feat: implement dense-area meteor barrage, large-battle optimization, and direct fighter count input

src/styles/mobile.css

@@ -100,11 +100,6 @@
     padding-block: 9px;
   }
 
-  #app.match-live .team-size-number {
-    width: 64px;
-    min-width: 64px;
-  }
-
   #app.match-live .spawn-placement-option span {
     min-height: 36px;
     padding: 6px;

src/styles/overlay.css

@@ -462,21 +462,6 @@ legend {
   text-transform: uppercase;
 }
 
-.team-size-row {
-  display: flex;
-  align-items: center;
-  justify-content: space-between;
-  gap: 12px;
-}
-
-.team-size-number {
-  width: 88px;
-  min-width: 88px;
-  padding-inline: 10px;
-  text-align: center;
-  font-weight: 900;
-}
-
 label {
   color: #ead8ad;
   font-size: 0.92rem;
@@ -500,6 +485,73 @@ textarea {
   line-height: 1.45;
 }
 
+textarea[aria-invalid="true"] {
+  border-color: #d9a628;
+  box-shadow: 0 0 0 1px rgb(217 166 40 / 0.34);
+}
+
+.player-names-warning {
+  display: grid;
+  grid-template-columns: auto 1fr;
+  align-items: center;
+  gap: 4px 9px;
+  margin: 0;
+  border: 1px solid rgb(219 168 45 / 0.72);
+  border-radius: 8px;
+  padding: 10px;
+  background: linear-gradient(135deg, rgb(88 67 17 / 0.7), rgb(43 37 19 / 0.92));
+  box-shadow: inset 3px 0 0 #dba82d;
+  line-height: 1.35;
+}
+
+.player-names-warning[hidden] {
+  display: none;
+}
+
+.player-names-warning__badge {
+  grid-row: span 2;
+  align-self: start;
+  color: #f4bd37;
+  font-size: 1.2rem;
+  font-weight: 900;
+  line-height: 1;
+}
+
+.player-names-warning__title {
+  color: #ffd565;
+  font-size: 0.92rem;
+  font-weight: 900;
+}
+
+.player-names-warning__detail {
+  grid-column: 2;
+  margin: 0;
+  color: #f1dfaa;
+  font-size: 0.82rem;
+  font-weight: 500;
+}
+
+.player-names-warning__count {
+  color: #ffd04f;
+  font-size: 1rem;
+  font-weight: 900;
+}
+
+.player-names-warning__limit {
+  color: #f7e0a0;
+  font-size: 0.94rem;
+  font-weight: 900;
+}
+
+.player-names-warning__reason {
+  grid-column: 1 / -1;
+  margin: 5px 0 0;
+  border-top: 1px solid rgb(219 168 45 / 0.25);
+  padding-top: 7px;
+  color: #d7c489;
+  font-size: 0.76rem;
+}
+
 input[type="range"] {
   width: 100%;
   accent-color: #e3b24f;