feat: collapse fund overview help and bind start day to env

Fold the stats description by default and render history_start_day and keep_days from the API so HUB_FUND_HISTORY_START_DAY in .env drives the UI.

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

manual_trading_hub/static/app.css

@@ -4501,9 +4501,38 @@ html[data-theme="light"] .funds-stage {
   border-color: rgba(0, 212, 255, 0.45);
   box-shadow: 0 0 18px rgba(0, 212, 255, 0.2);
 }
+.funds-desc-fold {
+  margin: 4px 0 0;
+  max-width: 100%;
+}
+.funds-desc-toggle {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  font-size: 0.72rem;
+  color: var(--accent);
+  cursor: pointer;
+  list-style: none;
+  user-select: none;
+  letter-spacing: 0.04em;
+}
+.funds-desc-toggle::-webkit-details-marker {
+  display: none;
+}
+.funds-desc-toggle::before {
+  content: "▸";
+  font-size: 0.68rem;
+  transition: transform 0.15s ease;
+}
+.funds-desc-fold[open] .funds-desc-toggle::before {
+  transform: rotate(90deg);
+}
 .funds-desc {
+  margin: 8px 0 0;
   color: color-mix(in srgb, var(--muted) 88%, var(--accent));
   letter-spacing: 0.02em;
+  line-height: 1.45;
+  font-size: 0.78rem;
 }
 .funds-live-pill {
   flex-shrink: 0;