feat(DATA-004): add underlying instrument selector

app/pages/hedge.py

@@ -86,9 +86,10 @@ async def _resolve_hedge_spot(workspace_id: str | None = None) -> tuple[dict[str
 
     try:
         data_service = get_data_service()
-        quote = await data_service.get_quote(data_service.default_symbol)
+        underlying = config.underlying or "GLD"
+        quote = await data_service.get_quote(underlying)
         spot, source, updated_at = resolve_portfolio_spot_from_quote(
-            config, quote, fallback_symbol=data_service.default_symbol
+            config, quote, fallback_symbol=underlying
         )
         portfolio = portfolio_snapshot(config, runtime_spot_price=spot)
         return portfolio, source, updated_at
@@ -120,12 +121,25 @@ async def _render_hedge_page(workspace_id: str | None = None) -> None:
         )
     updated_label = f"Quote timestamp: {quote_updated_at}" if quote_updated_at else "Quote timestamp: unavailable"
 
+    # Get underlying for display
+    underlying = "GLD"
+    if workspace_id:
+        try:
+            repo = get_workspace_repository()
+            config = repo.load_portfolio_config(workspace_id)
+            underlying = config.underlying or "GLD"
+        except Exception:
+            pass
+
     with dashboard_page(
         "Hedge Analysis",
-        "Compare hedge structures across scenarios, visualize cost-benefit tradeoffs, and inspect net equity impacts.",
+        f"Compare hedge structures across scenarios, visualize cost-benefit tradeoffs, and inspect net equity impacts for {underlying}.",
         "hedge",
         workspace_id=workspace_id,
     ):
+        with ui.row().classes("w-full items-center justify-between gap-4 max-md:flex-col max-md:items-start"):
+            ui.label(f"Active underlying: {underlying}").classes("text-sm text-slate-500 dark:text-slate-400")
+
         left_pane, right_pane = split_page_panes(
             left_testid="hedge-left-pane",
             right_testid="hedge-right-pane",