feat: Add player action and input managers to handle player actions, movement, targeting, and visual feedback.

scripts/managers/player_action_manager.gd

@@ -71,16 +71,23 @@ func after_action_completed():
 # Highlight Operations
 # =============================================================================
 
-func highlight_cells_if_authorized(cells_to_highlight: Array):
+func highlight_cells_if_authorized(cells_to_highlight: Array, item_id: int = -1):
 	if not player.is_multiplayer_authority() or player.is_bot or player.is_in_group("Bots"):
 		return
 		
+	# Start with fresh highlights if logical state changes?
+	# But dragging mouse calls this every frame. We need to clear previous calls.
+	# The simplistic clear_highlights() clears ALL highlights. 
+	# Which is fine for targeting mode as we only highlight the target area.
 	clear_highlights()
+	
+	var highlight_item = item_id if item_id != -1 else enhanced_gridmap.hover_item
+	
 	for cell in cells_to_highlight:
 		highlighted_cells.append(cell)
 		enhanced_gridmap.set_cell_item(
 			Vector3i(cell.x, 0, cell.y),
-			enhanced_gridmap.hover_item
+			highlight_item
 		)
 
 func highlight_empty_adjacent_cells():