feat: improve battle notice system with expanded content, centralized constants, and fixed text wrapping

src/styles/game-ui.css

@@ -124,11 +124,12 @@
   display: flex;
   align-items: center;
   justify-content: center;
-  width: min(420px, 72vmin, calc(100vw - 64px));
+  width: auto;
+  max-width: min(640px, calc(100vw - 40px));
   min-height: 38px;
   border: 1px solid rgb(238 185 73 / 0.26);
   border-radius: 8px;
-  padding: 8px 14px;
+  padding: 8px 18px;
   background: rgb(8 10 7 / 0.68);
   color: #ffe8b4;
   font-size: 0.8rem;
@@ -136,6 +137,7 @@
   line-height: 1.35;
   text-align: center;
   text-shadow: 1px 1px 2px #000;
+  white-space: nowrap;
   opacity: 0;
   pointer-events: none;
   transform: translate(-50%, -10px);