feat: smaller cells (10x10px) for higher detail

Cells reduced from 16x16 to 10x10 pixels. Same window size now
shows more of the world — finer detail, more cells visible.
Adaptive viewport recalculates grid_w/grid_h from new cell size.

109 tests, 0 failures

graphify-out/cache/semantic/69c78dcb576cc57ce585afbe4e5892e69e38732b9ee74e165a330bd71722991c.json

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