feat(sort): implement heapsort

[gian-gg]

Description

This PR adds full Heap Sort support to the sorting visualizer and introduces dual visualization modes (bars + tree) for Heap Sort.

Changes included:

• Added HeapSortPage with step-by-step Heap Sort animation (build max heap + extract max), playback controls, and live comparisons/swaps stats.
• Added Heap Sort route handling in src/App.tsx.
• Added/updated the Heap Sort metadata entry in src/algorithms/index.ts and marked it as implemented.
• Added a view toggle on the Heap Sort page to switch between Bars and Tree visualizations.
• Added HeapTreeVisualizer for heap-specific tree rendering with per-step node highlighting.
• Added reusable tree visualization components under src/components/algorithm/tree/ so other tree/heap algorithms can reuse the same primitives:
  • ArrayBinaryTreeCanvas (array-indexed binary tree layout + edge rendering)
  • TreeArrayStrip (array representation strip synced with node state)
  • shared tree types/exports (types.ts, index.ts)
• Updated SortingVisualizer header layout to better handle longer step descriptions.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have checked that my commit message follows conventional commits

Preview

Bars

heap-bars.mov

Tree

heap-tree.mov