feat: add vertical drawing toolbar on market chart

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

manual_trading_hub/static/app.css

@@ -2833,10 +2833,77 @@ body.login-page {
 .market-chart-body {
   flex: 1;
   display: flex;
+  flex-direction: row;
   min-height: 0;
   position: relative;
 }
 
+.market-draw-toolbar {
+  flex: 0 0 40px;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 4px;
+  padding: 6px 4px;
+  border-right: 1px solid var(--border-soft);
+  background: var(--chart-bar-bg);
+  z-index: 4;
+  overflow-y: auto;
+}
+
+.market-draw-btn {
+  width: 32px;
+  height: 32px;
+  padding: 0;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  border: 1px solid transparent;
+  border-radius: 6px;
+  background: transparent;
+  color: var(--muted);
+  cursor: pointer;
+  flex-shrink: 0;
+}
+
+.market-draw-btn svg {
+  width: 18px;
+  height: 18px;
+}
+
+.market-draw-btn-text {
+  font-size: 0.82rem;
+  font-weight: 700;
+  font-family: var(--font);
+}
+
+.market-draw-btn:hover {
+  color: var(--text);
+  background: var(--inset-surface);
+  border-color: var(--border-soft);
+}
+
+.market-draw-btn.is-active {
+  color: var(--accent);
+  background: rgba(0, 255, 157, 0.1);
+  border-color: rgba(0, 255, 157, 0.35);
+}
+
+.market-draw-sep {
+  width: 22px;
+  height: 1px;
+  background: var(--border-soft);
+  margin: 2px 0;
+}
+
+.market-chart-main {
+  flex: 1;
+  min-width: 0;
+  height: 100%;
+  position: relative;
+  display: flex;
+}
+
 .market-chart-host {
   flex: 1;
   min-width: 0;
@@ -2844,6 +2911,17 @@ body.login-page {
   position: relative;
 }
 
+.market-draw-canvas {
+  position: absolute;
+  inset: 0;
+  z-index: 3;
+  pointer-events: none;
+}
+
+.market-draw-canvas.is-drawing {
+  cursor: crosshair;
+}
+
 .market-exchange-badge {
   position: absolute;
   left: 50%;