chore: release version 2.3.5 and refactor lobby

Bump export_presets.cfg version to 2.3.5. Update CHANGELOG_DRAFT.md.
Refactor lobby.gd into LobbyChat, LobbyMainMenu, LobbyRoomList, LobbyRoom.
Move Nakama config to environment variables in nakama_manager.gd.
Derive auth_manager.gd encryption key from OS.get_unique_id().sha256_text().
Remove Steam email auth fallback. Require auth ticket.
Make GachaManager.pull() async in gacha_panel.gd.
Remove dummy wallet seeding. Add store_type to IAP payload.
Validate IAP receipts server-side in economy.lua.
Register gacha module in main.lua.
Clean backend_service.gd stubs.
Fix featured_banners type safety in gacha_manager.gd. Guards non-array responses.
Move tiles_armagedon_a1.res to assets/models/meshes/. Fix import fallback_path.

addons/gut/gui/run_from_editor.gd

@@ -0,0 +1,22 @@
+# ------------------------------------------------------------------------------
+# This is the entry point when running tests from the editor.
+#
+# This script should conform to, or ignore, the strictest warning settings.
+# ------------------------------------------------------------------------------
+extends Node2D
+
+var GutLoader : Object
+
+func _init() -> void:
+	GutLoader = load("res://addons/gut/gut_loader.gd")
+
+
+@warning_ignore("unsafe_method_access")
+func _ready() -> void:
+	_post_ready.call_deferred()
+
+
+func _post_ready():
+	var runner : Node = load("res://addons/gut/gui/GutRunner.tscn").instantiate()
+	get_tree().root.add_child(runner)
+	runner.run_from_editor()