fix(remote): return session cache for device-code and cache-only logins

Answered login prompts and uploaded cache now count as client auth; the client closes on exit and keeps the remote session alive during long downloads.

tests/remote/unit/test_input_bridge.py

@@ -94,3 +94,16 @@ def test_status_setter() -> None:
     bridge = InputBridge()
     bridge.status = AuthStatus.AUTHENTICATED
     assert bridge.status is AuthStatus.AUTHENTICATED
+
+
+def test_answered_only_after_an_accepted_response() -> None:
+    bridge = InputBridge()
+    assert bridge.submit_response("early") is False
+    assert bridge.answered is False
+    worker = threading.Thread(target=bridge.request_input, args=("code?",))
+    worker.start()
+    while bridge.status != AuthStatus.PENDING_INPUT:
+        time.sleep(0.01)
+    assert bridge.submit_response("CODE") is True
+    worker.join(timeout=2)
+    assert bridge.answered is True