Remove 12h timeframe and stabilize chart wheel zoom.

Drop 12h from market chart options and storage, and avoid left-pan reload and tail refresh from resetting the viewport while zooming.

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

tests/test_hub_ohlcv_lib.py

@@ -167,37 +167,6 @@ class TestHubOhlcvLib(unittest.TestCase):
         self.assertGreaterEqual(len(ex.calls), 3)
         self.assertAlmostEqual(out["bars"][-1]["close"], 3.05)
 
-    def test_aggregate_12h_from_1h_when_exchange_lacks_native(self):
-        """无原生 12h 时应从 1h 聚合。"""
-        from hub_ohlcv_lib import TIMEFRAME_MS
-
-        h1 = TIMEFRAME_MS["1h"]
-        h12 = TIMEFRAME_MS["12h"]
-        base = (1_700_000_000_000 // h12) * h12
-        one_h = [
-            [base + i * h1, 100.0 + i, 101.0 + i, 99.0 + i, 100.5 + i, 10.0]
-            for i in range(48)
-        ]
-        ex = _FakeExchange(
-            [one_h],
-            timeframes={"1h": "1h", "4h": "4h"},
-        )
-        out = fetch_ohlcv_for_hub(
-            symbol="BTC/USDT",
-            timeframe="12h",
-            since_ms=base,
-            limit=4,
-            normalize_symbol_input=lambda s: str(s).strip().upper(),
-            normalize_exchange_symbol=lambda s: f"{s}:USDT" if ":" not in s else s,
-            ensure_markets_loaded=lambda: None,
-            exchange=ex,
-        )
-        self.assertTrue(out.get("ok"))
-        bars = out.get("bars") or []
-        self.assertEqual(len(bars), 4)
-        self.assertTrue(bars_spacing_matches_timeframe(bars, "12h"))
-        self.assertEqual(ex.calls[0]["timeframe"], "1h")
-
     def test_pagination_stops_when_next_since_reaches_now(self):
         """Gate 等：分页 since 不得越过当前时间，避免 from>to。"""
         from hub_ohlcv_lib import TIMEFRAME_MS
@@ -230,8 +199,8 @@ class TestHubOhlcvLib(unittest.TestCase):
         from hub_ohlcv_lib import TIMEFRAME_MS
 
         h1 = TIMEFRAME_MS["1h"]
-        h12 = TIMEFRAME_MS["12h"]
-        base = (1_700_000_000_000 // h12) * h12
+        h4 = TIMEFRAME_MS["4h"]
+        base = (1_700_000_000_000 // h4) * h4
         src = [
             {
                 "open_time_ms": base + i * h1,
@@ -241,11 +210,11 @@ class TestHubOhlcvLib(unittest.TestCase):
                 "close": 1.5,
                 "volume": 1.0,
             }
-            for i in range(12)
+            for i in range(4)
         ]
-        out = aggregate_ohlcv_bars(src, "12h")
+        out = aggregate_ohlcv_bars(src, "4h")
         self.assertEqual(len(out), 1)
-        self.assertEqual(out[0]["volume"], 12.0)
+        self.assertEqual(out[0]["volume"], 4.0)
         self.assertEqual(out[0]["high"], 2.0)
         self.assertEqual(out[0]["low"], 0.5)