fix: reconcile local positions against the live exchange book — stop lost PnL

Root cause of the dashboard under-reporting: any missed or unmatched fill
(position flip, sync gap, liquidation) left a 'zombie' OPEN row. Every later
close on that symbol landed as a partial close against the zombie, so the
row never reached CLOSED and its realized PnL never entered the closed-trade
statistics — Edge Profile, realized P/L, win rate, and the AI's own
track-record context all silently under-reported.

Fix: after each Hyperliquid order sync, reconcile local OPEN rows against the
exchange's live book (core perps + xyz dex), scoped by exchange account so
rows left by prior autopilot incarnations (each relaunch mints a fresh
trader_id sharing one exchange) are healed too. Rows the exchange no longer
holds are closed with their accumulated PnL; oversized rows are trimmed to
the live quantity. Live run confirmed: 9 zombie rows closed across
incarnations, book now matches the exchange exactly.

Also removes the header language switcher (desktop + mobile) and the
login/setup LanguageSwitcher — the product UI is English-only.

New store methods GetOpenPositionsByExchange + ReconcileOpenPositionsWithLive
with cross-incarnation test coverage.

store/position_reconcile_test.go

@@ -0,0 +1,113 @@
+package store
+
+import (
+	"testing"
+	"time"
+)
+
+func newReconcileTestStore(t *testing.T) *Store {
+	t.Helper()
+	st, err := New(t.TempDir() + "/nofx.db")
+	if err != nil {
+		t.Fatalf("store.New failed: %v", err)
+	}
+	t.Cleanup(func() { _ = st.Close() })
+	return st
+}
+
+func openRow(t *testing.T, st *Store, traderID, exchangeID, symbol, side string, qty, pnl float64, entryMs int64) int64 {
+	t.Helper()
+	pos := &TraderPosition{
+		TraderID:      traderID,
+		ExchangeID:    exchangeID,
+		ExchangeType:  "hyperliquid",
+		Symbol:        symbol,
+		Side:          side,
+		Quantity:      qty,
+		EntryQuantity: qty,
+		EntryPrice:    100,
+		EntryTime:     entryMs,
+		RealizedPnL:   pnl,
+		Status:        "OPEN",
+		Source:        "sync",
+		CreatedAt:     entryMs,
+		UpdatedAt:     entryMs,
+	}
+	if err := st.Position().CreateOpenPosition(pos); err != nil {
+		t.Fatalf("create open position: %v", err)
+	}
+	return pos.ID
+}
+
+func TestReconcileClosesZombiesKeepsLiveAndTrims(t *testing.T) {
+	st := newReconcileTestStore(t)
+	const exch = "ex-hl"
+	base := time.Now().Add(-48 * time.Hour).UnixMilli()
+
+	// Zombie under the CURRENT trader id: exchange holds nothing for DRAM.
+	zombieID := openRow(t, st, "trader-now", exch, "xyz:DRAM", "LONG", 6.8, -20.34, base)
+
+	// Zombie left by a PRIOR autopilot incarnation on the SAME exchange —
+	// this is the case a per-trader-id reconcile would miss.
+	legacyID := openRow(t, st, "trader-old", exch, "SOLUSDT", "SHORT", 6.94, -3.5, base+500)
+
+	// Duplicates for SP500 (different incarnations): newest survives trimmed,
+	// older closes.
+	oldSP := openRow(t, st, "trader-old", exch, "xyz:SP500", "LONG", 0.07, -1.5, base+1000)
+	newSP := openRow(t, st, "trader-now", exch, "xyz:SP500", "LONG", 0.124, 2.5, base+2000)
+
+	// Healthy row exactly matching live — untouched.
+	healthy := openRow(t, st, "trader-now", exch, "BTCUSDT", "LONG", 0.01, 0, base+3000)
+
+	// Row on a DIFFERENT exchange account — must be out of scope.
+	otherExch := openRow(t, st, "trader-now", "ex-other", "ETHUSDT", "LONG", 2.0, 0, base+4000)
+
+	live := map[string]float64{
+		LivePositionKey("xyz:SP500", "long"): 0.057,
+		LivePositionKey("BTCUSDT", "long"):   0.01,
+	}
+
+	closed, err := st.Position().ReconcileOpenPositionsWithLive(exch, live)
+	if err != nil {
+		t.Fatalf("reconcile failed: %v", err)
+	}
+	if closed != 3 {
+		t.Fatalf("expected 3 zombies closed (DRAM + legacy SOL + old SP500), got %d", closed)
+	}
+
+	get := func(id int64) *TraderPosition {
+		t.Helper()
+		var pos TraderPosition
+		if err := st.Position().db.First(&pos, id).Error; err != nil {
+			t.Fatalf("load position %d: %v", id, err)
+		}
+		return &pos
+	}
+
+	if dram := get(zombieID); dram.Status != "CLOSED" || dram.RealizedPnL != -20.34 || dram.CloseReason != "reconcile" {
+		t.Fatalf("DRAM zombie should close via reconcile keeping PnL, got %+v", dram)
+	}
+	if sol := get(legacyID); sol.Status != "CLOSED" {
+		t.Fatalf("legacy-incarnation SOL zombie on same exchange should close, got %+v", sol)
+	}
+	if sp := get(oldSP); sp.Status != "CLOSED" {
+		t.Fatalf("older duplicate SP500 row should close, got %+v", sp)
+	}
+	if sp := get(newSP); sp.Status != "OPEN" || sp.Quantity > 0.0571 || sp.Quantity < 0.0569 {
+		t.Fatalf("newest SP500 row should stay open trimmed to live 0.057, got status=%s qty=%v", sp.Status, sp.Quantity)
+	}
+	if btc := get(healthy); btc.Status != "OPEN" || btc.Quantity != 0.01 {
+		t.Fatalf("healthy row must be untouched, got %+v", btc)
+	}
+	if eth := get(otherExch); eth.Status != "OPEN" {
+		t.Fatalf("row on a different exchange must be out of scope, got %+v", eth)
+	}
+}
+
+func TestReconcileNoOpenRowsIsNoop(t *testing.T) {
+	st := newReconcileTestStore(t)
+	closed, err := st.Position().ReconcileOpenPositionsWithLive("ex-empty", map[string]float64{})
+	if err != nil || closed != 0 {
+		t.Fatalf("expected clean noop, got closed=%d err=%v", closed, err)
+	}
+}