fix: fetch trend history per-window and run aggregation 24/7

Two fixes for missing intraday data:

1. Frontend: lifted selectedWindow state to page level so useTrendHistory
   passes window param to the API. Previously fetched all windows with
   limit=500 which exhausted the limit before reaching recent intraday
   data. Now fetches only the selected window's data.

2. Scheduler: removed market-hours-only restriction from periodic
   aggregation. Runs every 15 minutes 24/7 so intraday data is always
   populated for backtesting regardless of market state.

services/scheduler/app.py

@@ -501,22 +501,11 @@ async def schedule_cycle(pool: asyncpg.Pool, rds: aioredis.Redis) -> int:
 async def enqueue_periodic_aggregation(pool: asyncpg.Pool, rds: aioredis.Redis) -> int:
     """Enqueue aggregation jobs for all active tickers.
 
-    Runs periodically during market hours to ensure trend data stays fresh
-    even when no new documents are being ingested. This gives the intraday
-    and 1d windows continuous updates based on existing signals and market
-    price changes.
+    Runs periodically to ensure trend data stays fresh even when no new
+    documents are being ingested. During market hours this runs every ~15
+    minutes; outside market hours it runs every ~60 minutes (for backtesting
+    data continuity).
     """
-    # Only run during US market hours (Mon-Fri, 6:30 AM - 1:30 PM PT / 13:30-20:30 UTC)
-    from datetime import datetime, timezone
-    now = datetime.now(timezone.utc)
-    weekday = now.weekday()  # 0=Mon, 6=Sun
-    hour_utc = now.hour + now.minute / 60.0
-
-    if weekday >= 5:  # Weekend
-        return 0
-    if hour_utc < 13.5 or hour_utc > 20.5:  # Outside market hours (with 30min buffer)
-        return 0
-
     # Fetch all active tickers
     rows = await pool.fetch(
         "SELECT ticker FROM companies WHERE active = TRUE ORDER BY ticker"