Dashboard: intraday equity sparkline + per-position R bars; sync stop_price

Two more visualizations + the bug building them exposed:
- Equity-curve sparkline in the P&L strip: query_equity_curve returns the day's
  total_equity series + prior-close baseline (dashed); rendered as an inline SVG
  (green/red vs baseline) so the day's P&L shape reads at a glance.
- Per-position R bar in Open Positions: shows current open profit/loss in R units
  (-1R = the stop, 0R = breakeven), green right / red left, with a per-row ⚠ when
  a position has no resting protective stop. Falls back to % when no stop known.
  Also fixed the P/L column to compute from entry/last (was reading a None field).
- BUG: sync_orders dropped stop_price (kept only limit_price), so the synced
  snapshot showed stop=None on real stop orders — breaking the R bar and spark
  stop-line. Now captured. (The naked alarm was unaffected — it counts qty
  coverage, not the level.)

Verified live: equity curve renders the -1,886 day (94,124 -> 92,238); R bars
render (fall back to % until the loop re-syncs stop_price). Tests pass.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

alpaca_paper/sync.py

@@ -132,6 +132,9 @@ class AlpacaPaperSync:
                 "type": o.get("type"),
                 "status": o.get("status"),
                 "limit_price": o.get("limit_price"),
+                # capture the stop trigger too — needed for the dashboard R bar /
+                # spark stop-line / any stop-level read (only limit_price was kept).
+                "stop_price": o.get("stop_price"),
                 "filled_avg_price": o.get("filled_avg_price"),
                 "submitted_at": o.get("submitted_at"),
             }