feat: cockpit command center + skipped trades journal

Dashboard: insert 2 rows of 4 mini-cards between top row and trade ideas
- Row 1: PnL Simulé, Risque Simulé, Dernier Cycle, Régime Macro
- Row 2: Super Contexte, Signaux Géo, Meilleur Pattern, Patterns Actifs
- All cards link to underlying pages via react-router Link

Journal: add 'Non loggés' tab exposing trades suggested by cycle
but skipped because no risk profile was matched
- New skipped_trades table (auto-created on backend restart)
- log_trade_entries() persists each skip with score/gain/asset_class
- GET /api/journal/skipped-trades + useSkippedTrades hook

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/routers/journal.py

@@ -6,7 +6,7 @@ from services.database import (
     get_macro_regime_history, get_geo_alert_history, get_trade_entry_prices,
     get_closed_trades, close_trade, update_trade_exit_params,
     get_trade_entry_by_id, get_config, set_config, reset_journal_history,
-    _fetch_live_prices, _trade_maturity,
+    _fetch_live_prices, _trade_maturity, get_skipped_trades,
 )
 import json
 
@@ -253,6 +253,13 @@ def trade_check(body: TradeCheckRequest):
     return check_new_trade(body.underlying, body.strategy, body.asset_class)
 
 
+@router.get("/skipped-trades")
+def skipped_trades_endpoint(days: int = 30):
+    """Trades suggested by cycle that didn't pass any risk profile threshold."""
+    trades = get_skipped_trades(days)
+    return _sanitize({"trades": trades, "days": days, "count": len(trades)})
+
+
 @router.delete("/reset")
 def reset_journal():
     """Truncate all journal history (trades, macro, geo, cycles). Irreversible."""