Decode sigrok-iso7816-stream RST/VCC line events (GSMTAP 0x10/0x11)

Support the sigrok-iso7816-stream decoder (FX2 logic-analyzer passive
SIM sniffer, github.com/anttro/sigrok_iso7816_stream) which streams
GSMTAP-SIM on UDP 4729 and adds two custom sub-types for line events.

- gsmtap.py: GSMTAP_SIM_RST_EVENT (0x10) / GSMTAP_SIM_VCC_EVENT (0x11).
- capture.py: gsmtap_msg_type() maps 0x10→'rst', 0x11→'vcc' (shared by
  the listener and tests); pcap.py _SUB_TYPE_NAMES gains the same
  entries so PCAP re-imports of these captures preserve the events.
- decode.py: decode_line_event() decodes [direction, level, reserved]
  into reset asserted/de-asserted or power applied/removed + level;
  routed through decode_sniff_msg.
- database.py: reset-assert and power-removal invalidate the per-channel
  file selection (card-level transition); de-assert / power-on are
  markers only.
- frontend: RST/VCC labels (RESET ASSERTED / VCC OFF, …), a detail-view
  branch (Event + Level + raw), and list styling (.apdu-type.rst/.vcc).

README notes the custom sub-type compatibility. Tests: +8 (line-event
vectors, sniff routing, subtype + PCAP round-trip mappings) — 359
total. Version 1.21.0, SW cache simtrace-analyser-v31.

tests/test_decode.py

@@ -2307,5 +2307,44 @@ class TestClaDecode(unittest.TestCase):
         self.assertEqual(r['interclass'], 'ETSI-defined (SIM/GSM)')
 
 
+class TestLineEvents(unittest.TestCase):
+    """sigrok-iso7816-stream RST/VCC line events (GSMTAP 0x10/0x11)."""
+
+    def _dec(self, kind, payload):
+        from simtrace2_pysniff.server.decode import decode_line_event
+        return decode_line_event(bytes.fromhex(payload), kind)
+
+    def test_rst_asserted(self):
+        r = self._dec('rst', '010000')
+        self.assertEqual(r['type'], 'rst')
+        self.assertEqual(r['event'], 'reset asserted')
+        self.assertEqual(r['level'], 'low')
+
+    def test_rst_deasserted(self):
+        r = self._dec('rst', '000100')
+        self.assertEqual(r['event'], 'reset de-asserted')
+        self.assertEqual(r['level'], 'high')
+
+    def test_vcc_on(self):
+        r = self._dec('vcc', '010100')
+        self.assertEqual(r['event'], 'power applied')
+        self.assertEqual(r['level'], 'high')
+
+    def test_vcc_off(self):
+        r = self._dec('vcc', '000000')
+        self.assertEqual(r['event'], 'power removed')
+        self.assertEqual(r['level'], 'low')
+
+    def test_sniff_routing(self):
+        from simtrace2_pysniff.server.decode import decode_sniff_msg
+        self.assertEqual(decode_sniff_msg(b'\x01\x00\x00', 'rst')['type'], 'rst')
+        self.assertEqual(decode_sniff_msg(b'\x00\x01\x00', 'vcc')['type'], 'vcc')
+
+    def test_short_payload(self):
+        r = self._dec('rst', '01')
+        self.assertEqual(r['type'], 'rst')
+        self.assertNotIn('event', r)
+
+
 if __name__ == '__main__':
     unittest.main()