전략평가 돋보기 기능 추가

frontend/src/styles/strategyEvaluation.css

@@ -244,10 +244,44 @@
   flex-shrink: 0;
 }
 
-.seval-chart-hint {
-  font-size: 0.66rem;
+.seval-chart-toolbar-actions {
+  display: flex;
+  align-items: center;
+  flex-shrink: 0;
+}
+
+.seval-chart-magnifier-btn {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 30px;
+  height: 30px;
+  padding: 0;
+  border: 1px solid var(--btd-divider, var(--se-border));
+  border-radius: 6px;
+  background: var(--btd-surface, var(--se-input-bg));
   color: var(--se-text-muted);
-  white-space: nowrap;
+  cursor: pointer;
+  flex-shrink: 0;
+  transition: background 0.12s, border-color 0.12s, color 0.12s;
+}
+
+.seval-chart-magnifier-btn:hover:not(:disabled) {
+  border-color: color-mix(in srgb, var(--btd-gold, var(--se-gold)) 45%, var(--se-border));
+  color: var(--btd-gold, var(--se-gold));
+  background: color-mix(in srgb, var(--btd-gold, var(--se-gold)) 10%, var(--se-input-bg));
+}
+
+.seval-chart-magnifier-btn--active {
+  border-color: color-mix(in srgb, var(--btd-gold, var(--se-gold)) 55%, var(--se-border));
+  color: var(--btd-gold, var(--se-gold));
+  background: color-mix(in srgb, var(--btd-gold, var(--se-gold)) 18%, var(--se-input-bg));
+  box-shadow: 0 0 0 1px color-mix(in srgb, var(--btd-gold, var(--se-gold)) 25%, transparent);
+}
+
+.seval-chart-magnifier-btn:disabled {
+  opacity: 0.4;
+  cursor: not-allowed;
 }
 
 /* btd-analysis-canvas-wrap--live: tv-chart-wrap 높이 (backtestDashboard.css) */
@@ -1621,9 +1655,3 @@ html.theme-light .seval-analyze-btn:hover:not(:disabled),
   border-color: rgba(25, 118, 210, 0.45);
   background: rgba(25, 118, 210, 0.08);
 }
-
-@media (max-width: 960px) {
-  .seval-chart-hint {
-    display: none;
-  }
-}