Skills: +-5 buttons, advanced skills use 50% of the attribute (creation.advanced_attr_percent)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HJhXuLD2Z6hv3Wqeq9UL9K

backend/app/derive.py

@@ -39,8 +39,9 @@ def compute(ch: dict, rules: dict) -> dict:
         unlocked = s["id"] in (ch.get("unlocked") or [])
         usable = s["type"] == "basic" or unlocked or prof_pip > 0  # advanced skills must be unlocked (a profession proficiency does it for free)
         best = max(attrs[a] for a in s["attrs"])  # with several attributes the higher one counts
+        base = best * cr.get("advanced_attr_percent", 100) // 100 if s["type"] == "advanced" else best  # advanced skills only use part of the attribute
         skills.append({**s, "points": pts, "prof": prof, "pips": pips, "usable": usable, "unlocked": unlocked,
-                       "total": best + pts + prof})
+                       "base": base, "total": base + pts + prof})
 
     aug_by_id = {a["id"]: a for a in rules["augments"]}
     chosen = [aug_by_id[i] for i in ch.get("augments", []) if i in aug_by_id]