fix: preview() works without a running loop; set_cookie honors path when domain=None

preview()'s default cookie lookup reached the backend session and could force-
build it, raising RuntimeError('no running event loop') off-loop and defeating
the v0.1.7 lazy-session pre-loop use case; it's now skipped when the session
isn't built yet. set_cookie(domain=None) returned before setting the morsel's
path, so a shared cookie always stored path='/' regardless of the path= arg;
the morsel path is now set before that early return.

Signed-off-by: disqualifier <dev@disqualifier.me>

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "aioweb"
-version = "0.1.10"
+version = "0.1.11"
 description = "Async HTTP session wrapper over aiohttp — proxies, header overwrites, retries, previews. Config-free, installable."
 requires-python = ">=3.10"
 dependencies = [