feat(heaps): extend heap visualizer and logic to support both min and max heap

[mhdnihas]

Changes

• Added a Heap Type selector, The selector allows users to choose between “Max Heap” and “Min Heap”.
• The heap visualization dynamically updates to display the current heap type, and inserted values now reflect the chosen heap type.

Before

• Only Max Heap was shown
• No option to switch heap type

After

• Dropdown is visible under Heaps tab
• Users can toggle between both heap types
• Visualization updates accordingly