Crop sprites — atlas art + four growable kinds

Replaces the procedural stem-and-circle draw with an ElvGames atlas-backed
Sprite2D. Crops now pick a per-kind 64×32 (or 80×32) sheet from
art/sprites/crops/ and slice cols 0..3 across the SOWN..READY stage range
(TILLED keeps the bare dirt rect). The plant sprite is anchored so its
bottom edge sits at the tile bottom, matching the tree convention.

Four kinds wired in: wheat, potato, corn, strawberry. The boot demo's
crop patch now plants one column per kind so all four show up in the
spring start state. Harvest outputs map: wheat/corn → grain,
potato/strawberry → vegetable.

Tooltip already capitalises crop_kind so 'Corn' / 'Strawberry' show
through with no UI change.

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