fix: Group NPC — embed weapons/armor/abilities on created actors

- Weapon items created as embedded weapon Items with proper schema
  (melee vs ranged category, damage, AP, range, ROF from note field)
- Armor items created for NPCs with armour description (skips
  Built-in for machines — they use the armor stat directly)
- Ability items created as specialty Items showing in Stats tab
- Biography formatted with armour, weapons, abilities sections

- Card backgrounds now tinted by type colour (very subtle 7% opacity)
  so Carrion/Gang/Monstaret/Machine are visually distinct at a glance

- Count selector replaced with number input (1–10) instead of dropdown

system.json

@@ -2,7 +2,7 @@
   "id": "zero-engine",
   "title": "Zero Engine (SLA Industries)",
   "description": "A basic game system for SLA Industries using the Zero Engine rules.",
-  "version": "1.5.3",
+  "version": "1.5.4",
   "compatibility": {
     "minimum": 13,
     "verified": "14.359"