Increase default chart initial bar counts per timeframe.

Load 2000 bars for 1m/5m/15m, 1000 for 1h/2h/4h, and 500 for 1d/1w on first screen instead of 300-bar chunked defaults.

Co-authored-by: Cursor <cursoragent@cursor.com>

hub_ohlcv_lib.py

@@ -87,10 +87,12 @@ def aggregate_ratio(display_tf: str, source_tf: str) -> int:
 def chart_initial_limit(timeframe: str) -> int:
     tf = normalize_chart_timeframe(timeframe)
     if tf in SMALL_DISPLAY_TFS:
-        return 300
-    if tf == "1w":
-        return 150
-    return 200
+        return 2000
+    if tf in MID_DISPLAY_TFS:
+        return 1000
+    if tf in DAILY_PLUS_TIMEFRAMES:
+        return 500
+    return 500
 
 
 def chart_chunk_limit(timeframe: str) -> int: