Refuse a talent unless it outranks the held one with the same sub type

Test on dev (character Moo): with Enhanced Strength held, the client shaded
an Increased Strength runestone red and showed its refusal popup, but the
server applied it as a downgrade. The client's 0x4768D0 (ArcRuneTemplate
vtable slot 0x1E8) blocks a talent when a held talent with the same
rune_sub_type has an equal or higher rank, rank 0 included. AddRune's
rank-0 replace branch is never reached past that check.

Value changes vs the previous commit:
- Rank-0 stat runes are refused while any rank of their chain is held
  (same as the old DB type 4 block)
- Rank-0 talents in the same group (e.g. Bloodline sub-race runestones)
  are refused instead of replacing each other

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/engine/net/client/msg/ApplyRuneMsg.java

@@ -126,7 +126,8 @@ public class ApplyRuneMsg extends ClientNetMsg {
             return false;
         }
 
-        // Client 0x4695D0: a talent replaces a held one with the same sub type when its rank is 0 or higher
+        // Client 0x4768D0 refuses a talent unless its rank beats the held one with the same sub type (rank 0 included);
+        // AddRune (0x4695D0) then replaces the held talent
         CharacterRune replacedRune = null;
 
         if (rb.getRuneType() == mbEnums.RuneType.TALENT) {
@@ -145,7 +146,7 @@ public class ApplyRuneMsg extends ClientNetMsg {
             }
 
             if (replacedRune != null) {
-                if (rb.getRank() != 0 && rb.getRank() <= replacedRune.getRuneBase().getRank())
+                if (rb.getRank() <= replacedRune.getRuneBase().getRank())
                     return false;
             } else if (talentCount >= MAX_TALENTS)
                 return false;