Optional module block textures:

shield_projector.png - Shield Module block texture (registry id remains shield_projector)
shield_range_extender_off.png - Shield Range Extender texture while the linked shield is inactive
shield_range_extender_on.png - Shield Range Extender texture while the linked shield is active
shield_stabilizer.png - Shield Stabilizer block texture

The current block models use Minecraft wool placeholders. After adding these PNG files,
change the corresponding model JSON texture value from minecraft:block/... to:

shieldgrid:block/shield_projector
shieldgrid:block/shield_range_extender_off
shieldgrid:block/shield_range_extender_on
shieldgrid:block/shield_stabilizer
