feat: complete mobile UI implementation

project/inventory_ui_test.gd

@@ -97,8 +97,29 @@ func _run() -> void:
 	_ck(iv._drop_mouse_item({"window": 1, "cell": 6, "vnum": 27, "count": 3}, 8),
 		"mouse drop accepts inventory stack")
 	_ck(fc.moved.size() == 2 and fc.moved[1] == [1, 6, 1, 8, 3],
-		"mouse drop preserves attached stack count")
+			"mouse drop preserves attached stack count")
 
 	iv.close()
 	_ck(not iv.is_open(), "window closed")
+
+	# 移动端长按详情与数量输入：不依赖右键、悬停或 PC SpinBox 微小箭头。
+	ui.set_mobile_mode(true)
+	iv.set_mobile_mode(true)
+	iv.open()
+	var long_down := InputEventScreenTouch.new()
+	long_down.index = 31
+	long_down.pressed = true
+	long_down.position = Vector2(20, 20)
+	iv._on_cell_input(6, long_down)
+	await create_timer(0.65).timeout
+	_ck(iv._mobile_detail_dialog != null, "mobile long-press detail opens")
+	_ck(ui.top() == iv._mobile_detail_dialog, "detail is a modal window above inventory")
+	ui.close_top()
+	_ck(iv._mobile_detail_dialog == null, "mobile detail closes with back")
+	iv._ask_count("丢弃数量", 3, func(_amount): pass)
+	var count_dialog: Control = ui.top()
+	_ck(count_dialog != null and count_dialog.get_node_or_null("CountInput") is LineEdit,
+			"mobile count dialog uses numeric LineEdit")
+	ui.close_top()
+	iv.close()
 	ui.queue_free()