Juice Squeeze: fix irrational tile reordering across rows during drag

[Umanistan]

Summary

• Replace index-based row assignment (Math.floor(globalIndex / blocksPerRow)) with width-based greedy packing in reflowSentenceBlocks() for correct final layout after drop
• Use row-preserving grouping by existing sentenceRow in reflowSentenceBlocksAnimated() to prevent unrelated tiles from jumping between rows during drag preview
• Simplify calculateSentenceRows() and fix tap-to-place row-full check to use actual block widths instead of fixed counts
• Remove unused getSentenceBlocksPerRow() and associated constants

Problem

In multi-row phrases, dragging a tile from row 0 caused unrelated blocks from row 1 to irrationally jump up to row 0, scrambling the word order. This was caused by a fixed-count index-based row assignment algorithm that ignored actual block widths.

Test plan

• Test single-row phrases — drag and drop should work normally
• Test multi-row phrases — dragging a tile should NOT cause unrelated tiles to jump between rows
• Test RTL languages with multi-row phrases
• Test tap-to-place with full rows (should overflow to next row)
• Test on mobile (Android/iOS) layouts

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