Simplify Table internals & enhance React integration

[shudv]

Simplify Table internals & enhance React integration

Summary

Simplifies Table implementation by removing complex incremental view updates in favor of straightforward memoization refresh, while enhancing the React useTable hook with automatic memoization management.

Changes

Core (Table.ts)

• 🗑️ Removed _applyViewUpdate incremental merge algorithm — replaced with simpler _refreshMemoization that rebuilds sorted arrays on change
• 🗑️ Removed _keyComparator helper and _allocateEmptyArray utility
• 🗑️ Removed default partition (__DEFAULT_PARTITION__) concept — partition() now requires explicit name
• ✨ Simplified entries() iterator to derive values from keys

React Integration (useTable.tsx)

• ✨ Added memo parameter (default: true) to control memoization
• ✨ Auto-memoizes table on mount, un-memoizes on unmount
  Tests
• ✅ Added lifecycle test suite verifying subscribe/memo called once on mount
• ✅ Added memoization test suite for opt-in/opt-out behavior
• 🔧 Reorganized existing tests into renders describe block

Demo

• 🎨 New simplified PerfApp for performance comparison
• 📸 Added demo GIF to README

Breaking Changes

• partition() no longer accepts empty call — must provide partition name