Deal items on ready, /pvp, and calmer rival windows

- Readying in a countdown deals any empty slots at random right away,
  and the countdown reads "Starting..." once everyone is ready.
- /pvp toggles PvP in the sandbox, offline or in a lobby.
- Rival windows sit at half opacity (half again when knocked out, and
  when hovered), show no item tooltips, and drop to small icons past
  two full-size rows.

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

src/match.cpp

@@ -140,14 +140,17 @@ void Match::update(Sim& sim)
             break;
         case MATCH_COUNTDOWN:
         {
-            // Ready sticks once pressed, and bots always are. Once everyone is, the wait drops to its last second.
-            // Fighters choosing items pick them through their controls.
+            // Ready sticks once pressed, and bots always are. Readying deals any slots still empty at random. Once
+            // everyone is, the wait drops to its last second. Fighters choosing items pick them through their controls.
             bool isEveryone = true;
             for (int i = 0; i < sim.fighterCount; i++)
             {
                 Fighter& fighter = sim.fighters[i];
                 edit_take(sim, fighter);
+                bool wasReady = isReady[i];
                 isReady[i] |= fighter.isBot || fighter.is_down(CONTROL_READY);
+                if (isReady[i] && !wasReady)
+                    loadout_deal(sim, i);
                 isEveryone &= isReady[i];
             }
             if (isEveryone)
@@ -421,20 +424,31 @@ void Match::mirror_copy(Sim& sim, bool isTrinket)
     }
 }
 
-// The countdown is over: slots still empty after choosing are dealt at random (once, and shared, when mirrored), and
-// the menu closes.
+// Deals a fighter's empty slots at random. A mirrored kind is dealt only to the first fighter, and copied to everyone.
+void Match::loadout_deal(Sim& sim, int index)
+{
+    Fighter& fighter = sim.fighters[index];
+    for (int kind = 0; kind < 2; kind++)
+    {
+        bool isTrinket = kind == 1;
+        ItemRules& items = isTrinket ? rules.trinkets : rules.weapons;
+        if (items.isMirror && index > 0)
+            continue;
+        if (isTrinket)
+            picks_deal(sim.rng, fighter.trinketLoadout, fighter.trinketSlots, TRINKET_COUNT, items.isDuplicates);
+        else
+            picks_deal(sim.rng, fighter.weaponLoadout, fighter.weaponSlots, WEAPON_COUNT, items.isDuplicates);
+        if (items.isMirror)
+            mirror_copy(sim, isTrinket);
+    }
+}
+
+// The countdown is over: slots still empty after choosing (by anyone who never readied) are dealt at random, and the
+// menu closes.
 void Match::fight_start(Sim& sim)
 {
     for (int i = 0; i < sim.fighterCount; i++)
-    {
-        Fighter& fighter = sim.fighters[i];
-        picks_deal(sim.rng, fighter.weaponLoadout, fighter.weaponSlots, WEAPON_COUNT, rules.weapons.isDuplicates);
-        picks_deal(sim.rng, fighter.trinketLoadout, fighter.trinketSlots, TRINKET_COUNT, rules.trinkets.isDuplicates);
-        if (i == 0 && rules.weapons.isMirror)
-            mirror_copy(sim, false);
-        if (i == 0 && rules.trinkets.isMirror)
-            mirror_copy(sim, true);
-    }
+        loadout_deal(sim, i);
     if (isWeaponPick || isTrinketPick)
         sim.cues->choice_close();
     isWeaponPick = false;