Overview: focus|radar pairing, selectable radar, performance chart

Layout regrouped by relationship, not size: the setup-in-focus card
and the radar sit side by side (they are one decision surface), the
four account ribbons move directly above the open positions they
describe, and a new performance chart closes the page.

- Radar rows are selectable: clicking one swaps the focus card to that
  setup - including below-gate rows, whose card shows a muted
  "rank N / below gate" badge and the disqualify reason in the footer,
  with a "back to top pick" reset. The row currently in focus is
  highlighted; ticker links still deep-link without selecting.
- Performance chart (the mockup's missing piece): new
  GET /paper-trades/equity-curve computes, per benchmark trading day
  since the first paper trade, the book's cumulative P&L (realized +
  mark-to-market from stored OHLCV) vs the same cost basis riding SPY
  over each trade's window (benchmark_prices). Pure curve math in
  paper_trade_service with unit tests; hidden until there are 2+
  points of data. Frontend renders both lines with crosshair readout,
  zero baseline, and direct end labels.

Backend unit suite: 501 passed.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app/routers/paper_trades.py

@@ -54,6 +54,17 @@ async def read_exit_policy(
     return APIEnvelope(status="success", data=await paper_trade_service.get_exit_policy(db))
 
 
+@router.get("/paper-trades/equity-curve", response_model=APIEnvelope)
+async def paper_trade_equity_curve(
+    user: User = Depends(require_access),
+    db: AsyncSession = Depends(get_db),
+) -> APIEnvelope:
+    """Daily cumulative P&L of the paper book vs the same dollars riding SPY."""
+    return APIEnvelope(
+        status="success", data=await paper_trade_service.equity_curve(db, user.id)
+    )
+
+
 @router.put("/paper-trades/exit-policy", response_model=APIEnvelope)
 async def write_exit_policy(
     body: ExitPolicyUpdate,