fix(game-ui): 공통 Lumen 버튼 모양을 통일한다

상하단 이동·갱신 제어와 장수 목록, 토너먼트, 명령 선택을 공통 semantic button family로 연결한다.

고정 행은 공통 fixed-height 변형이 hover와 active 높이를 보정하게 하고 실제 Chromium geometry 회귀를 추가한다.

app/game-frontend/src/assets/styles/legacy-controls.css

@@ -144,7 +144,7 @@
 /*
  * Ref Bootstrap 5.2 + Lumen button family. This class owns the common raised
  * edge and pressed movement. Semantic modifiers below only select face, edge,
- * and text colors; width and fixed-height compensation stay with the owner.
+ * and text colors; width and the optional fixed-height value stay with the owner.
  * Existing semantic modifiers also opt in for backward compatibility.
  */
 .legacy-button:is(
@@ -173,6 +173,15 @@
     vertical-align: middle;
 }
 
+/*
+ * Top bars and other fixed rows keep their owner-provided height while using
+ * the same Lumen edge movement. Shrinking the box with the edge keeps its
+ * bottom coordinate fixed instead of moving the whole control down.
+ */
+.legacy-button.legacy-button--fixed-height {
+    height: var(--legacy-button-height);
+}
+
 .legacy-button.legacy-button--secondary {
     --legacy-button-bg: var(--sammo-button-secondary-bg);
     --legacy-button-border: var(--sammo-button-secondary-border);
@@ -213,6 +222,10 @@
     background: var(--legacy-button-bg);
 }
 
+.legacy-button.legacy-button--fixed-height:not(:disabled, [aria-disabled='true']):is(:hover, [aria-expanded='true']) {
+    height: calc(var(--legacy-button-height) - 1px);
+}
+
 .legacy-button:is(
         .legacy-button--lumen,
         .legacy-button--primary,
@@ -244,6 +257,10 @@
     box-shadow: none;
 }
 
+.legacy-button.legacy-button--fixed-height:not(:disabled, [aria-disabled='true']):active {
+    height: calc(var(--legacy-button-height) - 2px);
+}
+
 .legacy-button:is(
         .legacy-button--lumen,
         .legacy-button--primary,