🐛 | Improve test coverage for SonarQube quality gate

- Restructure conftest to try real Qt first, fall back to stubs
  only if that fails — ensures try/except guards in player.py and
  gui.py are exercised in CI, improving new_coverage
- Add tests for _migrate_legacy error paths (JSONDecodeError,
  OSError, db migration) — config.py now 100% covered
- Add tests for _disconnect, _send_presence exception handlers —
  discord_rpc.py now 97% covered
- Add tests for _cleanup_path and _tmp_dir helpers — player.py
  coverage bumped to 33%

tests/test_discord_rpc.py

@@ -174,3 +174,60 @@ class TestDiscordRPC:
         # Should not crash, just log a warning
         assert drpc._connected is False
         drpc.stop()
+
+    def test_disconnect_close_exception_handled(self):
+        """_disconnect handles close() failure gracefully (covers lines 128-129)."""
+        with mock.patch("discord_rpc.Presence") as mock_presence_cls:
+            mock_instance = mock.MagicMock()
+            mock_instance.close.side_effect = RuntimeError("close failed")
+            mock_presence_cls.return_value = mock_instance
+
+            from discord_rpc import DiscordRPC
+            drpc = DiscordRPC(client_id="test")
+            drpc._rpc = mock_instance
+            drpc._connected = True
+            drpc._disconnect()
+            assert drpc._connected is False
+            assert drpc._rpc is None
+
+    def test_send_presence_clear_exception_handled(self):
+        """_send_presence handles clear() failure gracefully (covers lines 142-143)."""
+        with mock.patch("discord_rpc.Presence") as mock_presence_cls:
+            mock_instance = mock.MagicMock()
+            mock_instance.clear.side_effect = RuntimeError("clear failed")
+            mock_presence_cls.return_value = mock_instance
+
+            from discord_rpc import DiscordRPC
+            drpc = DiscordRPC(client_id="test")
+            drpc._rpc = mock_instance
+            drpc._connected = True
+            drpc._song = None  # no song -> goes to clear branch
+            drpc._send_presence()
+            assert drpc._connected is False
+
+    def test_send_presence_update_exception_handled(self):
+        """_send_presence handles update() failure gracefully (covers lines 160-167)."""
+        with mock.patch("discord_rpc.Presence") as mock_presence_cls:
+            mock_instance = mock.MagicMock()
+            mock_instance.update.side_effect = RuntimeError("update failed")
+            mock_presence_cls.return_value = mock_instance
+
+            from discord_rpc import DiscordRPC
+            drpc = DiscordRPC(client_id="test")
+            drpc._rpc = mock_instance
+            drpc._connected = True
+            drpc._song = {"title": "Test", "artists": [{"name": "A"}], "duration": 100}
+            drpc._start_ts = 1000
+            drpc._send_presence()
+            assert drpc._connected is False
+
+    def test_send_presence_rpc_is_none(self):
+        """_send_presence does nothing when _rpc is None (covers line ~155)."""
+        from discord_rpc import DiscordRPC
+        drpc = DiscordRPC(client_id="test")
+        drpc._rpc = None
+        drpc._song = {"title": "Test"}
+        drpc._start_ts = 1000
+        # Should not crash
+        drpc._send_presence()
+        assert True