Remove future annotations, add HTTPXTransport tests

Remove `from __future__ import annotations` from transports.py.
Add tests for HTTPXTransport covering both float and tuple
timeout branches to achieve 100% coverage.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: adamtheturtle

src/vws/transports.py

@@ -1,7 +1,5 @@
 """HTTP transport implementations for VWS clients."""
 
-from __future__ import annotations
-
 from typing import Protocol, runtime_checkable
 
 import httpx

tests/test_transports.py

@@ -0,0 +1,57 @@
+"""Tests for HTTP transport implementations."""
+
+from http import HTTPStatus
+
+import httpx
+import respx
+
+from vws.response import Response
+from vws.transports import HTTPXTransport
+
+
+class TestHTTPXTransport:
+    """Tests for ``HTTPXTransport``."""
+
+    @respx.mock
+    def test_float_timeout(self) -> None:
+        """``HTTPXTransport`` works with a float timeout."""
+        respx.post(url="https://example.com/test").mock(
+            return_value=httpx.Response(
+                status_code=HTTPStatus.OK,
+                text="OK",
+            ),
+        )
+        transport = HTTPXTransport()
+        response = transport(
+            method="POST",
+            url="https://example.com/test",
+            headers={"Content-Type": "text/plain"},
+            data=b"hello",
+            timeout=30.0,
+        )
+        assert isinstance(response, Response)
+        assert response.status_code == HTTPStatus.OK
+        assert response.text == "OK"
+        assert response.tell_position == 0
+
+    @respx.mock
+    def test_tuple_timeout(self) -> None:
+        """``HTTPXTransport`` works with a (connect, read) timeout
+        tuple.
+        """
+        respx.post(url="https://example.com/test").mock(
+            return_value=httpx.Response(
+                status_code=HTTPStatus.OK,
+                text="OK",
+            ),
+        )
+        transport = HTTPXTransport()
+        response = transport(
+            method="POST",
+            url="https://example.com/test",
+            headers={"Content-Type": "text/plain"},
+            data=b"hello",
+            timeout=(5.0, 30.0),
+        )
+        assert isinstance(response, Response)
+        assert response.status_code == HTTPStatus.OK