add long-press gesture for touch-friendly preset popup

- replace instant drag-on-press with 500ms long-press timer
- cancel long-press on early release or movement past 10px threshold
- preserve double-click for mouse users (backward compatible)
- resize edge detection still instant (no long-press)
- cancel long-press on mouse_exit and grid rebuild
- fix: ConfigFile reserved word 'default' removed from config

scripts/dashboard_grid.gd

@@ -56,6 +56,14 @@ const EDGE_RIGHT: int = 2
 const EDGE_TOP: int = 4
 const EDGE_BOTTOM: int = 8
 
+# Long-press gesture — used as a touch-friendly alternative to double-click
+const LONG_PRESS_TIME: float = 0.5
+const LONG_PRESS_DRAG_THRESHOLD: float = 10.0
+
+var _long_press_timer: Timer = null
+var _long_press_pos: Vector2 = Vector2.ZERO
+var _long_press_active: bool = false
+
 
 func _ready() -> void:
 	mouse_filter = Control.MOUSE_FILTER_STOP
@@ -66,6 +74,8 @@ func _ready() -> void:
 
 
 func _on_mouse_exited() -> void:
+	if _long_press_active:
+		_cancel_long_press()
 	if _is_dragging:
 		if _drag_module != null:
 			_drag_module.modulate = Color(1, 1, 1, 1)
@@ -81,23 +91,33 @@ func _on_gui_input(event: InputEvent) -> void:
 	if event is InputEventMouseButton:
 		var mb: InputEventMouseButton = event
 		if mb.button_index == MOUSE_BUTTON_LEFT and mb.double_click and mb.pressed:
+			# Double-click still works for mouse users
 			_show_preset_popup(mb.position)
 		elif mb.button_index == MOUSE_BUTTON_LEFT and not mb.double_click:
 			if mb.pressed:
+				# Try resize edge first (instant, no long-press)
 				if not _try_begin_resize(mb.position):
-					_begin_drag(mb.position)
-			elif _is_resizing:
-				_end_resize(mb.position)
-			elif _is_dragging:
-				_end_drag(mb.position)
+					# Not on an edge — start long-press gesture
+					_start_long_press(mb.position)
+			else:
+				_cancel_long_press()
+				if _is_resizing:
+					_end_resize(mb.position)
+				elif _is_dragging:
+					_end_drag(mb.position)
 
 	elif event is InputEventMouseMotion:
+		var mm: InputEventMouseMotion = event
 		if _is_resizing:
-			_update_resize(event.position)
+			_update_resize(mm.position)
 		elif _is_dragging:
-			_update_drag(event.position)
+			_update_drag(mm.position)
+		elif _long_press_active:
+			if (mm.position - _long_press_pos).length_squared() > LONG_PRESS_DRAG_THRESHOLD * LONG_PRESS_DRAG_THRESHOLD:
+				_cancel_long_press()
+				_begin_drag(mm.position)
 		else:
-			_update_hover_cursor(event.position)
+			_update_hover_cursor(mm.position)
 
 
 func _show_preset_popup(mouse_pos: Vector2) -> void:
@@ -129,6 +149,37 @@ func _show_preset_popup(mouse_pos: Vector2) -> void:
 	popup.id_pressed.connect(on_select)
 
 
+# --------------------------------------------------------------------------
+# Long-press gesture (touch-friendly popup trigger)
+# --------------------------------------------------------------------------
+
+func _start_long_press(pos: Vector2) -> void:
+	_cancel_long_press()
+	_long_press_pos = pos
+	_long_press_active = true
+	_long_press_timer = Timer.new()
+	_long_press_timer.name = "LongPressTimer"
+	_long_press_timer.one_shot = true
+	_long_press_timer.wait_time = LONG_PRESS_TIME
+	_long_press_timer.timeout.connect(_on_long_press_timeout)
+	add_child(_long_press_timer)
+	_long_press_timer.start()
+
+
+func _cancel_long_press() -> void:
+	_long_press_active = false
+	if _long_press_timer != null:
+		if _long_press_timer.is_inside_tree():
+			_long_press_timer.queue_free()
+		_long_press_timer = null
+
+
+func _on_long_press_timeout() -> void:
+	_long_press_active = false
+	_long_press_timer = null
+	_show_preset_popup(_long_press_pos)
+
+
 # --------------------------------------------------------------------------
 # Public API
 # --------------------------------------------------------------------------
@@ -603,6 +654,8 @@ func _highlight_cell(col: int, row: int, highlighted: bool) -> void:
 # --------------------------------------------------------------------------
 
 func _rebuild_grid() -> void:
+	if _long_press_active:
+		_cancel_long_press()
 	if _is_dragging:
 		_cancel_drag()
 	if _is_resizing: