test: expand browser command coverage

- Add mocked Click CLI tests across DOM, cookies, page, storage, perf, navigation, tabs, groups, sessions, and windows commands.
- Cover integration paths for cookies, page info, performance profiles, and web storage commands.
- Extend DOM integration coverage for eval, scrolling, waiting, focus, hover, typing, selection, keyboard, and checkbox interactions.
- Add native host unit coverage for message framing, socket helpers, paging guards, timeouts, and profile alias resolution.

tests/test_page.py

@@ -0,0 +1,39 @@
+"""Integration tests for page.info command — require a live browser."""
+
+def test_page_info_returns_required_fields(browser, http_tab):
+    """page.info returns title, url, readyState and lang."""
+    browser("tabs.active", {"tabId": http_tab["id"]})
+    info = browser("page.info")
+    assert isinstance(info, dict)
+    assert "title" in info
+    assert "url" in info
+    assert "readyState" in info
+    assert "lang" in info
+
+def test_page_info_url_matches_active_tab(browser, http_tab):
+    """URL reported by page.info matches the tab URL in tabs.list."""
+    browser("tabs.active", {"tabId": http_tab["id"]})
+    info = browser("page.info")
+    assert info is not None
+    # Active tab URL should match (allow for trailing slash difference)
+    assert "example.com" in info.get("url", "")
+
+def test_page_info_ready_state_complete(browser, http_tab):
+    """A fully loaded page reports readyState == 'complete'."""
+    browser("tabs.active", {"tabId": http_tab["id"]})
+    info = browser("page.info")
+    assert info.get("readyState") == "complete"
+
+def test_page_info_title_non_empty(browser, http_tab):
+    """example.com has a non-empty title."""
+    browser("tabs.active", {"tabId": http_tab["id"]})
+    info = browser("page.info")
+    assert isinstance(info.get("title"), str)
+    assert len(info["title"]) > 0
+
+def test_page_info_meta_is_dict(browser, http_tab):
+    """meta field is a dict (may be empty for simple pages)."""
+    browser("tabs.active", {"tabId": http_tab["id"]})
+    info = browser("page.info")
+    meta = info.get("meta")
+    assert meta is None or isinstance(meta, dict)