fix(rendering): checkpoint main-character recovery and visual regression work

Handle late main-character data, guarded model construction, bounded retries and map correction. Validate player model sources and add lifecycle and real-asset visual regressions.

Include pending material and character-selection changes, updated A1 screenshot, and the detailed rendering repair plan. Hair occlusion, full UI parity and final macOS package acceptance remain unfinished.

project/ui/char_select_screen.gd

@@ -305,9 +305,8 @@ func _rebuild_model() -> void:
 		# Expansion armor textures live beside their GR2, outside the base PC pack.
 		var body_path := String(pv.model.get("gr2_path"))
 		pv.model.set("texture_dir", body_path.get_base_dir())
-		# Shape zero uses the head/hair already included in the armor mesh.
-		if int(c.get("hair_part", 0)) == 0:
-			pv.model.set("hair_gr2", "")
+		pv.model.set("lod_enabled", false)
+		pv.model.set("flip_winding", true)
 		pv._ground_model()
 		var intro := pv.motion_dir.get_base_dir().path_join("intro/wait.msa")
 		if pv.anim and FileAccess.file_exists(intro):

project/ui/player_view.gd

@@ -29,7 +29,7 @@ var _forward := ["weapon_gr2", "shield_gr2", "gr2_path", "hair_gr2", "hair_skin"
 # 它（= M2Client.net_poll），免得整段阻塞几秒漏 PONG 被服务器踢。
 func build(assets_root: String, race: int, pump := Callable()) -> bool:
 	_assets_root = assets_root
-	if not ClassDB.class_exists("Metin2Model"):
+	if race < 0 or race > 7 or not ClassDB.class_exists("Metin2Model"):
 		return false
 	var cls: String = CLASS_OF[race & 3]
 	var pc_dir := "pc2/ymir work/pc2/%s" % cls if race in FEMALE_RACES else "PC/ymir work/pc/%s" % cls
@@ -46,9 +46,18 @@ func build(assets_root: String, race: int, pump := Callable()) -> bool:
 	model.set("texture_dir", base)
 	if pump.is_valid(): pump.call()
 	var body := _first_existing([base.path_join("%s_novice.gr2" % cls), base.path_join("%s.gr2" % cls)])
-	if body != "":
-		model.set("gr2_path", body)         # 重：解 gr2 + 建网格 + 扫 3 级 LOD
-		if pump.is_valid(): pump.call()
+	if body == "":
+		model.free()
+		model = null
+		return false
+	model.set("gr2_path", body)         # 重：解 gr2 + 建网格 + 扫 3 级 LOD
+	# This view is built off-tree: set_gr2_path only stores the path until ready.
+	# Validate the source explicitly rather than reading a not-yet-loaded report.
+	if String(model.call("probe_gr2", body)).contains("FAILED"):
+		model.free()
+		model = null
+		return false
+	if pump.is_valid(): pump.call()
 	var hair := _first_existing([base.path_join("hair/hair_1_1.gr2"), base.path_join("hair/hair_01.gr2")])
 	if hair != "":
 		model.set("hair_gr2", hair)         # 重：解 hair gr2 + 折进网格