Ethanfel 65253fd1bc fix: compute seam positions from actual tile grid ...

Replicate SplitImageToTileList's get_grid_coords logic to find real
overlap regions between adjacent tiles. Fixes three bugs:

1. Bands were at overlap start instead of center (off by overlap/2)
2. Spurious bands generated beyond the actual tile grid
3. Edge tile seams placed at wrong position (ignoring boundary shift)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-02-25 16:05:26 +01:00

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