Area-demolish: type+position mark keys — wires under machines (f851f8)

Card f851f8 — Kabel unter Maschinen-Footprint bleibt stehen

With the wire layer visible, a tile carries both Type.Machine and Type.Wire — but getHoverTargetType returned only the priority winner and FILE_MarkMap deduped by position alone, so wires under every footprint cell (not just the anchor) survived demolish.

Changes (Option B, Kai-agreed)

• getHoverTargetTypes() — collects all layers passing their own gate (pyramid, WireLayerActive, PlayerCraftedWall, foundation), old priority order.
• FILE_MarkMap flat composite keys "Type:X,Y" — all writers atomically converted, incl. the swap-move re-registration in removeMarkByIndex.
• tryMarkTile — one reach-check per tile, then per-type marks; conveyor refund gate only skips the conveyor (wire under a non-refundable belt now marks — flagged improvement).
• drawCenteredIcon + DrawGatheringProgress — optional TargetType param: wire marks center on their tile, machine marks on the anchor (back-compat for the 3 existing callers).

Verified: luajit per-file + lovec .syntaxchk 4056/0.