feat: complete mobile UI implementation

project/ui/ui_profile.gd

@@ -0,0 +1,48 @@
+# UiProfile —— desktop / mobile presentation selection.
+#
+# The profile only selects presentation and input surfaces.  It must never
+# change the M2 protocol or gameplay rules.  Desktop developers can force the
+# mobile HUD with `--mobile-ui` (or the project setting below) without needing
+# an Android build.
+extends RefCounted
+
+enum Mode { AUTO, DESKTOP, MOBILE }
+
+const SETTING := "mt/ui/profile"
+const MOBILE_ARG := "--mobile-ui"
+const DESKTOP_ARG := "--desktop-ui"
+
+static func parse(value: String) -> int:
+	match value.strip_edges().to_lower():
+		"mobile":
+			return Mode.MOBILE
+		"desktop":
+			return Mode.DESKTOP
+		_:
+			return Mode.AUTO
+
+static func resolve(value: String = "") -> int:
+	var requested := value
+	if requested == "":
+		requested = String(ProjectSettings.get_setting(SETTING, "auto"))
+	var parsed := parse(requested)
+	if parsed != Mode.AUTO:
+		return parsed
+	for arg in OS.get_cmdline_args():
+		if arg == MOBILE_ARG:
+			return Mode.MOBILE
+		if arg == DESKTOP_ARG:
+			return Mode.DESKTOP
+	return Mode.MOBILE if OS.has_feature("mobile") else Mode.DESKTOP
+
+static func is_mobile(value: String = "") -> bool:
+	return resolve(value) == Mode.MOBILE
+
+static func name(mode: int) -> String:
+	match mode:
+		Mode.MOBILE:
+			return "mobile"
+		Mode.DESKTOP:
+			return "desktop"
+		_:
+			return "auto"