遗漏的 bounce 字段

bounce 自上期起一直掉在「其它(JSON)」逃生舱，违反 CLAUDE.md 字段化规范，
与 homing 同处 schema，一并补上。

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

addons/game_designer/spell_tab.gd

@@ -152,6 +152,8 @@ func _dynamic_schema() -> Array:
 			{"k": "spread_add", "l": "多发 spread_add", "w": "i", "d": 0, "opt": true},
 			{"k": "multicast", "l": "额外施法 multicast", "w": "i", "d": 0, "opt": true},
 			{"k": "pierce", "l": "穿透 pierce", "w": "i", "d": 0, "opt": true},
+			{"k": "bounce", "l": "弹跳 bounce", "w": "i", "d": 0, "opt": true},
+			{"k": "homing", "l": "归航 homing", "w": "f", "d": 0.0, "opt": true},
 			{"k": "heavy_cost", "l": "扣血 heavy_cost", "w": "i", "d": 0, "opt": true},
 			{"k": "mana_leech", "l": "击杀回蓝 mana_leech", "w": "i", "d": 0, "opt": true}]
 		2: return [