Fix unit stopping when destination is occupied by another unit

When a unit arrived exactly MOVE_SPEED away from its destination, it would
move there via moveToward rather than snapping. On the next tick, its own
cell appeared blocked in the moveMap, triggering a repath to an adjacent
cell — causing infinite oscillation. Fix by excluding the unit's own current
cell from the blocked check before repathing. Also adds repath-to-adjacent
logic so units that arrive while the destination is genuinely occupied by
someone else settle next to it instead of stopping mid-journey.

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

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