Open trade detail in a modal dialog on row click.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/styles/app.css

@@ -584,6 +584,96 @@ input {
   font-size: 12px;
 }
 
+.trade-detail-hint {
+  color: var(--muted);
+  font-size: 13px;
+  margin: 0 0 12px;
+  line-height: 1.45;
+}
+
+.trade-pnl-block {
+  margin-top: 14px;
+  padding-top: 12px;
+  border-top: 1px solid var(--line);
+}
+
+.modal-backdrop {
+  position: fixed;
+  inset: 0;
+  z-index: 80;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: 16px;
+  padding-bottom: calc(16px + env(safe-area-inset-bottom, 0px));
+  background: rgba(0, 0, 0, 0.62);
+  backdrop-filter: blur(4px);
+}
+
+.modal-dialog {
+  width: min(560px, 100%);
+  max-height: min(86vh, 820px);
+  display: flex;
+  flex-direction: column;
+  background: var(--bg-elev);
+  border: 1px solid var(--line);
+  border-radius: 12px;
+  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.45);
+  overflow: hidden;
+}
+
+.modal-head {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 12px;
+  padding: 14px 16px;
+  border-bottom: 1px solid var(--line);
+  flex: 0 0 auto;
+}
+
+.modal-title {
+  margin: 0;
+  font-size: 16px;
+  font-weight: 700;
+  min-width: 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.modal-close {
+  flex: 0 0 auto;
+  min-height: 40px;
+}
+
+.modal-body {
+  padding: 14px 16px 18px;
+  overflow: auto;
+  -webkit-overflow-scrolling: touch;
+}
+
+@media (max-width: 900px) {
+  .modal-backdrop {
+    align-items: flex-end;
+    padding: 0;
+  }
+
+  .modal-dialog {
+    width: 100%;
+    max-height: min(88vh, 900px);
+    border-radius: 14px 14px 0 0;
+  }
+
+  .modal-head {
+    padding: 12px 14px;
+  }
+
+  .modal-body {
+    padding: 12px 14px calc(18px + env(safe-area-inset-bottom, 0px));
+  }
+}
+
 .trade-row-pnl {
   display: flex;
   flex-direction: column;